A datatype to hold a frame number. A #GESAsset in the GStreamer Editing Services represents a resources that can be used. In particular, any class that implements the #GESExtractable interface may have some associated assets with a corresponding #GESAsset:extractable-type, from which its objects can be extracted using ges_asset_extract(). Some examples would be #GESClip, #GESFormatter and #GESTrackElement. All assets that are created within GES are stored in a cache; one per each #GESAsset:id and #GESAsset:extractable-type pair. These assets can be fetched, and initialized if they do not yet exist in the cache, using ges_asset_request(). ``` c GESAsset *effect_asset; GESEffect *effect; // You create an asset for an effect effect_asset = ges_asset_request (GES_TYPE_EFFECT, "agingtv", NULL); // And now you can extract an instance of GESEffect from that asset effect = GES_EFFECT (ges_asset_extract (effect_asset)); ``` The advantage of using assets, rather than simply creating the object directly, is that the currently loaded resources can be listed with ges_list_assets() and displayed to an end user. For example, to show which media files have been loaded, and a standard list of effects. In fact, the GES library already creates assets for #GESTransitionClip and #GESFormatter, which you can use to list all the available transition types and supported formats. The other advantage is that #GESAsset implements #GESMetaContainer, so metadata can be set on the asset, with some subclasses automatically creating this metadata on initiation. For example, to display information about the supported formats, you could do the following: |[ GList *formatter_assets, *tmp; // List all the transitions formatter_assets = ges_list_assets (GES_TYPE_FORMATTER); // Print some infos about the formatter GESAsset for (tmp = formatter_assets; tmp; tmp = tmp->next) { g_print ("Name of the formatter: %s, file extension it produces: %s", ges_meta_container_get_string ( GES_META_CONTAINER (tmp->data), GES_META_FORMATTER_NAME), ges_meta_container_get_string ( GES_META_CONTAINER (tmp->data), GES_META_FORMATTER_EXTENSION)); } g_list_free (transition_assets); ]| ## ID Each asset is uniquely defined in the cache by its #GESAsset:extractable-type and #GESAsset:id. Depending on the #GESAsset:extractable-type, the #GESAsset:id can be used to parametrise the creation of the object upon extraction. By default, a class that implements #GESExtractable will only have a single associated asset, with an #GESAsset:id set to the type name of its objects. However, this is overwritten by some implementations, which allow a class to have multiple associated assets. For example, for #GESTransitionClip the #GESAsset:id will be a nickname of the #GESTransitionClip:vtype. You should check the documentation for each extractable type to see if they differ from the default. Moreover, each #GESAsset:extractable-type may also associate itself with a specific asset subclass. In such cases, when their asset is requested, an asset of this subclass will be returned instead. ## Managing You can use a #GESProject to easily manage the assets of a #GESTimeline. ## Proxies Some assets can (temporarily) act as the #GESAsset:proxy of another asset. When the original asset is requested from the cache, the proxy will be returned in its place. This can be useful if, say, you want to substitute a #GESUriClipAsset corresponding to a high resolution media file with the asset of a lower resolution stand in. An asset may even have several proxies, the first of which will act as its default and be returned on requests, but the others will be ordered to take its place once it is removed. You can add a proxy to an asset, or set its default, using ges_asset_set_proxy(), and you can remove them with ges_asset_unproxy(). Indicate that an existing #GESAsset in the cache should be reloaded upon the next request. This can be used when some condition has changed, which may require that an existing asset should be updated. For example, if an external resource has changed or now become available. Note, the asset is not immediately changed, but will only actually reload on the next call to ges_asset_request() or ges_asset_request_async(). %TRUE if the specified asset exists in the cache and could be marked for reloading. The #GESAsset:extractable-type of the asset that needs reloading The #GESAsset:id of the asset asset that needs reloading Returns an asset with the given properties. If such an asset already exists in the cache (it has been previously created in GES), then a reference to the existing asset is returned. Otherwise, a newly created asset is returned, and also added to the cache. If the requested asset has been loaded with an error, then @error is set, if given, and %NULL will be returned instead. Note that the given @id may not be exactly the #GESAsset:id that is set on the returned asset. For instance, it may be adjusted into a standard format. Or, if a #GESExtractable type does not have its extraction parametrised, as is the case by default, then the given @id may be ignored entirely and the #GESAsset:id set to some standard, in which case a %NULL @id can be given. Similarly, the given @extractable_type may not be exactly the #GESAsset:extractable-type that is set on the returned asset. Instead, the actual extractable type may correspond to a subclass of the given @extractable_type, depending on the given @id. Moreover, depending on the given @extractable_type, the returned asset may belong to a subclass of #GESAsset. Finally, if the requested asset has a #GESAsset:proxy, then the proxy that is found at the end of the chain of proxies is returned (a proxy's proxy will take its place, and so on, unless it has no proxy). Some asset subclasses only support asynchronous construction of its assets, such as #GESUriClip. For such assets this method will fail, and you should use ges_asset_request_async() instead. In the case of #GESUriClip, you can use ges_uri_clip_asset_request_sync() if you only want to wait for the request to finish. A reference to the requested asset, or %NULL if an error occurred. The #GESAsset:extractable-type of the asset The #GESAsset:id of the asset Requests an asset with the given properties asynchronously (see ges_asset_request()). When the asset has been initialized or fetched from the cache, the given callback function will be called. The asset can then be retrieved in the callback using the ges_asset_request_finish() method on the given #GAsyncResult. Note that the source object passed to the callback will be the #GESAsset corresponding to the request, but it may not have loaded correctly and therefore can not be used as is. Instead, ges_asset_request_finish() should be used to fetch a usable asset, or indicate that an error occurred in the asset's creation. Note that the callback will be called in the #GMainLoop running under the same #GMainContext that ges_init() was called in. So, if you wish the callback to be invoked outside the default #GMainContext, you can call g_main_context_push_thread_default() in a new thread before calling ges_init(). Example of an asynchronous asset request: ``` c // The request callback static void asset_loaded_cb (GESAsset * source, GAsyncResult * res, gpointer user_data) { GESAsset *asset; GError *error = NULL; asset = ges_asset_request_finish (res, &error); if (asset) { g_print ("The file: %s is usable as a GESUriClip", ges_asset_get_id (asset)); } else { g_print ("The file: %s is *not* usable as a GESUriClip because: %s", ges_asset_get_id (source), error->message); } gst_object_unref (asset); } // The request: ges_asset_request_async (GES_TYPE_URI_CLIP, some_uri, NULL, (GAsyncReadyCallback) asset_loaded_cb, user_data); ``` The #GESAsset:extractable-type of the asset The #GESAsset:id of the asset An object to allow cancellation of the asset request, or %NULL to ignore A function to call when the initialization is finished Data to be passed to @callback Fetches an asset requested by ges_asset_request_async(), which finalises the request. The requested asset, or %NULL if an error occurred. The task result to fetch the asset from Extracts a new #GESAsset:extractable-type object from the asset. The #GESAsset:id of the asset may determine the properties and state of the newly created object. A newly created object, or %NULL if an error occurred. The #GESAsset to extract an object from Extracts a new #GESAsset:extractable-type object from the asset. The #GESAsset:id of the asset may determine the properties and state of the newly created object. A newly created object, or %NULL if an error occurred. The #GESAsset to extract an object from Retrieve the error that was set on the asset when it was loaded. The error set on @asset, or %NULL if no error occurred when @asset was loaded. A #GESAsset Gets the #GESAsset:extractable-type of the asset. The extractable type of @self. The #GESAsset Gets the #GESAsset:id of the asset. The ID of @self. A #GESAsset Gets the default #GESAsset:proxy of the asset. The default proxy of @asset. A #GESAsset Gets the #GESAsset:proxy-target of the asset. Note that the proxy target may have loaded with an error, so you should call ges_asset_get_error() on the returned target. The asset that @proxy is a proxy of. A #GESAsset Get all the proxies that the asset has. The first item of the list will be the default #GESAsset:proxy. The second will be the proxy that is 'next in line' to be default, and so on. The list of proxies that @asset has. A #GESAsset Sets the #GESAsset:proxy for the asset. If @proxy is among the existing proxies of the asset (see ges_asset_list_proxies()) it will be moved to become the default proxy. Otherwise, if @proxy is not %NULL, it will be added to the list of proxies, as the new default. The previous default proxy will become 'next in line' for if the new one is removed, and so on. As such, this will **not** actually remove the previous default proxy (use ges_asset_unproxy() for that). Note that an asset can only act as a proxy for one other asset. As a special case, if @proxy is %NULL, then this method will actually remove **all** proxies from the asset. %TRUE if @proxy was successfully set as the default for @asset. The #GESAsset to proxy A new default proxy for @asset Removes the proxy from the available list of proxies for the asset. If the given proxy is the default proxy of the list, then the next proxy in the available list (see ges_asset_list_proxies()) will become the default. If there are no other proxies, then the asset will no longer have a default #GESAsset:proxy. %TRUE if @proxy was successfully removed from @asset's proxy list. The #GESAsset to no longer proxy with @proxy An existing proxy of @asset The #GESExtractable object type that can be extracted from the asset. The ID of the asset. This should be unique amongst all assets with the same #GESAsset:extractable-type. Depending on the associated #GESExtractable implementation, this id may convey some information about the #GObject that should be extracted. Note that, as such, the ID will have an expected format, and you can not choose this value arbitrarily. By default, this will be set to the type name of the #GESAsset:extractable-type, but you should check the documentation of the extractable type to see whether they differ from the default behaviour. The default proxy for this asset, or %NULL if it has no proxy. A proxy will act as a substitute for the original asset when the original is requested (see ges_asset_request()). Setting this property will not usually remove the existing proxy, but will replace it as the default (see ges_asset_set_proxy()). The asset that this asset is a proxy for, or %NULL if it is not a proxy for another asset. Note that even if this asset is acting as a proxy for another asset, but this asset is not the default #GESAsset:proxy, then @proxy-target will *still* point to this other asset. So you should check the #GESAsset:proxy property of @target-proxy before assuming it is the current default proxy for the target. Note that the #GObject::notify for this property is emitted after the #GESAsset:proxy #GObject::notify for the corresponding (if any) asset it is now the proxy of/no longer the proxy of. A newly created object, or %NULL if an error occurred. The #GESAsset to extract an object from Indicates that an error occurred Indicates that the loading is being performed asynchronously Indicates that the loading is complete, without error ## Children Properties You can use the following children properties through the #ges_track_element_set_child_property and alike set of methods: - #gdouble `volume`: volume factor, 1.0=100%. - #gboolean `mute`: mute channel. Outputs a test audio stream using audiotestsrc. The default property values output silence. Useful for testing pipelines, or to fill gaps in an audio track. Get the current frequency of @self. The current frequency of @self. a #GESAudioTestSource Get the current volume of @self. The current volume of @self a #GESAudioTestSource Lets you set the frequency applied on the track element a #GESAudioTestSource The frequency you want to apply on @self Sets the volume of the test audio signal. a #GESAudioTestSource The volume you want to apply on @self A #GESAudioTrack is a default audio #GESTrack, with a #GES_TRACK_TYPE_AUDIO #GESTrack:track-type and "audio/x-raw(ANY)" #GESTrack:caps. By default, an audio track will have its #GESTrack:restriction-caps set to "audio/x-raw" with the following properties: - format: "S32LE" - channels: 2 - rate: 44100 - layout: "interleaved" These fields are needed for negotiation purposes, but you can change their values if you wish. It is advised that you do so using ges_track_update_restriction_caps() with new values for the fields you wish to change, and any additional fields you may want to add. Unlike using ges_track_set_restriction_caps(), this will ensure that these default fields will at least have some value set. Creates a new audio track, with a #GES_TRACK_TYPE_AUDIO #GESTrack:track-type, "audio/x-raw(ANY)" #GESTrack:caps, and "audio/x-raw" #GESTrack:restriction-caps with the properties: - format: "S32LE" - channels: 2 - rate: 44100 - layout: "interleaved" You should use ges_track_update_restriction_caps() if you wish to modify these fields, or add additional ones. The newly created audio track. Creates a new #GESAudioTransition. This should never be called by applications as this will be created by clips. The newly created #GESAudioTransition. ### Children Properties {{ libs/GESVideoUriSource-children-props.md }} The location of the file/resource to use. A #GESBaseEffect is some operation that applies an effect to the data it receives. ## Time Effects Some operations will change the timing of the stream data they receive in some way. In particular, the #GstElement that they wrap could alter the times of the segment they receive in a #GST_EVENT_SEGMENT event, or the times of a seek they receive in a #GST_EVENT_SEEK event. Such operations would be considered time effects since they translate the times they receive on their source to different times at their sink, and vis versa. This introduces two sets of time coordinates for the event: (internal) sink coordinates and (internal) source coordinates, where segment times are translated from the sink coordinates to the source coordinates, and seek times are translated from the source coordinates to the sink coordinates. If you use such an effect in GES, you will need to inform GES of the properties that control the timing with ges_base_effect_register_time_property(), and the effect's timing behaviour using ges_base_effect_set_time_translation_funcs(). Note that a time effect should not have its #GESTrackElement:has-internal-source set to %TRUE. In addition, note that GES only *fully* supports time effects whose mapping from the source to sink coordinates (those applied to seeks) obeys: + Maps the time `0` to `0`. So initial time-shifting effects are excluded. + Is monotonically increasing. So reversing effects, and effects that jump backwards in the stream are excluded. + Can handle a reasonable #GstClockTime, relative to the project. So this would exclude a time effect with an extremely large speed-up that would cause the converted #GstClockTime seeks to overflow. + Is 'continuously reversible'. This essentially means that for every time in the sink coordinates, we can, to 'good enough' accuracy, calculate the corresponding time in the source coordinates. Moreover, this should correspond to how segment times are translated from sink to source. + Only depends on the registered time properties, rather than the state of the #GstElement or the data it receives. This would exclude, say, an effect that would speedup if there is more red in the image it receives. Note that a constant-rate-change effect that is not extremely fast or slow would satisfy these conditions. For such effects, you may wish to use ges_effect_class_register_rate_property(). Get whether the effect is considered a time effect or not. An effect with registered time properties or set translation functions is considered a time effect. %TRUE if @effect is considered a time effect. A #GESBaseEffect Register a child property of the effect as a property that, when set, can change the timing of its input data. The child property should be specified as in ges_timeline_element_lookup_child(). You should also set the corresponding time translation using ges_base_effect_set_time_translation_funcs(). Note that @effect must not be part of a clip, nor can it have #GESTrackElement:has-internal-source set to %TRUE. %TRUE if the child property was found and newly registered. A #GESBaseEffect The name of the child property to register as a time property Set the time translation query functions for the time effect. If an effect is a time effect, it will have two sets of coordinates: one at its sink and one at its source. The given functions should be able to translate between these two sets of coordinates. More specifically, @source_to_sink_func should *emulate* how the corresponding #GstElement would translate the #GstSegment @time field, and @sink_to_source_func should emulate how the corresponding #GstElement would translate the seek query @start and @stop values, as used in gst_element_seek(). As such, @sink_to_source_func should act as an approximate reverse of @source_to_sink_func. Note, these functions will be passed a table of time properties, as registered in ges_base_effect_register_time_property(), and their values. The functions should emulate what the translation *would* be *if* the time properties were set to the given values. They should not use the currently set values. Note that @effect must not be part of a clip, nor can it have #GESTrackElement:has-internal-source set to %TRUE. %TRUE if the translation functions were set. A #GESBaseEffect The function to use for querying how a time is translated from the source coordinates to the sink coordinates of @effect The function to use for querying how a time is translated from the sink coordinates to the source coordinates of @effect Data to pass to both @source_to_sink_func and @sink_to_source_func Method to call to destroy @user_data, or %NULL parent class #GESBaseEffectClip-s are clips whose core elements are #GESBaseEffect-s. ## Effects #GESBaseEffectClip-s can have **additional** #GESBaseEffect-s added as non-core elements. These additional effects are applied to the output of the core effects of the clip that they share a #GESTrack with. See #GESClip for how to add and move these effects from the clip. Note that you cannot add time effects to #GESBaseEffectClip, neither as core children, nor as additional effects. A function for querying how an effect would translate a time if it had the given child property values set. The keys for @time_properties will be the same string that was passed to ges_base_effect_register_time_property(), the values will be #GValue* values of the corresponding child properties. You should always use the values given in @time_properties before using the currently set values. The translated time. The #GESBaseEffect that is doing the time translation The #GstClockTime to translation A table of child property name/value pairs Data passed to ges_base_effect_set_time_translation_funcs() Whether the class allows for the user to add additional non-core #GESBaseEffect-s to clips from this class. A #GESClipClass The #GList containing the children of @obj. a #GESContainer The #GESContainer:height of @obj. a #GESContainer To be used by subclasses only. This indicate how to handle a change in a child. #GESClip-s are the core objects of a #GESLayer. Each clip may exist in a single layer but may control several #GESTrackElement-s that span several #GESTrack-s. A clip will ensure that all its children share the same #GESTimelineElement:start and #GESTimelineElement:duration in their tracks, which will match the #GESTimelineElement:start and #GESTimelineElement:duration of the clip itself. Therefore, changing the timing of the clip will change the timing of the children, and a change in the timing of a child will change the timing of the clip and subsequently all its siblings. As such, a clip can be treated as a singular object in its layer. For most uses of a #GESTimeline, it is often sufficient to only interact with #GESClip-s directly, which will take care of creating and organising the elements of the timeline's tracks. ## Core Children In more detail, clips will usually have some *core* #GESTrackElement children, which are created by the clip when it is added to a layer in a timeline. The type and form of these core children will depend on the clip's subclass. You can use ges_track_element_is_core() to determine whether a track element is considered such a core track element. Note, if a core track element is part of a clip, it will always be treated as a core *child* of the clip. You can connect to the #GESContainer::child-added signal to be notified of their creation. When a child is added to a clip, the timeline will select its tracks using #GESTimeline::select-tracks-for-object. Note that it may be the case that the child will still have no set #GESTrackElement:track after this process. For example, if the timeline does not have a track of the corresponding #GESTrack:track-type. A clip can safely contain such children, which may have their track set later, although they will play no functioning role in the timeline in the meantime. If a clip may create track elements with various #GESTrackElement:track-type(s), such as a #GESUriClip, but you only want it to create a subset of these types, you should set the #GESClip:supported-formats of the clip to the subset of types. This should be done *before* adding the clip to a layer. If a clip will produce several core elements of the same #GESTrackElement:track-type, you should connect to the timeline's #GESTimeline::select-tracks-for-object signal to coordinate which tracks each element should land in. Note, no two core children within a clip can share the same #GESTrack, so you should not select the same track for two separate core children. Provided you stick to this rule, it is still safe to select several tracks for the same core child, the core child will be copied into the additional tracks. You can manually add the child to more tracks later using ges_clip_add_child_to_track(). If you do not wish to use a core child, you can always select no track. The #GESTimelineElement:in-point of the clip will control the #GESTimelineElement:in-point of its core children to be the same value if their #GESTrackElement:has-internal-source is set to %TRUE. The #GESTimelineElement:max-duration of the clip is the minimum #GESTimelineElement:max-duration of its core children. If you set its value to anything other than its current value, this will also set the #GESTimelineElement:max-duration of all its core children to the same value if their #GESTrackElement:has-internal-source is set to %TRUE. As a special case, whilst a clip does not yet have any core children, its #GESTimelineElement:max-duration may be set to indicate what its value will be once they are created. ## Effects Some subclasses (#GESSourceClip and #GESBaseEffectClip) may also allow their objects to have additional non-core #GESBaseEffect-s elements as children. These are additional effects that are applied to the output data of the core elements. They can be added to the clip using ges_clip_add_top_effect(), which will take care of adding the effect to the timeline's tracks. The new effect will be placed between the clip's core track elements and its other effects. As such, the newly added effect will be applied to any source data **before** the other existing effects. You can change the ordering of effects using ges_clip_set_top_effect_index(). Tracks are selected for top effects in the same way as core children. If you add a top effect to a clip before it is part of a timeline, and later add the clip to a timeline, the track selection for the top effects will occur just after the track selection for the core children. If you add a top effect to a clip that is already part of a timeline, the track selection will occur immediately. Since a top effect must be applied on top of a core child, if you use #GESTimeline::select-tracks-for-object, you should ensure that the added effects are destined for a #GESTrack that already contains a core child. In addition, if the core child in the track is not #GESTrackElement:active, then neither can any of its effects be #GESTrackElement:active. Therefore, if a core child is made in-active, all of the additional effects in the same track will also become in-active. Similarly, if an effect is set to be active, then the core child will also become active, but other effects will be left alone. Finally, if an active effect is added to the track of an in-active core child, it will become in-active as well. Note, in contrast, setting a core child to be active, or an effect to be in-active will *not* change the other children in the same track. ### Time Effects Some effects also change the timing of their data (see #GESBaseEffect for what counts as a time effect). Note that a #GESBaseEffectClip will refuse time effects, but a #GESSource will allow them. When added to a clip, time effects may adjust the timing of other children in the same track. Similarly, when changing the order of effects, making them (in)-active, setting their time property values or removing time effects. These can cause the #GESClip:duration-limit to change in value. However, if such an operation would ever cause the #GESTimelineElement:duration to shrink such that a clip's #GESSource is totally overlapped in the timeline, the operation would be prevented. Note that the same can happen when adding non-time effects with a finite #GESTimelineElement:max-duration. Therefore, when working with time effects, you should -- more so than usual -- not assume that setting the properties of the clip's children will succeed. In particular, you should use ges_timeline_element_set_child_property_full() when setting the time properties. If you wish to preserve the *internal* duration of a source in a clip during these time effect operations, you can do something like the following. ```c void do_time_effect_change (GESClip * clip) { GList *tmp, *children; GESTrackElement *source; GstClockTime source_outpoint; GstClockTime new_end; GError *error = NULL; // choose some active source in a track to preserve the internal // duration of source = ges_clip_get_track_element (clip, NULL, GES_TYPE_SOURCE); // note its current internal end time source_outpoint = ges_clip_get_internal_time_from_timeline_time ( clip, source, GES_TIMELINE_ELEMENT_END (clip), NULL); // handle invalid out-point // stop the children's control sources from clamping when their // out-point changes with a change in the time effects children = ges_container_get_children (GES_CONTAINER (clip), FALSE); for (tmp = children; tmp; tmp = tmp->next) ges_track_element_set_auto_clamp_control_source (tmp->data, FALSE); // add time effect, or set their children properties, or move them around ... // user can make sure that if a time effect changes one source, we should // also change the time effect for another source. E.g. if // "GstVideorate::rate" is set to 2.0, we also set "GstPitch::rate" to // 2.0 // Note the duration of the clip may have already changed if the // duration-limit of the clip dropped below its current value new_end = ges_clip_get_timeline_time_from_internal_time ( clip, source, source_outpoint, &error); // handle error if (!ges_timeline_elemnet_edit_full (GES_TIMELINE_ELEMENT (clip), -1, GES_EDIT_MODE_TRIM, GES_EDGE_END, new_end, &error)) // handle error for (tmp = children; tmp; tmp = tmp->next) ges_track_element_set_auto_clamp_control_source (tmp->data, TRUE); g_list_free_full (children, gst_object_unref); gst_object_unref (source); } ``` The #GESTrackElement created by @clip, or %NULL if @clip can not provide a track element for the given @type or an error occurred. A #GESClip A #GESTrackType to create a #GESTrackElement for A list of the #GESTrackElement-s created by @clip for the given @type, or %NULL if no track elements are created or an error occurred. A #GESClip A #GESTrackType to create #GESTrackElement-s for Extracts a #GESTrackElement from an asset and adds it to the clip. This can be used to add effects that derive from the asset to the clip, but this method is not intended to be used to create the core elements of the clip. The newly created element, or %NULL if an error occurred. A #GESClip An asset with #GES_TYPE_TRACK_ELEMENT as its #GESAsset:extractable-type Adds the track element child of the clip to a specific track. If the given child is already in another track, this will create a copy of the child, add it to the clip, and add this copy to the track. You should only call this whilst a clip is part of a #GESTimeline, and for tracks that are in the same timeline. This method is an alternative to using the #GESTimeline::select-tracks-for-object signal, but can be used to complement it when, say, you wish to copy a clip's children from one track into a new one. When the child is a core child, it must be added to a track that does not already contain another core child of the same clip. If it is not a core child (an additional effect), then it must be added to a track that already contains one of the core children of the same clip. This method can also fail if the adding the track element to the track would break a configuration rule of the corresponding #GESTimeline, such as causing three sources to overlap at a single time, or causing a source to completely overlap another in the same track. The element that was added to @track, either @child or a copy of child, or %NULL if the element could not be added. A #GESClip A child of @clip The track to add @child to Add a top effect to a clip at the given index. Unlike using ges_container_add(), this allows you to set the index in advance. It will also check that no error occurred during the track selection for the effect. Note, only subclasses of #GESClipClass that have #GES_CLIP_CLASS_CAN_ADD_EFFECTS set to %TRUE (such as #GESSourceClip and #GESBaseEffectClip) can have additional top effects added. Note, if the effect is a time effect, this may be refused if the clip would not be able to adapt itself once the effect is added. %TRUE if @effect was successfully added to @clip at @index. A #GESClip A top effect to add The index to add @effect at, or -1 to add at the highest Finds an element controlled by the clip. If @track is given, then only the track elements in @track are searched for. If @type is given, then this function searches for a track element of the given @type. Note, if multiple track elements in the clip match the given criteria, this will return the element amongst them with the highest #GESTimelineElement:priority (numerically, the smallest). See ges_clip_find_track_elements() if you wish to find all such elements. The element controlled by @clip, in @track, and of the given @type, or %NULL if no such element could be found. A #GESClip The track to search in, or %NULL to search in all tracks The type of track element to search for, or `G_TYPE_NONE` to match any type Finds the #GESTrackElement-s controlled by the clip that match the given criteria. If @track is given as %NULL and @track_type is given as #GES_TRACK_TYPE_UNKNOWN, then the search will match all elements in any track, including those with no track, and of any #GESTrackElement:track-type. Otherwise, if @track is not %NULL, but @track_type is #GES_TRACK_TYPE_UNKNOWN, then only the track elements in @track are searched for. Otherwise, if @track_type is not #GES_TRACK_TYPE_UNKNOWN, but @track is %NULL, then only the track elements whose #GESTrackElement:track-type matches @track_type are searched for. Otherwise, when both are given, the track elements that match **either** criteria are searched for. Therefore, if you wish to only find elements in a specific track, you should give the track as @track, but you should not give the track's #GESTrack:track-type as @track_type because this would also select elements from other tracks of the same type. You may also give @type to _further_ restrict the search to track elements of the given @type. A list of all the #GESTrackElement-s controlled by @clip, in @track or of the given @track_type, and of the given @type. A #GESClip The track to search in, or %NULL to search in all tracks The track-type of the track element to search for, or #GES_TRACK_TYPE_UNKNOWN to match any track type The type of track element to search for, or %G_TYPE_NONE to match any type Gets the #GESClip:duration-limit of the clip. The duration-limit of @clip. A #GESClip Convert the timeline time to an internal source time of the child. This will take any time effects placed on the clip into account (see #GESBaseEffect for what time effects are supported, and how to declare them in GES). When @timeline_time is above the #GESTimelineElement:start of @clip, this will return the internal time at which the content that appears at @timeline_time in the output of the timeline is created in @child. For example, if @timeline_time corresponds to the current seek position, this would let you know which part of a media file is being read. This will be done assuming the clip has an indefinite end, so the internal time may be beyond the current out-point of the child, or even its #GESTimelineElement:max-duration. If, instead, @timeline_time is below the current #GESTimelineElement:start of @clip, this will return what you would need to set the #GESTimelineElement:in-point of @child to if you set the #GESTimelineElement:start of @clip to @timeline_time and wanted to keep the content of @child currently found at the current #GESTimelineElement:start of @clip at the same timeline position. If this would be negative, the conversion fails. This is useful for determining what #GESTimelineElement:in-point would result from a #GES_EDIT_MODE_TRIM to @timeline_time. Note that whilst a clip has no time effects, this second return is equivalent to finding the internal time at which the content that appears at @timeline_time in the timeline can be found in @child if it had indefinite extent in both directions. However, with non-linear time effects this second return will be more distinct. In either case, the returned time would be appropriate to use for the #GESTimelineElement:in-point or #GESTimelineElement:max-duration of the child. See ges_clip_get_timeline_time_from_internal_time(), which performs the reverse. The time in the internal coordinates of @child corresponding to @timeline_time, or #GST_CLOCK_TIME_NONE if the conversion could not be performed. A #GESClip An #GESTrackElement:active child of @clip with a #GESTrackElement:track A time in the timeline time coordinates Gets the #GESClip:layer of the clip. The layer @clip is in, or %NULL if @clip is not in any layer. A #GESClip Gets the #GESClip:supported-formats of the clip. The #GESTrackType-s supported by @clip. A #GESClip Convert the internal source time from the child to a timeline time. This will take any time effects placed on the clip into account (see #GESBaseEffect for what time effects are supported, and how to declare them in GES). When @internal_time is above the #GESTimelineElement:in-point of @child, this will return the timeline time at which the internal content found at @internal_time appears in the output of the timeline's track. For example, this would let you know where in the timeline a particular scene in a media file would appear. This will be done assuming the clip has an indefinite end, so the timeline time may be beyond the end of the clip, or even breaking its #GESClip:duration-limit. If, instead, @internal_time is below the current #GESTimelineElement:in-point of @child, this will return what you would need to set the #GESTimelineElement:start of @clip to if you set the #GESTimelineElement:in-point of @child to @internal_time and wanted to keep the content of @child currently found at the current #GESTimelineElement:start of @clip at the same timeline position. If this would be negative, the conversion fails. This is useful for determining what position to use in a #GES_EDIT_MODE_TRIM if you wish to trim to a specific point in the internal content, such as a particular scene in a media file. Note that whilst a clip has no time effects, this second return is equivalent to finding the timeline time at which the content of @child at @internal_time would be found in the timeline if it had indefinite extent in both directions. However, with non-linear time effects this second return will be more distinct. In either case, the returned time would be appropriate to use in ges_timeline_element_edit() for #GES_EDIT_MODE_TRIM, and similar, if you wish to use a particular internal point as a reference. For example, you could choose to end a clip at a certain internal 'out-point', similar to the #GESTimelineElement:in-point, by translating the desired end time into the timeline coordinates, and using this position to trim the end of a clip. See ges_clip_get_internal_time_from_timeline_time(), which performs the reverse, or ges_clip_get_timeline_time_from_source_frame() which does the same conversion, but using frame numbers. The time in the timeline coordinates corresponding to @internal_time, or #GST_CLOCK_TIME_NONE if the conversion could not be performed. A #GESClip An #GESTrackElement:active child of @clip with a #GESTrackElement:track A time in the internal time coordinates of @child Convert the source frame number to a timeline time. This acts the same as ges_clip_get_timeline_time_from_internal_time() using the core children of the clip and using the frame number to specify the internal position, rather than a timestamp. The returned timeline time can be used to seek or edit to a specific frame. Note that you can get the frame timestamp of a particular clip asset with ges_clip_asset_get_frame_time(). The timestamp corresponding to @frame_number in the core children of @clip, in the timeline coordinates, or #GST_CLOCK_TIME_NONE if the conversion could not be performed. A #GESClip The frame number to get the corresponding timestamp of in the timeline coordinates Gets the internal index of an effect in the clip. The index of effects in a clip will run from 0 to n-1, where n is the total number of effects. If two effects share the same #GESTrackElement:track, the effect with the numerically lower index will be applied to the source data **after** the other effect, i.e. output data will always flow from a higher index effect to a lower index effect. The index of @effect in @clip, or -1 if something went wrong. A #GESClip The effect we want to get the index of Gets the #GESBaseEffect-s that have been added to the clip. The returned list is ordered by their internal index in the clip. See ges_clip_get_top_effect_index(). A list of all #GESBaseEffect-s that have been added to @clip. A #GESClip See ges_clip_move_to_layer_full(), which also gives an error. %TRUE if @clip was successfully moved to @layer. A #GESClip The new layer Moves a clip to a new layer. If the clip already exists in a layer, it is first removed from its current layer before being added to the new layer. %TRUE if @clip was successfully moved to @layer. A #GESClip The new layer Remove a top effect from the clip. Note, if the effect is a time effect, this may be refused if the clip would not be able to adapt itself once the effect is removed. %TRUE if @effect was successfully added to @clip at @index. A #GESClip The top effect to remove Sets the #GESClip:supported-formats of the clip. This should normally only be called by subclasses, which should be responsible for updating its value, rather than the user. A #GESClip The #GESTrackType-s supported by @clip See ges_clip_set_top_effect_index_full(), which also gives an error. %TRUE if @effect was successfully moved to @newindex. A #GESClip An effect within @clip to move The index for @effect in @clip Set the index of an effect within the clip. See ges_clip_get_top_effect_index(). The new index must be an existing index of the clip. The effect is moved to the new index, and the other effects may be shifted in index accordingly to otherwise maintain the ordering. %TRUE if @effect was successfully moved to @newindex. A #GESClip An effect within @clip to move The index for @effect in @clip See ges_clip_split_full(), which also gives an error. The newly created clip resulting from the splitting @clip, or %NULL if @clip can't be split. The #GESClip to split The timeline position at which to perform the split Splits a clip at the given timeline position into two clips. The clip must already have a #GESClip:layer. The original clip's #GESTimelineElement:duration is reduced such that its end point matches the split position. Then a new clip is created in the same layer, whose #GESTimelineElement:start matches the split position and #GESTimelineElement:duration will be set such that its end point matches the old end point of the original clip. Thus, the two clips together will occupy the same positions in the timeline as the original clip did. The children of the new clip will be new copies of the original clip's children, so it will share the same sources and use the same operations. The new clip will also have its #GESTimelineElement:in-point set so that any internal data will appear in the timeline at the same time. Thus, when the timeline is played, the playback of data should appear the same. This may be complicated by any additional #GESEffect-s that have been placed on the original clip that depend on the playback time or change the data consumption rate of sources. This method will attempt to translate these effects such that the playback appears the same. In such complex situations, you may get a better result if you place the clip in a separate sub #GESProject, which only contains this clip (and its effects), and in the original layer create two neighbouring #GESUriClip-s that reference this sub-project, but at a different #GESTimelineElement:in-point. The newly created clip resulting from the splitting @clip, or %NULL if @clip can't be split. The #GESClip to split The timeline position at which to perform the split, between the start and end of the clip The maximum #GESTimelineElement:duration that can be *currently* set for the clip, taking into account the #GESTimelineElement:in-point, #GESTimelineElement:max-duration, #GESTrackElement:active, and #GESTrackElement:track properties of its children, as well as any time effects. If there is no limit, this will be set to #GST_CLOCK_TIME_NONE. Note that whilst a clip has no children in any tracks, the limit will be unknown, and similarly set to #GST_CLOCK_TIME_NONE. If the duration-limit would ever go below the current #GESTimelineElement:duration of the clip due to a change in the above variables, its #GESTimelineElement:duration will be set to the new limit. The layer this clip lies in. If you want to connect to this property's #GObject::notify signal, you should connect to it with g_signal_connect_after() since the signal emission may be stopped internally. The #GESTrackType-s that the clip supports, which it can create #GESTrackElement-s for. Note that this can be a combination of #GESTrackType flags to indicate support for several #GESTrackElement:track-type elements. The #GESUriClipAsset is a special #GESAsset specilized in #GESClip. it is mostly used to get information about the #GESTrackType-s the objects extracted from it can potentialy create #GESTrackElement for. Result: %TRUE if @self has a natural framerate %FALSE otherwise %TRUE if @self has a natural framerate @FALSE otherwise. The object from which to retrieve the natural framerate The framerate numerator The framerate denominator Converts the given frame number into a timestamp, using the "natural" frame rate of the asset. You can use this to reference a specific frame in a media file and use this as, for example, the `in-point` or `max-duration` of a #GESClip. The timestamp corresponding to @frame_number in the element source, given in internal time coordinates, or #GST_CLOCK_TIME_NONE if the clip asset does not have a natural frame rate. The object for which to compute timestamp for specifed frame The frame number we want the internal time coordinate timestamp of Result: %TRUE if @self has a natural framerate %FALSE otherwise The object from which to retrieve the natural framerate The framerate numerator The framerate denominator Gets track types for which objects extracted from @self can create #GESTrackElement The track types on which @self will create TrackElement when added to a layer a #GESClipAsset Sets track types for which objects extracted from @self can create #GESTrackElement a #GESClipAsset The track types supported by the GESClipAsset The formats supported by the asset. %TRUE if @self has a natural framerate @FALSE otherwise. The object from which to retrieve the natural framerate The framerate numerator The framerate denominator Method to create the core #GESTrackElement of a clip of this class. If a clip of this class may create several track elements per track type, this should be left as %NULL, and create_track_elements() should be used instead. Otherwise, you should implement this class method and leave create_track_elements() as the default implementation Method to create the (multiple) core #GESTrackElement-s of a clip of this class. If create_track_element() is implemented, this should be kept as the default implementation A #GESContainer is a timeline element that controls other #GESTimelineElement-s, which are its children. In particular, it is responsible for maintaining the relative #GESTimelineElement:start and #GESTimelineElement:duration times of its children. Therefore, if a container is temporally adjusted or moved to a new layer, it may accordingly adjust and move its children. Similarly, a change in one of its children may prompt the parent to correspondingly change its siblings. Groups the containers into a single container by merging them. The containers must all belong to the same #GESTimelineElement:timeline. If the elements are all #GESClip-s then this method will attempt to combine them all into a single #GESClip. This should succeed if they: share the same #GESTimelineElement:start, #GESTimelineElement:duration and #GESTimelineElement:in-point; exist in the same layer; and all of the sources share the same #GESAsset. If this fails, or one of the elements is not a #GESClip, this method will try to create a #GESGroup instead. The container created by merging @containers, or %NULL if they could not be merged into a single container. The #GESContainer-s to group Edits the container within its timeline. use #ges_timeline_element_edit instead. %TRUE if the edit of @container completed, %FALSE on failure. The #GESContainer to edit A whitelist of layers where the edit can be performed, %NULL allows all layers in the timeline The priority/index of the layer @container should be moved to. -1 means no move The edit mode The edge of @container where the edit should occur The edit position: a new location for the edge of @container (in nanoseconds) Ungroups the container by splitting it into several containers containing various children of the original. The rules for how the container splits depends on the subclass. A #GESGroup will simply split into its children. A #GESClip will split into one #GESClip per #GESTrackType it overlaps with (so an audio-video clip will split into an audio clip and a video clip), where each clip contains all the #GESTrackElement-s from the original clip with a matching #GESTrackElement:track-type. If @recursive is %TRUE, and the container contains other containers as children, then they will also be ungrouped, and so on. The list of new #GESContainer-s created from the splitting of @container. The container to ungroup Whether to recursively ungroup @container Adds a timeline element to the container. The element will now be a child of the container (and the container will be the #GESTimelineElement:parent of the added element), which means that it is now controlled by the container. This may change the properties of the child or the container, depending on the subclass. Additionally, the children properties of the newly added element will be shared with the container, meaning they can also be read and set using ges_timeline_element_get_child_property() and ges_timeline_element_set_child_property() on the container. %TRUE if @child was successfully added to @container. A #GESContainer The element to add as a child Edits the container within its timeline. use #ges_timeline_element_edit instead. %TRUE if the edit of @container completed, %FALSE on failure. The #GESContainer to edit A whitelist of layers where the edit can be performed, %NULL allows all layers in the timeline The priority/index of the layer @container should be moved to. -1 means no move The edit mode The edge of @container where the edit should occur The edit position: a new location for the edge of @container (in nanoseconds) Get the list of timeline elements contained in the container. If @recursive is %TRUE, and the container contains other containers as children, then their children will be added to the list, in addition to themselves, and so on. The list of #GESTimelineElement-s contained in @container. A #GESContainer Whether to recursively get children in @container Removes a timeline element from the container. The element will no longer be controlled by the container. %TRUE if @child was successfully removed from @container. A #GESContainer The child to remove Ungroups the container by splitting it into several containers containing various children of the original. The rules for how the container splits depends on the subclass. A #GESGroup will simply split into its children. A #GESClip will split into one #GESClip per #GESTrackType it overlaps with (so an audio-video clip will split into an audio clip and a video clip), where each clip contains all the #GESTrackElement-s from the original clip with a matching #GESTrackElement:track-type. If @recursive is %TRUE, and the container contains other containers as children, then they will also be ungrouped, and so on. The list of new #GESContainer-s created from the splitting of @container. The container to ungroup Whether to recursively ungroup @container The span of the container's children's #GESTimelineElement:priority values, which is the number of integers that lie between (inclusive) the minimum and maximum priorities found amongst the container's children (maximum - minimum + 1). The list of #GESTimelineElement-s controlled by this Container The #GESContainer:height of @obj Will be emitted after a child is added to the container. Usually, you should connect with g_signal_connect_after() since the signal may be stopped internally. The child that was added Will be emitted after a child is removed from the container. The child that was removed The list of new #GESContainer-s created from the splitting of @container. The container to ungroup Whether to recursively ungroup @container %TRUE if the edit of @container completed, %FALSE on failure. The #GESContainer to edit A whitelist of layers where the edit can be performed, %NULL allows all layers in the timeline The priority/index of the layer @container should be moved to. -1 means no move The edit mode The edge of @container where the edit should occur The edit position: a new location for the edge of @container (in nanoseconds) A function that creates a #GstElement that can be used as a source to fill the gaps of the track. A gap is a timeline region where the track has no #GESTrackElement sources. A source #GstElement to fill gaps in @track. The #GESTrack A method for creating the core #GESTrackElement of a clip, to be added to a #GESTrack of the given track type. If a clip may produce several track elements per track type, #GESCreateTrackElementsFunc is more appropriate. The #GESTrackElement created by @clip, or %NULL if @clip can not provide a track element for the given @type or an error occurred. A #GESClip A #GESTrackType to create a #GESTrackElement for A method for creating the core #GESTrackElement-s of a clip, to be added to #GESTrack-s of the given track type. A list of the #GESTrackElement-s created by @clip for the given @type, or %NULL if no track elements are created or an error occurred. A #GESClip A #GESTrackType to create #GESTrackElement-s for The edges of an object contain in a #GESTimeline or #GESTrack Represents the start of an object. Represents the end of an object. Represent the fact we are not working with any edge of an object. A human friendly name for @edge The #GESEdge to get the name of When a single timeline element is edited within its timeline at some position, using ges_timeline_element_edit(), depending on the edit mode, its #GESTimelineElement:start, #GESTimelineElement:duration or #GESTimelineElement:in-point will be adjusted accordingly. In addition, any clips may change #GESClip:layer. Each edit can be broken down into a combination of three basic edits: + MOVE: This moves the start of the element to the edit position. + START-TRIM: This cuts or grows the start of the element, whilst maintaining the time at which its internal content appears in the timeline data output. If the element is made shorter, the data that appeared at the edit position will still appear in the timeline at the same time. If the element is made longer, the data that appeared at the previous start of the element will still appear in the timeline at the same time. + END-TRIM: Similar to START-TRIM, but the end of the element is cut or grown. In particular, when editing a #GESClip: + MOVE: This will set the #GESTimelineElement:start of the clip to the edit position. + START-TRIM: This will set the #GESTimelineElement:start of the clip to the edit position. To keep the end time the same, the #GESTimelineElement:duration of the clip will be adjusted in the opposite direction. In addition, the #GESTimelineElement:in-point of the clip will be shifted such that the content that appeared at the new or previous start time, whichever is latest, still appears at the same timeline time. For example, if a frame appeared at the start of the clip, and the start of the clip is reduced, the in-point of the clip will also reduce such that the frame will appear later within the clip, but at the same timeline position. + END-TRIM: This will set the #GESTimelineElement:duration of the clip such that its end time will match the edit position. When editing a #GESGroup: + MOVE: This will set the #GESGroup:start of the clip to the edit position by shifting all of its children by the same amount. So each child will maintain their relative positions. + START-TRIM: If the group is made shorter, this will START-TRIM any clips under the group that start after the edit position to the same edit position. If the group is made longer, this will START-TRIM any clip under the group whose start matches the start of the group to the same edit position. + END-TRIM: If the group is made shorter, this will END-TRIM any clips under the group that end after the edit position to the same edit position. If the group is made longer, this will END-TRIM any clip under the group whose end matches the end of the group to the same edit position. When editing a #GESTrackElement, if it has a #GESClip parent, this will be edited instead. Otherwise it is edited in the same way as a #GESClip. The layer priority of a #GESGroup is the lowest layer priority of any #GESClip underneath it. When a group is edited to a new layer priority, it will shift all clips underneath it by the same amount, such that their relative layers stay the same. If the #GESTimeline has a #GESTimeline:snapping-distance, then snapping may occur for some of the edges of the **main** edited element: + MOVE: The start or end edge of *any* #GESSource under the element may be snapped. + START-TRIM: The start edge of a #GESSource whose start edge touches the start edge of the element may snap. + END-TRIM: The end edge of a #GESSource whose end edge touches the end edge of the element may snap. These edges may snap with either the start or end edge of *any* other #GESSource in the timeline that is not also being moved by the element, including those in different layers, if they are within the #GESTimeline:snapping-distance. During an edit, only up to one snap can occur. This will shift the edit position such that the snapped edges will touch once the edit has completed. Note that snapping can cause an edit to fail where it would have otherwise succeeded because it may push the edit position such that the edit would result in an unsupported timeline configuration. Similarly, snapping can cause an edit to succeed where it would have otherwise failed. For example, in #GES_EDIT_MODE_RIPPLE acting on #GES_EDGE_NONE, the main element is the MOVED toplevel of the edited element. Any source under the main MOVED toplevel may have its start or end edge snapped. Note, these sources cannot snap with each other. The edit may also push other elements, but any sources under these elements cannot snap, nor can they be snapped with. If a snap does occur, the MOVE of the toplevel *and* all other elements pushed by the ripple will be shifted by the same amount such that the snapped edges will touch. You can also find more explanation about the behaviour of those modes at: [trim, ripple and roll](http://pitivi.org/manual/trimming.html) and [clip management](http://pitivi.org/manual/usingclips.html). The element is edited the normal way (default). If acting on the element as a whole (#GES_EDGE_NONE), this will MOVE the element by MOVING its toplevel. When acting on the start of the element (#GES_EDGE_START), this will only MOVE the element, but not its toplevel parent. This can allow you to move a #GESClip or #GESGroup to a new start time or layer within its container group, without effecting other members of the group. When acting on the end of the element (#GES_EDGE_END), this will END-TRIM the element, leaving its toplevel unchanged. The element is edited in ripple mode: moving itself as well as later elements, keeping their relative times. This edits the element the same as #GES_EDIT_MODE_NORMAL. In addition, if acting on the element as a whole, or the start of the element, any toplevel element in the same timeline (including different layers) whose start time is later than the *current* start time of the MOVED element will also be MOVED by the same shift as the edited element. If acting on the end of the element, any toplevel element whose start time is later than the *current* end time of the edited element will also be MOVED by the same shift as the change in the end of the edited element. These additional elements will also be shifted by the same shift in layers as the edited element. The element is edited in roll mode: swapping its content for its neighbour's, or vis versa, in the timeline output. This edits the element the same as #GES_EDIT_MODE_TRIM. In addition, any neighbours are also TRIMMED at their opposite edge to the same timeline position. When acting on the start of the element, a neighbour is any earlier element in the timeline whose end time matches the *current* start time of the edited element. When acting on the end of the element, a neighbour is any later element in the timeline whose start time matches the *current* start time of the edited element. In addition, a neighbour have a #GESSource at its end/start edge that shares a track with a #GESSource at the start/end edge of the edited element. Basically, a neighbour is an element that can be extended, or cut, to have its content replace, or be replaced by, the content of the edited element. Acting on the element as a whole (#GES_EDGE_NONE) is not defined. The element can not shift layers under this mode. The element is edited in trim mode. When acting on the start of the element, this will START-TRIM it. When acting on the end of the element, this will END-TRIM it. Acting on the element as a whole (#GES_EDGE_NONE) is not defined. The element is edited in slide mode (not yet implemented): moving the element replacing or consuming content on each end. When acting on the element as a whole, this will MOVE the element, and TRIM any neighbours on either side. A neighbour is defined in the same way as in #GES_EDIT_MODE_ROLL, but they may be on either side of the edited elements. Elements at the end with be START-TRIMMED to the new end position of the edited element. Elements at the start will be END-TRIMMED to the new start position of the edited element. Acting on the start or end of the element (#GES_EDGE_START and #GES_EDGE_END) is not defined. The element can not shift layers under this mode. Return a string representation of @mode. a string representation of @mode. a #GESEditMode Currently we only support effects with N sinkpads and one single srcpad. Apart from `gesaudiomixer` and `gescompositor` which can be used as effects and where sinkpads will be requested as needed based on the timeline topology GES will always request at most one sinkpad per effect (when required). > Note: GES always adds converters (`audioconvert ! audioresample ! > audioconvert` for audio effects and `videoconvert` for video effects) to > make it simpler for end users. Creates a new #GESEffect from the description of the bin. It should be possible to determine the type of the effect through the element 'klass' metadata of the GstElements that will be created. In that corner case, you should use: #ges_asset_request (GES_TYPE_EFFECT, "audio your ! bin ! description", NULL); and extract that asset to be in full control. a newly created #GESEffect, or %NULL if something went wrong. The gst-launch like bin description of the effect The description of the effect bin with a gst-launch-style pipeline description. Example: "videobalance saturation=1.5 hue=+0.5" This asset has a GStreamer bin-description as ID and is able to determine to what track type the effect should be used in. parent class Register an element that can change the rate at which media is playing. The property type must be float or double, and must be a factor of the rate, i.e. a value of 2.0 must mean that the media plays twice as fast. Several properties may be registered for a single element type, provided they all contribute to the rate as independent factors. For example, this is true for the "GstPitch::rate" and "GstPitch::tempo" properties. These are already registered by default in GES, along with #videorate:rate for #videorate and #scaletempo:rate for #scaletempo. If such a rate property becomes a child property of a #GESEffect upon its creation (the element is part of its #GESEffect:bin-description), it will be automatically registered as a time property (see ges_base_effect_register_time_property()) and will have its time translation functions set (see ges_base_effect_set_time_translation_funcs()) to use the overall rate of the rate properties. Note that if an effect contains a rate property as well as a non-rate time property, you should ensure to set the time translation functions to some other methods using ges_base_effect_set_time_translation_funcs(). Note, you can obtain a reference to the GESEffectClass using ``` GES_EFFECT_CLASS (g_type_class_ref (GES_TYPE_EFFECT)); ``` %TRUE if the rate property was successfully registered. When this method returns %FALSE, a warning is emitted with more information. Instance of the GESEffectClass The #GstElementFactory name of the element that changes the rate The name of the property that changes the rate The effect will be applied on the sources that have lower priorities (higher number) between the inpoint and the end of it. The asset ID of an effect clip is in the form: ``` "audio ! bin ! description || video ! bin ! description" ``` Creates a new #GESEffectClip from the description of the bin. a newly created #GESEffectClip, or %NULL if something went wrong. The gst-launch like bin description of the effect The gst-launch like bin description of the effect The description of the audio track of the effect bin with a gst-launch-style pipeline description. This should be used for test purposes. Example: "audiopanorama panorama=1.0" The description of the video track of the effect bin with a gst-launch-style pipeline description. This should be used for test purposes. Example: "videobalance saturation=1.5 hue=+0.5" The ID passed is malformed An error happened while loading the asset The formatted files was malformed The frame number is invalid The operation would lead to a negative #GES_TIMELINE_ELEMENT_LAYER_PRIORITY. (Since: 1.18) The operation would lead to a negative time. E.g. for the #GESTimelineElement:start #GESTimelineElement:duration or #GESTimelineElement:in-point. (Since: 1.18) Some #GESTimelineElement does not have a large enough #GESTimelineElement:max-duration to cover the desired operation. (Since: 1.18) The operation would break one of the overlap conditions for the #GESTimeline. (Since: 1.18) A #GObject that implements the #GESExtractable interface can be extracted from a #GESAsset using ges_asset_extract(). Each extractable type will have its own way of interpreting the #GESAsset:id of an asset (or, if it is associated with a specific subclass of #GESAsset, the asset subclass may handle the interpretation of the #GESAsset:id). By default, the requested asset #GESAsset:id will be ignored by a #GESExtractable and will be set to the type name of the extractable instead. Also by default, when the requested asset is extracted, the returned object will simply be a newly created default object of that extractable type. You should check the documentation for each extractable type to see if they differ from the default. After the object is extracted, it will have a reference to the asset it came from, which you can retrieve using ges_extractable_get_asset(). Gets the #GESAsset:id of some associated asset. It may be the case that the object has no set asset, or even that such an asset does not yet exist in the GES cache. Instead, this will return the asset #GESAsset:id that is _compatible_ with the current state of the object, as determined by the #GESExtractable implementer. If it was indeed extracted from an asset, this should return the same as its corresponding asset #GESAsset:id. The #GESAsset:id of some associated #GESAsset that is compatible with @self's current state. A #GESExtractable Get the asset that has been set on the extractable object. The asset set on @self, or %NULL if no asset has been set. A #GESExtractable Gets the #GESAsset:id of some associated asset. It may be the case that the object has no set asset, or even that such an asset does not yet exist in the GES cache. Instead, this will return the asset #GESAsset:id that is _compatible_ with the current state of the object, as determined by the #GESExtractable implementer. If it was indeed extracted from an asset, this should return the same as its corresponding asset #GESAsset:id. The #GESAsset:id of some associated #GESAsset that is compatible with @self's current state. A #GESExtractable Sets the asset for this extractable object. When an object is extracted from an asset using ges_asset_extract() its asset will be automatically set. Note that many classes that implement #GESExtractable will automatically create their objects using assets when you call their @new methods. However, you can use this method to associate an object with a compatible asset if it was created by other means and does not yet have an asset. Or, for some implementations of #GESExtractable, you can use this to change the asset of the given extractable object, which will lead to a change in its state to match the new asset #GESAsset:id. %TRUE if @asset could be successfully set on @self. A #GESExtractable The asset to set Method for checking that an ID is valid for the given #GESExtractable type. If the given ID is considered valid, it can be adjusted into some standard and returned to prevent the creation of separate #GESAsset-s, with different #GESAsset:id, that would otherwise act the same. Returns (transfer full) (nullable): The actual #GESAsset:id to set on any corresponding assets, based on @id, or %NULL if @id is not valid. The #GESExtractable type to check @id for The ID to check The subclass type of #GESAsset that should be created when an asset with the corresponding #GESAsset:extractable-type is requested. The method to call to check whether a given ID is valid as an asset #GESAsset:id for the given #GESAsset:extractable-type. The returned ID is the actual #GESAsset:id that is set on the asset. The default implementation will simply always return the type name of the #GESAsset:extractable-type, even if the received ID is %NULL. As such, any given ID is considered valid (or is ignored), but only one is actually ever set on an asset, which means the given #GESAsset:extractable-type can only have one associated asset. Whether an object of this class can have its #GESAsset change over its lifetime. This should be set to %TRUE if one of the object's parameters that is associated with its ID can change after construction, which would require an asset with a new ID. Note that the subclass is required to handle the requesting and setting of the new asset on the object. The #GESAsset:id of some associated #GESAsset that is compatible with @self's current state. A #GESExtractable Tests if a given GESFrameNumber represents a valid frame Constant to define an undefined frame number A function that will be called when the nleobject of a corresponding track element needs to be filled. The implementer of this function shall add the proper #GstElement to @nleobj using gst_bin_add(). This method type is no longer used. %TRUE if the implementer successfully filled the @nleobj. The #GESClip controlling the track elements The #GESTrackElement The nleobject that needs to be filled Base class for timeline data serialization and deserialization. Checks if there is a #GESFormatter available which can load a #GESTimeline from the given URI. TRUE if there is a #GESFormatter that can support the given uri or FALSE if not. a #gchar * pointing to the URI Returns TRUE if there is a #GESFormatter available which can save a #GESTimeline to the given URI. TRUE if the given @uri is supported, else FALSE. a #gchar * pointing to a URI Get the default #GESAsset to use as formatter. It will return the asset for the #GESFormatter that has the highest @rank The #GESAsset for the formatter with highest @rank Load data from the given URI into timeline. Use @ges_timeline_load_from_uri TRUE if the timeline data was successfully loaded from the URI, else FALSE. a #GESFormatter a #GESTimeline a #gchar * pointing to a URI Save data from timeline to the given URI. Use @ges_timeline_save_to_uri TRUE if the timeline data was successfully saved to the URI else FALSE. a #GESFormatter a #GESTimeline a #gchar * pointing to a URI %TRUE to overwrite file if it exists Load data from the given URI into timeline. Use @ges_timeline_load_from_uri TRUE if the timeline data was successfully loaded from the URI, else FALSE. a #GESFormatter a #GESTimeline a #gchar * pointing to a URI Save data from timeline to the given URI. Use @ges_timeline_save_to_uri TRUE if the timeline data was successfully saved to the URI else FALSE. a #GESFormatter a #GESTimeline a #gchar * pointing to a URI %TRUE to overwrite file if it exists GES Formatter class. Override the vmethods to implement the formatter functionnality. the parent class structure Whether the URI can be loaded class method to deserialize data from a URI class method to serialize data to a URI The class to register metas on The name of the formatter The formatter description A list of coma separated file extensions handled by the formatter. The order of the extensions should match the list of the structures inside @caps The caps the formatter handled, they should match what gstreamer typefind mechanism will report for the files the formatter handles. The version of the formatter The rank of the formatter Virtual method for loading a timeline from a given URI. Every #GESFormatter subclass needs to implement this method. TRUE if the timeline data was successfully loaded from the URI, else FALSE. a #GESFormatter a #GESTimeline a #gchar * pointing to a URI Virtual method for saving a timeline to a uri. Every #GESFormatter subclass needs to implement this method. TRUE if the timeline data was successfully saved to the URI else FALSE. a #GESFormatter a #GESTimeline a #gchar * pointing to a URI %TRUE to overwrite file if it exists A #GESGroup controls one or more #GESContainer-s (usually #GESClip-s, but it can also control other #GESGroup-s). Its children must share the same #GESTimeline, but can otherwise lie in separate #GESLayer-s and have different timings. To initialise a group, you may want to use ges_container_group(), and similarly use ges_container_ungroup() to dispose of it. A group will maintain the relative #GESTimelineElement:start times of its children, as well as their relative layer #GESLayer:priority. Therefore, if one of its children has its #GESTimelineElement:start set, all other children will have their #GESTimelineElement:start shifted by the same amount. Similarly, if one of its children moves to a new layer, the other children will also change layers to maintain the difference in their layer priorities. For example, if a child moves from a layer with #GESLayer:priority 1 to a layer with priority 3, then another child that was in a layer with priority 0 will move to the layer with priority 2. The #GESGroup:start of a group refers to the earliest start time of its children. If the group's #GESGroup:start is set, all the children will be shifted equally such that the earliest start time will match the set value. The #GESGroup:duration of a group is the difference between the earliest start time and latest end time of its children. If the group's #GESGroup:duration is increased, the children whose end time matches the end of the group will be extended accordingly. If it is decreased, then any child whose end time exceeds the new end time will also have their duration decreased accordingly. A group may span several layers, but for methods such as ges_timeline_element_get_layer_priority() and ges_timeline_element_edit() a group is considered to have a layer priority that is the highest #GESLayer:priority (numerically, the smallest) of all the layers it spans. Created a new empty group. You may wish to use ges_container_group() instead, which can return a different #GESContainer subclass if possible. The new empty group. An overwrite of the #GESTimelineElement:duration property. For a #GESGroup, this is the difference between the earliest #GESTimelineElement:start time and the latest end time (given by #GESTimelineElement:start + #GESTimelineElement:duration) amongst its children. An overwrite of the #GESTimelineElement:in-point property. This has no meaning for a group and should not be set. An overwrite of the #GESTimelineElement:max-duration property. This has no meaning for a group and should not be set. An overwrite of the #GESTimelineElement:priority property. Setting #GESTimelineElement priorities is deprecated as all priority management is now done by GES itself. An overwrite of the #GESTimelineElement:start property. For a #GESGroup, this is the earliest #GESTimelineElement:start time amongst its children. Outputs the video stream from a given file as a still frame. The frame chosen will be determined by the in-point property on the track element. For image files, do not set the in-point property. This won't be used anymore and has been replaced by #GESUriSource instead which now plugs an `imagefreeze` element when #ges_uri_source_asset_is_image returns %TRUE. The location of the file/resource to use. #GESLayer-s are responsible for collecting and ordering #GESClip-s. A layer within a timeline will have an associated priority, corresponding to their index within the timeline. A layer with the index/priority 0 will have the highest priority and the layer with the largest index will have the lowest priority (the order of priorities, in this sense, is the _reverse_ of the numerical ordering of the indices). ges_timeline_move_layer() should be used if you wish to change how layers are prioritised in a timeline. Layers with higher priorities will have their content priorities over content from lower priority layers, similar to how layers are used in image editing. For example, if two separate layers both display video content, then the layer with the higher priority will have its images shown first. The other layer will only have its image shown if the higher priority layer has no content at the given playtime, or is transparent in some way. Audio content in separate layers will simply play in addition. Creates a new layer. A new layer. See ges_layer_add_asset_full(), which also gives an error. The newly created clip. The #GESLayer The asset to extract the new clip from The #GESTimelineElement:start value to set on the new clip If `start == #GST_CLOCK_TIME_NONE`, it will be added to the end of @layer, i.e. it will be set to @layer's duration The #GESTimelineElement:in-point value to set on the new clip The #GESTimelineElement:duration value to set on the new clip The #GESClip:supported-formats to set on the the new clip, or #GES_TRACK_TYPE_UNKNOWN to use the default Extracts a new clip from an asset and adds it to the layer with the given properties. The newly created clip. The #GESLayer The asset to extract the new clip from The #GESTimelineElement:start value to set on the new clip If `start == #GST_CLOCK_TIME_NONE`, it will be added to the end of @layer, i.e. it will be set to @layer's duration The #GESTimelineElement:in-point value to set on the new clip The #GESTimelineElement:duration value to set on the new clip The #GESClip:supported-formats to set on the the new clip, or #GES_TRACK_TYPE_UNKNOWN to use the default See ges_layer_add_clip_full(), which also gives an error. %TRUE if @clip was properly added to @layer, or %FALSE if @layer refused to add @clip. The #GESLayer The clip to add Adds the given clip to the layer. If the method succeeds, the layer will take ownership of the clip. This method will fail and return %FALSE if @clip already resides in some layer. It can also fail if the additional clip breaks some compositional rules (see #GESTimelineElement). %TRUE if @clip was properly added to @layer, or %FALSE if @layer refused to add @clip. The #GESLayer The clip to add Gets whether the layer is active for the given track. See ges_layer_set_active_for_tracks(). %TRUE if @layer is active for @track, or %FALSE otherwise. The #GESLayer The #GESTrack to check if @layer is currently active for Gets the #GESLayer:auto-transition of the layer. %TRUE if transitions are automatically added to @layer. The #GESLayer Get the #GESClip-s contained in this layer. A list of clips in @layer. The #GESLayer Gets the clips within the layer that appear between @start and @end. A list of #GESClip-s that intersect the interval `[start, end)` in @layer. The #GESLayer Start of the interval End of the interval Retrieves the duration of the layer, which is the difference between the start of the layer (always time 0) and the end (which will be the end time of the final clip). The duration of @layer. The layer to get the duration from Get the priority of the layer. When inside a timeline, this is its index in the timeline. See ges_timeline_move_layer(). The priority of @layer within its timeline. The #GESLayer Gets the timeline that the layer is a part of. The timeline that @layer is currently part of, or %NULL if it is not associated with any timeline. The #GESLayer Convenience method to check if the layer is empty (doesn't contain any #GESClip), or not. %TRUE if @layer is empty, %FALSE if it contains at least one clip. The #GESLayer to check Removes the given clip from the layer. %TRUE if @clip was removed from @layer, or %FALSE if the operation failed. The #GESLayer The clip to remove Activate or deactivate track elements in @tracks (or in all tracks if @tracks is %NULL). When a layer is deactivated for a track, all the #GESTrackElement-s in the track that belong to a #GESClip in the layer will no longer be active in the track, regardless of their individual #GESTrackElement:active value. Note that by default a layer will be active for all of its timeline's tracks. %TRUE if the operation worked %FALSE otherwise. The #GESLayer Whether elements in @tracks should be active or not The list of tracks @layer should be (de-)active in, or %NULL to include all the tracks in the @layer's timeline Sets #GESLayer:auto-transition for the layer. Use ges_timeline_set_auto_transition() if you want all layers within a #GESTimeline to have #GESLayer:auto-transition set to %TRUE. Use this method if you want different values for different layers (and make sure to keep #GESTimeline:auto-transition as %FALSE for the corresponding timeline). The #GESLayer Whether transitions should be automatically added to the layer Sets the layer to the given priority. See #GESLayer:priority. use #ges_timeline_move_layer instead. This deprecation means that you will not need to handle layer priorities at all yourself, GES will make sure there is never 'gaps' between layer priorities. The #GESLayer The priority to set Whether to automatically create a #GESTransitionClip whenever two #GESSource-s that both belong to a #GESClip in the layer overlap. See #GESTimeline for what counts as an overlap. When a layer is added to a #GESTimeline, if this property is left as %FALSE, but the timeline's #GESTimeline:auto-transition is %TRUE, it will be set to %TRUE as well. The priority of the layer in the #GESTimeline. 0 is the highest priority. Conceptually, a timeline is a stack of layers, and the priority of the layer represents its position in the stack. Two layers should not have the same priority within a given GESTimeline. Note that the timeline needs to be committed (with #ges_timeline_commit) for the change to be taken into account. use #ges_timeline_move_layer instead. This deprecation means that you will not need to handle layer priorities at all yourself, GES will make sure there is never 'gaps' between layer priorities. the #GESTimeline where this layer is being used. Will be emitted whenever the layer is activated or deactivated for some #GESTrack. See ges_layer_set_active_for_tracks(). Whether @layer has been made active or de-active in the @tracks A list of #GESTrack which have been activated or deactivated Will be emitted after the clip is added to the layer. The clip that was added Will be emitted after the clip is removed from the layer. The clip that was removed Subclasses can override the @get_objects if they can provide a more efficient way of providing the list of contained #GESClip-s. The description of the object, to be used in various contexts (string). The file extension of files produced by a #GESFormatter (string). The mimetype used for the file produced by a #GESFormatter (string). The name of a formatter, used as the #GESAsset:id for #GESFormatter assets (string). The rank of a #GESFormatter (a #GstRank). The version of a #GESFormatter (double). The version of the format in which a project is serialized (string). The ARGB color of a #GESMarker (an AARRGGBB hex as a uint). The volume for a #GESTrack or a #GESLayer (float). The default volume for a #GESTrack or a #GESLayer as a float. A timed #GESMetaContainer object. Current position (in nanoseconds) of the #GESMarker A #GESMarker can be colored by setting the #GES_META_MARKER_COLOR meta. Creates a new #GESMarkerList. A new #GESMarkerList The newly-added marker, the list keeps ownership of the marker The position of the new marker a #GList of the #GESMarker within the GESMarkerList. The user will have to unref each #GESMarker and free the #GList. Moves a @marker in a @list to a new @position %TRUE if the marker could be moved, %FALSE otherwise (if the marker was not present in the list for example) Removes @marker from @list, this decreases the refcount of the marker by 1. %TRUE if the marker could be removed, %FALSE otherwise (if the marker was not present in the list for example) The number of markers in @list Will be emitted after the marker was added to the marker-list. the position of the added marker the #GESMarker that was added. Will be emitted after the marker was moved to. the previous position of the marker the new position of the marker the #GESMarker that was moved. Will be emitted after the marker was removed the marker-list. the #GESMarker that was removed. A #GObject that implements #GESMetaContainer can have metadata set on it, that is data that is unimportant to its function within GES, but may hold some useful information. In particular, ges_meta_container_set_meta() can be used to store any #GValue under any generic field (specified by a string key). The same method can also be used to remove the field by passing %NULL. A number of convenience methods are also provided to make it easier to set common value types. The metadata can then be read with ges_meta_container_get_meta() and similar convenience methods. ## Registered Fields By default, any #GValue can be set for a metadata field. However, you can register some fields as static, that is they only allow values of a specific type to be set under them, using ges_meta_container_register_meta() or ges_meta_container_register_static_meta(). The set #GESMetaFlag will determine whether the value can be changed, but even if it can be changed, it must be changed to a value of the same type. Internally, some GES objects will be initialized with static metadata fields. These will correspond to some standard keys, such as #GES_META_VOLUME. Deserializes the given string, and adds and sets the found fields and their values on the container. The string should be the return of ges_meta_container_metas_to_string(). %TRUE if the fields in @str was successfully deserialized and added to @container. A #GESMetaContainer A string to deserialize and add to @container Checks whether the specified field has been registered as static, and gets the registered type and flags of the field, as used in ges_meta_container_register_meta() and ges_meta_container_register_static_meta(). %TRUE if the @meta_item field has been registered on @container. A #GESMetaContainer The key for the @container field to check A destination to get the registered flags of the field, or %NULL to ignore A destination to get the registered type of the field, or %NULL to ignore Calls the given function on each of the meta container's set metadata fields. A #GESMetaContainer A function to call on each of @container's set metadata fields User data to send to @func Gets the current boolean value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail. %TRUE if the boolean value under @meta_item was copied to @dest. A #GESMetaContainer The key for the @container field to get Destination into which the value under @meta_item should be copied. Gets the current date value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail. %TRUE if the date value under @meta_item was copied to @dest. A #GESMetaContainer The key for the @container field to get Destination into which the value under @meta_item should be copied. Gets the current date time value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail. %TRUE if the date time value under @meta_item was copied to @dest. A #GESMetaContainer The key for the @container field to get Destination into which the value under @meta_item should be copied. Gets the current double value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail. %TRUE if the double value under @meta_item was copied to @dest. A #GESMetaContainer The key for the @container field to get Destination into which the value under @meta_item should be copied. Gets the current float value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail. %TRUE if the float value under @meta_item was copied to @dest. A #GESMetaContainer The key for the @container field to get Destination into which the value under @meta_item should be copied. Gets the current int value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail. %TRUE if the int value under @meta_item was copied to @dest. A #GESMetaContainer The key for the @container field to get Destination into which the value under @meta_item should be copied. Gets the current int64 value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail. %TRUE if the int64 value under @meta_item was copied to @dest. A #GESMetaContainer The key for the @container field to get Destination into which the value under @meta_item should be copied. Gets the current marker list value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail. A copy of the marker list value under @key, or %NULL if it could not be fetched. A #GESMetaContainer The key for the @container field to get Gets the current value of the specified field of the meta container. The value under @key, or %NULL if @container does not have the field set. A #GESMetaContainer The key for the @container field to get Gets the current string value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail. The string value under @meta_item, or %NULL if it could not be fetched. A #GESMetaContainer The key for the @container field to get Gets the current uint value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail. %TRUE if the uint value under @meta_item was copied to @dest. A #GESMetaContainer The key for the @container field to get Destination into which the value under @meta_item should be copied. Gets the current uint64 value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail. %TRUE if the uint64 value under @meta_item was copied to @dest. A #GESMetaContainer The key for the @container field to get Destination into which the value under @meta_item should be copied. Serializes the set metadata fields of the meta container to a string. A serialized @container, or %NULL if an error occurred. A #GESMetaContainer Sets the value of the specified field of the meta container to the given value, and registers the field to only hold a value of the same type. After calling this, only values of the same type as @value can be set for this field. The given flags can be set to make this field only readable after calling this method. %TRUE if the @meta_item field was successfully registered on @container to only hold @value types, with the given @flags, and the field was successfully set to @value. A #GESMetaContainer Flags to be used for the registered field The key for the @container field to register The value to set for the registered field Sets the value of the specified field of the meta container to the given boolean value, and registers the field to only hold a boolean typed value. After calling this, only boolean values can be set for this field. The given flags can be set to make this field only readable after calling this method. %TRUE if the @meta_item field was successfully registered on @container to only hold boolean typed values, with the given @flags, and the field was successfully set to @value. A #GESMetaContainer Flags to be used for the registered field The key for the @container field to register The value to set for the registered field Sets the value of the specified field of the meta container to the given date value, and registers the field to only hold a date typed value. After calling this, only date values can be set for this field. The given flags can be set to make this field only readable after calling this method. %TRUE if the @meta_item field was successfully registered on @container to only hold date typed values, with the given @flags, and the field was successfully set to @value. A #GESMetaContainer Flags to be used for the registered field The key for the @container field to register The value to set for the registered field Sets the value of the specified field of the meta container to the given date time value, and registers the field to only hold a date time typed value. After calling this, only date time values can be set for this field. The given flags can be set to make this field only readable after calling this method. %TRUE if the @meta_item field was successfully registered on @container to only hold date time typed values, with the given @flags, and the field was successfully set to @value. A #GESMetaContainer Flags to be used for the registered field The key for the @container field to register The value to set for the registered field Sets the value of the specified field of the meta container to the given double value, and registers the field to only hold a double typed value. After calling this, only double values can be set for this field. The given flags can be set to make this field only readable after calling this method. %TRUE if the @meta_item field was successfully registered on @container to only hold double typed values, with the given @flags, and the field was successfully set to @value. A #GESMetaContainer Flags to be used for the registered field The key for the @container field to register The value to set for the registered field Sets the value of the specified field of the meta container to the given float value, and registers the field to only hold a float typed value. After calling this, only float values can be set for this field. The given flags can be set to make this field only readable after calling this method. %TRUE if the @meta_item field was successfully registered on @container to only hold float typed values, with the given @flags, and the field was successfully set to @value. A #GESMetaContainer Flags to be used for the registered field The key for the @container field to register The value to set for the registered field Sets the value of the specified field of the meta container to the given int value, and registers the field to only hold an int typed value. After calling this, only int values can be set for this field. The given flags can be set to make this field only readable after calling this method. %TRUE if the @meta_item field was successfully registered on @container to only hold int typed values, with the given @flags, and the field was successfully set to @value. A #GESMetaContainer Flags to be used for the registered field The key for the @container field to register The value to set for the registered field Sets the value of the specified field of the meta container to the given int64 value, and registers the field to only hold an int64 typed value. After calling this, only int64 values can be set for this field. The given flags can be set to make this field only readable after calling this method. %TRUE if the @meta_item field was successfully registered on @container to only hold int64 typed values, with the given @flags, and the field was successfully set to @value. A #GESMetaContainer Flags to be used for the registered field The key for the @container field to register The value to set for the registered field Sets the value of the specified field of the meta container to the given string value, and registers the field to only hold a string typed value. After calling this, only string values can be set for this field. The given flags can be set to make this field only readable after calling this method. %TRUE if the @meta_item field was successfully registered on @container to only hold string typed values, with the given @flags, and the field was successfully set to @value. A #GESMetaContainer Flags to be used for the registered field The key for the @container field to register The value to set for the registered field Sets the value of the specified field of the meta container to the given uint value, and registers the field to only hold a uint typed value. After calling this, only uint values can be set for this field. The given flags can be set to make this field only readable after calling this method. %TRUE if the @meta_item field was successfully registered on @container to only hold uint typed values, with the given @flags, and the field was successfully set to @value. A #GESMetaContainer Flags to be used for the registered field The key for the @container field to register The value to set for the registered field Sets the value of the specified field of the meta container to the given uint64 value, and registers the field to only hold a uint64 typed value. After calling this, only uint64 values can be set for this field. The given flags can be set to make this field only readable after calling this method. %TRUE if the @meta_item field was successfully registered on @container to only hold uint64 typed values, with the given @flags, and the field was successfully set to @value. A #GESMetaContainer Flags to be used for the registered field The key for the @container field to register The value to set for the registered field Registers a static metadata field on the container to only hold the specified type. After calling this, setting a value under this field can only succeed if its type matches the registered type of the field. Unlike ges_meta_container_register_meta(), no (initial) value is set for this field, which means you can use this method to reserve the space to be _optionally_ set later. Note that if a value has already been set for the field being registered, then its type must match the registering type, and its value will be left in place. If the field has no set value, then you will likely want to include #GES_META_WRITABLE in @flags to allow the value to be set later. %TRUE if the @meta_item field was successfully registered on @container to only hold @type values, with the given @flags. A #GESMetaContainer Flags to be used for the registered field The key for the @container field to register The required value type for the registered field Sets the value of the specified field of the meta container to the given boolean value. %TRUE if @value was set under @meta_item for @container. A #GESMetaContainer The key for the @container field to set The value to set under @meta_item Sets the value of the specified field of the meta container to the given date value. %TRUE if @value was set under @meta_item for @container. A #GESMetaContainer The key for the @container field to set The value to set under @meta_item Sets the value of the specified field of the meta container to the given date time value. %TRUE if @value was set under @meta_item for @container. A #GESMetaContainer The key for the @container field to set The value to set under @meta_item Sets the value of the specified field of the meta container to the given double value. %TRUE if @value was set under @meta_item for @container. A #GESMetaContainer The key for the @container field to set The value to set under @meta_item Sets the value of the specified field of the meta container to the given float value. %TRUE if @value was set under @meta_item for @container. A #GESMetaContainer The key for the @container field to set The value to set under @meta_item Sets the value of the specified field of the meta container to the given int value. %TRUE if @value was set under @meta_item for @container. A #GESMetaContainer The key for the @container field to set The value to set under @meta_item Sets the value of the specified field of the meta container to the given int64 value. %TRUE if @value was set under @meta_item for @container. A #GESMetaContainer The key for the @container field to set The value to set under @meta_item Sets the value of the specified field of the meta container to the given marker list value. %TRUE if @value was set under @meta_item for @container. A #GESMetaContainer The key for the @container field to set The value to set under @meta_item Sets the value of the specified field of the meta container to a copy of the given value. If the given @value is %NULL, the field given by @meta_item is removed and %TRUE is returned. %TRUE if @value was set under @meta_item for @container. A #GESMetaContainer The key for the @container field to set The value to set under @meta_item, or %NULL to remove the corresponding field Sets the value of the specified field of the meta container to the given string value. %TRUE if @value was set under @meta_item for @container. A #GESMetaContainer The key for the @container field to set The value to set under @meta_item Sets the value of the specified field of the meta container to the given uint value. %TRUE if @value was set under @meta_item for @container. A #GESMetaContainer The key for the @container field to set The value to set under @meta_item Sets the value of the specified field of the meta container to the given uint64 value. %TRUE if @value was set under @meta_item for @container. A #GESMetaContainer The key for the @container field to set The value to set under @meta_item This is emitted for a meta container whenever the metadata under one of its fields changes, is set for the first time, or is removed. In the latter case, @value will be %NULL. The key for the @container field that changed The new value under @key The metadata is readable The metadata is writable The metadata is readable and writable A method to be called on all of a meta container's fields. A #GESMetaContainer The key for one of @container's fields The set value under @key User data Outputs the video stream from a given image sequence. The start frame chosen will be determined by the in-point property on the track element. This should not be used anymore, the `imagesequence://` protocol should be used instead. Check the #imagesequencesrc GStreamer element for more information. Use #GESUriSource instead The uri of the file/resource to use. You can set a start index, a stop index and a sequence pattern. The format is &lt;multifile://start:stop\@location-pattern&gt;. The pattern uses printf string formating. Example uris: multifile:///home/you/image\%03d.jpg multifile://20:50@/home/you/sequence/\%04d.png Base class for overlays, transitions, and effects Operations are any kind of object that both outputs AND consumes data. Overlays are objects which modify the underlying layer(s). Examples of overlays include text, image watermarks, or audio dubbing. Transitions, which change from one source to another over time, are not considered overlays. parent class A #GESPipeline can take an audio-video #GESTimeline and conveniently link its #GESTrack-s to an internal #playsink element, for preview/playback, and an internal #encodebin element, for rendering. You can switch between these modes using ges_pipeline_set_mode(). You can choose the specific audio and video sinks used for previewing the timeline by setting the #GESPipeline:audio-sink and #GESPipeline:video-sink properties. You can set the encoding and save location used in rendering by calling ges_pipeline_set_render_settings(). Creates a new pipeline. The newly created pipeline. Gets the #GESPipeline:mode of the pipeline. The current mode of @pipeline. A #GESPipeline Gets a sample from the pipeline of the currently displayed image in preview, in the specified format. Note that if you use "ANY" caps for @caps, then the current format of the image is used. You can retrieve these caps from the returned sample with gst_sample_get_caps(). A sample of @self's current image preview in the format given by @caps, or %NULL if an error prevented fetching the sample. A #GESPipeline in #GST_STATE_PLAYING or #GST_STATE_PAUSED Some caps to specifying the desired format, or #GST_CAPS_ANY to use the native format Gets a sample from the pipeline of the currently displayed image in preview, in the 24-bit "RGB" format and of the desired width and height. See ges_pipeline_get_thumbnail(). A sample of @self's current image preview in the "RGB" format, scaled to @width and @height, or %NULL if an error prevented fetching the sample. A #GESPipeline in %GST_STATE_PLAYING or %GST_STATE_PAUSED The requested pixel width of the image, or -1 to use the native size The requested pixel height of the image, or -1 to use the native size Gets the #GESPipeline:audio-sink of the pipeline. The audio sink used by @self for preview. A #GESPipeline Gets the #GESPipeline:video-sink of the pipeline. The video sink used by @self for preview. A #GESPipeline Sets the #GESPipeline:audio-sink of the pipeline. A #GESPipeline in #GST_STATE_NULL A audio sink for @self to use for preview Sets the #GESPipeline:video-sink of the pipeline. A #GESPipeline in #GST_STATE_NULL A video sink for @self to use for preview Saves the currently displayed image of the pipeline in preview to the given location, in the specified dimensions and format. %TRUE if @self's current image preview was successfully saved to @location using the given @format, @height and @width. A #GESPipeline in %GST_STATE_PLAYING or %GST_STATE_PAUSED The requested pixel width of the image, or -1 to use the native size The requested pixel height of the image, or -1 to use the native size The desired mime type (for example, "image/jpeg") The path to save the thumbnail to Sets the #GESPipeline:mode of the pipeline. Note that the pipeline will be set to #GST_STATE_NULL during this call to perform the necessary changes. You will need to set the state again yourself after calling this. > **NOTE**: [Rendering settings](ges_pipeline_set_render_settings) need to be > set before setting @mode to #GES_PIPELINE_MODE_RENDER or > #GES_PIPELINE_MODE_SMART_RENDER, the call to this method will fail > otherwise. %TRUE if the mode of @pipeline was successfully set to @mode. A #GESPipeline The mode to set for @pipeline Specifies encoding setting to be used by the pipeline to render its #GESPipeline:timeline, and where the result should be written to. This method **must** be called before setting the pipeline mode to #GES_PIPELINE_MODE_RENDER. %TRUE if the settings were successfully set on @pipeline. A #GESPipeline The URI to save the #GESPipeline:timeline rendering result to The encoding to use for rendering the #GESPipeline:timeline Takes the given timeline and sets it as the #GESPipeline:timeline for the pipeline. Note that you should only call this method once on a given pipeline because a pipeline can not have its #GESPipeline:timeline changed after it has been set. %TRUE if @timeline was successfully given to @pipeline. A #GESPipeline The timeline to set for @pipeline The audio filter(s) to apply during playback in preview mode, immediately before the #GESPipeline:audio-sink. This exposes the #playsink:audio-filter property of the internal #playsink. The audio sink used for preview. This exposes the #playsink:audio-sink property of the internal #playsink. The pipeline's mode. In preview mode (for audio or video, or both) the pipeline can display the timeline's content to an end user. In rendering mode the pipeline can encode the timeline's content and save it to a file. The timeline used by this pipeline, whose content it will play and render, or %NULL if the pipeline does not yet have a timeline. Note that after you set the timeline for the first time, subsequent calls to change the timeline will fail. The video filter(s) to apply during playback in preview mode, immediately before the #GESPipeline:video-sink. This exposes the #playsink:video-filter property of the internal #playsink. The video sink used for preview. This exposes the #playsink:video-sink property of the internal #playsink. parent class The various modes a #GESPipeline can be configured to. Output the #GESPipeline:timeline's audio to the soundcard Output the #GESPipeline:timeline's video to the screen Output both the #GESPipeline:timeline's audio and video to the soundcard and screen (default) Render the #GESPipeline:timeline with forced decoding (the underlying #encodebin has its #encodebin:avoid-reencoding property set to %FALSE) Render the #GESPipeline:timeline, avoiding decoding/reencoding (the underlying #encodebin has its #encodebin:avoid-reencoding property set to %TRUE). > NOTE: Smart rendering can not work in tracks where #GESTrack:mixing > is enabled. This is a legacy format and you should avoid to use it. The formatter is really not in good shape and is deprecated. The #GESProject is used to control a set of #GESAsset and is a #GESAsset with `GES_TYPE_TIMELINE` as @extractable_type itself. That means that you can extract #GESTimeline from a project as followed: |[ GESProject *project; GESTimeline *timeline; project = ges_project_new ("file:///path/to/a/valid/project/uri"); // Here you can connect to the various signal to get more infos about // what is happening and recover from errors if possible ... timeline = ges_asset_extract (GES_ASSET (project)); ]| The #GESProject class offers a higher level API to handle #GESAsset-s. It lets you request new asset, and it informs you about new assets through a set of signals. Also it handles problem such as missing files/missing #GstElement and lets you try to recover from those. ## Subprojects In order to add a subproject, the only thing to do is to add the subproject to the main project: ``` c ges_project_add_asset (project, GES_ASSET (subproject)); ``` then the subproject will be serialized in the project files. To use the subproject in a timeline, you should use a #GESUriClip with the same subproject URI. When loading a project with subproject, subprojects URIs will be temporary writable local files. If you want to edit the subproject timeline, you should retrieve the subproject from the parent project asset list and extract the timeline with ges_asset_extract() and save it at the same temporary location. Creates a new #GESProject and sets its uri to @uri if provided. Note that if @uri is not valid or %NULL, the uri of the project will then be set the first time you save the project. If you then save the project to other locations, it will never be updated again and the first valid URI is the URI it will keep refering to. A newly created #GESProject The uri to be set after creating the project. The self The loading timeline Adds a #GESAsset to @project, the project will keep a reference on @asset. %TRUE if the asset could be added %FALSE it was already in the project A #GESProject A #GESAsset to add to @project Adds @profile to the project. It lets you save in what format the project has been renders and keep a reference to those formats. Also, those formats will be saves to the project file when possible. %TRUE if @profile could be added, %FALSE otherwize A #GESProject A #GstEncodingProfile to add to the project. If a profile with the same name already exists, it will be replaced Adds a formatter as used to load @project The project to add a formatter to A formatter used by @project Create and add a #GESAsset to @project. You should connect to the "asset-added" signal to get the asset when it finally gets added to @project %TRUE if the asset started to be added %FALSE it was already in the project A #GESProject The id of the asset to create and add to @project The #GType of the asset to create Create and add a #GESAsset to @project. You should connect to the "asset-added" signal to get the asset when it finally gets added to @project The newly created #GESAsset or %NULL. A #GESProject The id of the asset to create and add to @project The #GType of the asset to create The #GESAsset with @id or %NULL if no asset with @id as an ID A #GESProject The id of the asset to retrieve The extractable_type of the asset to retrieve from @object Get the assets that are being loaded A set of loading asset that will be added to @project. Note that those Asset are *not* loaded yet, and thus can not be used A #GESProject Retrieve the uri that is currently set on @project a newly allocated string representing uri. A #GESProject List all @asset contained in @project filtering per extractable_type as defined by @filter. It copies the asset and thus will not be updated in time. The list of #GESAsset the object contains A #GESProject Type of assets to list, `GES_TYPE_EXTRACTABLE` will list all assets Lists the encoding profile that have been set to @project. The first one is the latest added. The list of #GstEncodingProfile used in @project A #GESProject Loads @project into @timeline %TRUE if the project could be loaded %FALSE otherwize. A #GESProject that has an @uri set already A blank timeline to load @project into remove a @asset to from @project. %TRUE if the asset could be removed %FALSE otherwise A #GESProject A #GESAsset to remove from @project Save the timeline of @project to @uri. You should make sure that @timeline is one of the timelines that have been extracted from @project (using ges_asset_extract (@project);) %TRUE if the project could be save, %FALSE otherwize A #GESProject to save The #GESTimeline to save, it must have been extracted from @project The uri where to save @project and @timeline The formatter asset to use or %NULL. If %NULL, will try to save in the same format as the one from which the timeline as been loaded or default to the best formatter as defined in #ges_find_formatter_for_uri %TRUE to overwrite file if it exists The #GESAsset that has been added to @project The #GESAsset that started loading The #GESAsset that has been removed from @project The timeline that failed loading The #GError defining the error that occured Informs you that a #GESAsset could not be created. In case of missing GStreamer plugins, the error will be set to #GST_CORE_ERROR #GST_CORE_ERROR_MISSING_PLUGIN The #GError defining the error that occured, might be %NULL The @id of the asset that failed loading The @extractable_type of the asset that failed loading The #GESTimeline that completed loading The #GESTimeline that started loading |[ static gchar source_moved_cb (GESProject *project, GError *error, GESAsset *asset_with_error) { return g_strdup ("file:///the/new/uri.ogg"); } static int main (int argc, gchar ** argv) { GESTimeline *timeline; GESProject *project = ges_project_new ("file:///some/uri.xges"); g_signal_connect (project, "missing-uri", source_moved_cb, NULL); timeline = ges_asset_extract (GES_ASSET (project)); } ]| The new URI of @wrong_asset The error that happened The asset with the wrong ID, you should us it and its content only to find out what the new location is. The self The loading timeline Base class for single-media sources #GESSourceClip-s are clips whose core elements are #GESSource-s. ## Effects #GESSourceClip-s can also have #GESBaseEffect-s added as non-core elements. These effects are applied to the core sources of the clip that they share a #GESTrack with. See #GESClip for how to add and move these effects from the clip. Creates a new #GESSourceClip that renders a time overlay on top The newly created #GESSourceClip, or %NULL if there was an error. An asset types from which #GESSourceClip will be extracted The #GESTimelineElement:duration of @obj. A #GESTimelineElement The end position of @obj: #GESTimelineElement:start + #GESTimelineElement:duration. A #GESTimelineElement The #GESTimelineElement:in-point of @obj. A #GESTimelineElement See #ges_timeline_element_get_layer_priority. The object to retrieve the layer priority from The #GESTimelineElement:max-duration of @obj. A #GESTimelineElement The #GESTimelineElement:name of @obj. A #GESTimelineElement Layer priority when a timeline element is not in any layer. The #GESTimelineElement:parent of @obj. A #GESTimelineElement The #GESTimelineElement:priority of @obj. A #GESTimelineElement The #GESTimelineElement:start of @obj. A #GESTimelineElement The #GESTimelineElement:timeline of @obj. A #GESTimelineElement What the default #GESTrackElement:has-internal-source value should be for new elements from this class. A #GESTrackElementClass Useful for testing purposes. ## Asset The default asset ID is GESTestClip, but the framerate and video size can be overridden using an ID of the form: ``` framerate=60/1, width=1920, height=1080, max-duration=5.0 ``` Note: `max-duration` can be provided in seconds as float, or as GstClockTime as guint64 or gint. Creates a new #GESTestClip. The newly created #GESTestClip, or %NULL if there was an error. Creates a new #GESTestClip for the provided @nick. The newly created #GESTestClip, or %NULL if there was an error. the nickname for which to create the #GESTestClip Get the frequency @self generates. The frequency @self generates. See audiotestsrc element. a #GESTestClip Get the volume of the test audio signal applied on @self. The volume of the test audio signal applied on @self. a #GESTestClip Get the #GESVideoTestPattern which is applied on @self. The #GESVideoTestPattern which is applied on @self. a #GESTestClip Let you know if the audio track of @self is muted or not. Whether the audio track of @self is muted or not. a #GESTestClip Sets the frequency to generate. See audiotestsrc element. the #GESTestClip to set the frequency on the frequency you want to use on @self Sets whether the audio track of this clip is muted or not. the #GESTestClip on which to mute or unmute the audio track %TRUE to mute the audio track, %FALSE to unmute it Sets the volume of the test audio signal. the #GESTestClip to set the volume on the volume of the audio signal you want to use on @self Sets which video pattern to display on @self. the #GESTestClip to set the pattern on the #GESVideoTestPattern to use on @self The frequency to generate for audio track elements. Whether the sound will be played or not. The volume for the audio track elements. Video pattern to display in video track elements. Horizontal alignment of the text. align text left align text center align text right align text on xpos position Creates a new #GESTextOverlay. This should never be called by applications as this will be created by clips. The newly created #GESTextOverlay or %NULL if something went wrong. Get the color used by @source. The color used by @source. a GESTextOverlay Get the pango font description currently set on @source. The pango font description currently set on @source. a GESTextOverlay Get the horizontal aligment used by @source. The horizontal aligment used by @source. a GESTextOverlay Get the text currently set on @source. The text currently set on @source. a GESTextOverlay Get the vertical aligment used by @source. The vertical aligment used by @source. a GESTextOverlay Get the horizontal position used by @source. The horizontal position used by @source. a GESTextOverlay Get the vertical position used by @source. The vertical position used by @source. a GESTextOverlay Sets the color of the text. the #GESTextOverlay* to set The color @self is being set to Sets the pango font description of the text this track element will render. the #GESTextOverlay the pango font description Sets the horizontal aligment of the text. the #GESTextOverlay* to set text on The #GESTextHAlign defining the horizontal alignment of the text render by @self. Sets the text this track element will render. the #GESTextOverlay* to set text on the text to render. an internal copy of this text will be made. Sets the vertical aligment of the text. the #GESTextOverlay* to set text on The #GESTextVAlign defining the vertical alignment of the text render by @self. Sets the horizontal position of the text. the #GESTextOverlay* to set The horizontal position @self is being set to Sets the vertical position of the text. the #GESTextOverlay* to set The vertical position @self is being set to Renders text onto the next lower priority stream using textrender. Creates a new #GESTextOverlayClip The newly created #GESTextOverlayClip, or %NULL if there was an error. Get the color used by @source. The color used by @source. a #GESTextOverlayClip Get the pango font description used by @self. The pango font description used by @self. a #GESTextOverlayClip Get the horizontal aligment used by @self. The horizontal aligment used by @self. a #GESTextOverlayClip Get the text currently set on @self. The text currently set on @self. a #GESTextOverlayClip Get the vertical aligment used by @self. The vertical aligment used by @self. a #GESTextOverlayClip Get the horizontal position used by @source. The horizontal position used by @source. a #GESTextOverlayClip Get the vertical position used by @source. The vertical position used by @source. a #GESTextOverlayClip Sets the color of the text. the #GESTextOverlayClip* to set The color @self is being set to Sets the pango font description of the text the #GESTextOverlayClip* the pango font description Sets the horizontal aligment of the text. the #GESTextOverlayClip* to set horizontal alignement of text on #GESTextHAlign Sets the text this clip will render. the #GESTextOverlayClip* to set text on the text to render. an internal copy of this text will be made. Sets the vertical aligment of the text. the #GESTextOverlayClip* to set vertical alignement of text on #GESTextVAlign Sets the horizontal position of the text. the #GESTextOverlayClip* to set The horizontal position @self is being set to Sets the vertical position of the text. the #GESTextOverlayClip* to set The vertical position @self is being set to The color of the text Pango font description string Horizontal alignment of the text The text to diplay Vertical alignent of the text The horizontal position of the text The vertical position of the text Vertical alignment of the text. draw text on the baseline draw text on the bottom draw text on top draw text on ypos position draw text on the center #GESTimeline is the central object for any multimedia timeline. A timeline is composed of a set of #GESTrack-s and a set of #GESLayer-s, which are added to the timeline using ges_timeline_add_track() and ges_timeline_append_layer(), respectively. The contained tracks define the supported types of the timeline and provide the media output. Essentially, each track provides an additional source #GstPad. Most usage of a timeline will likely only need a single #GESAudioTrack and/or a single #GESVideoTrack. You can create such a timeline with ges_timeline_new_audio_video(). After this, you are unlikely to need to work with the tracks directly. A timeline's layers contain #GESClip-s, which in turn control the creation of #GESTrackElement-s, which are added to the timeline's tracks. See #GESTimeline::select-tracks-for-object if you wish to have more control over which track a clip's elements are added to. The layers are ordered, with higher priority layers having their content prioritised in the tracks. This ordering can be changed using ges_timeline_move_layer(). ## Editing See #GESTimelineElement for the various ways the elements of a timeline can be edited. If you change the timing or ordering of a timeline's #GESTimelineElement-s, then these changes will not actually be taken into account in the output of the timeline's tracks until the ges_timeline_commit() method is called. This allows you to move its elements around, say, in response to an end user's mouse dragging, with little expense before finalising their effect on the produced data. ## Overlaps and Auto-Transitions There are certain restrictions placed on how #GESSource-s may overlap in a #GESTrack that belongs to a timeline. These will be enforced by GES, so the user will not need to keep track of them, but they should be aware that certain edits will be refused as a result if the overlap rules would be broken. Consider two #GESSource-s, `A` and `B`, with start times `startA` and `startB`, and end times `endA` and `endB`, respectively. The start time refers to their #GESTimelineElement:start, and the end time is their #GESTimelineElement:start + #GESTimelineElement:duration. These two sources *overlap* if: + they share the same #GESTrackElement:track (non %NULL), which belongs to the timeline; + they share the same #GES_TIMELINE_ELEMENT_LAYER_PRIORITY; and + `startA < endB` and `startB < endA `. Note that when `startA = endB` or `startB = endA` then the two sources will *touch* at their edges, but are not considered overlapping. If, in addition, `startA < startB < endA`, then we can say that the end of `A` overlaps the start of `B`. If, instead, `startA <= startB` and `endA >= endB`, then we can say that `A` fully overlaps `B`. The overlap rules for a timeline are that: 1. One source cannot fully overlap another source. 2. A source can only overlap the end of up to one other source at its start. 3. A source can only overlap the start of up to one other source at its end. The last two rules combined essentially mean that at any given timeline position, only up to two #GESSource-s may overlap at that position. So triple or more overlaps are not allowed. If you switch on #GESTimeline:auto-transition, then at any moment when the end of one source (the first source) overlaps the start of another (the second source), a #GESTransitionClip will be automatically created for the pair in the same layer and it will cover their overlap. If the two elements are edited in a way such that the end of the first source no longer overlaps the start of the second, the transition will be automatically removed from the timeline. However, if the two sources still overlap at the same edges after the edit, then the same transition object will be kept, but with its timing and layer adjusted accordingly. ## Saving To save/load a timeline, you can use the ges_timeline_load_from_uri() and ges_timeline_save_to_uri() methods that use the default format. ## Playing A timeline is a #GstBin with a source #GstPad for each of its tracks, which you can fetch with ges_timeline_get_pad_for_track(). You will likely want to link these to some compatible sink #GstElement-s to be able to play or capture the content of the timeline. You can use a #GESPipeline to easily preview/play the timeline's content, or render it to a file. Creates a new empty timeline. The new timeline. Creates a new timeline containing a single #GESAudioTrack and a single #GESVideoTrack. The new timeline, or %NULL if the tracks could not be created and added. Creates a timeline from the given URI. A new timeline if the uri was loaded successfully, or %NULL if the uri could not be loaded. The URI to load from Add a layer to the timeline. If the layer contains #GESClip-s, then this may trigger the creation of their core track element children for the timeline's tracks, and the placement of the clip's children in the tracks of the timeline using #GESTimeline::select-tracks-for-object. Some errors may occur if this would break one of the configuration rules of the timeline in one of its tracks. In such cases, some track elements would fail to be added to their tracks, but this method would still return %TRUE. As such, it is advised that you only add clips to layers that already part of a timeline. In such situations, ges_layer_add_clip() is able to fail if adding the clip would cause such an error. This method requires you to ensure the layer's #GESLayer:priority will be unique to the timeline. Use ges_timeline_append_layer() and ges_timeline_move_layer() instead. %TRUE if @layer was properly added. The #GESTimeline The layer to add Add a track to the timeline. If the timeline already contains clips, then this may trigger the creation of their core track element children for the track, and the placement of the clip's children in the track of the timeline using #GESTimeline::select-tracks-for-object. Some errors may occur if this would break one of the configuration rules for the timeline in the track. In such cases, some track elements would fail to be added to the track, but this method would still return %TRUE. As such, it is advised that you avoid adding tracks to timelines that already contain clips. %TRUE if @track was properly added. The #GESTimeline The track to add Append a newly created layer to the timeline. The layer will be added at the lowest #GESLayer:priority (numerically, the highest). The newly created layer. The #GESTimeline Commit all the pending changes of the clips contained in the timeline. When changes happen in a timeline, they are not immediately executed internally, in a way that effects the output data of the timeline. You should call this method when you are done with a set of changes and you want them to be executed. Any pending changes will be executed in the backend. The #GESTimeline::commited signal will be emitted once this has completed. You should not try to change the state of the timeline, seek it or add tracks to it before receiving this signal. You can use ges_timeline_commit_sync() if you do not want to perform other tasks in the mean time. Note that all the pending changes will automatically be executed when the timeline goes from #GST_STATE_READY to #GST_STATE_PAUSED, which is usually triggered by a corresponding state changes in a containing #GESPipeline. %TRUE if pending changes were committed, or %FALSE if nothing needed to be committed. A #GESTimeline Commit all the pending changes of the clips contained in the timeline and wait for the changes to complete. See ges_timeline_commit(). %TRUE if pending changes were committed, or %FALSE if nothing needed to be committed. A #GESTimeline Gets #GESTimeline:auto-transition for the timeline. The auto-transition of @self. The #GESTimeline Get the current #GESTimeline:duration of the timeline The current duration of @timeline. The #GESTimeline Gets the element contained in the timeline with the given name. The timeline element in @timeline with the given @name, or %NULL if it was not found. The #GESTimeline The name of the element to find This method allows you to convert a timeline #GstClockTime into its corresponding #GESFrameNumber in the timeline's output. The frame number @timestamp corresponds to. A #GESTimeline The timestamp to get the corresponding frame number of This method allows you to convert a timeline output frame number into a timeline #GstClockTime. For example, this time could be used to seek to a particular frame in the timeline's output, or as the edit position for an element within the timeline. The timestamp corresponding to @frame_number in the output of @self. The self on which to retrieve the timestamp for @frame_number The frame number to get the corresponding timestamp of in the timeline coordinates Get the list of #GESGroup-s present in the timeline. The list of groups that contain clips present in @timeline's layers. Must not be changed. The #GESTimeline Retrieve the layer whose index in the timeline matches the given priority. The layer with the given @priority, or %NULL if none was found. Since 1.6 The #GESTimeline to retrieve a layer from The priority/index of the layer to find Get the list of #GESLayer-s present in the timeline. The list of layers present in @timeline sorted by priority. The #GESTimeline Search for the #GstPad corresponding to the given timeline's track. You can link to this pad to receive the output data of the given track. The pad corresponding to @track, or %NULL if there is an error. The #GESTimeline A track Gets the #GESTimeline:snapping-distance for the timeline. The snapping distance (in nanoseconds) of @timeline. The #GESTimeline Search for the #GESTrack corresponding to the given timeline's pad. The track corresponding to @pad, or %NULL if there is an error. The #GESTimeline A pad Get the list of #GESTrack-s used by the timeline. The list of tracks used by @timeline. The #GESTimeline Check whether the timeline is empty or not. %TRUE if @timeline is empty. The #GESTimeline Loads the contents of URI into the timeline. %TRUE if the timeline was loaded successfully from @uri. An empty #GESTimeline into which to load the formatter The URI to load from Moves a layer within the timeline to the index given by @new_layer_priority. An index of 0 corresponds to the layer with the highest priority in a timeline. If @new_layer_priority is greater than the number of layers present in the timeline, it will become the lowest priority layer. A #GESTimeline A layer within @timeline, whose priority should be changed The new index for @layer Paste an element inside the timeline. @element **must** be the return of ges_timeline_element_copy() with `deep=TRUE`, and it should not be changed before pasting. @element itself is not placed in the timeline, instead a new element is created, alike to the originally copied element. Note that the originally copied element must also lie within @timeline, at both the point of copying and pasting. Pasting may fail if it would place the timeline in an unsupported configuration. After calling this function @element should not be used. In particular, @element can **not** be pasted again. Instead, you can copy the returned element and paste that copy (although, this is only possible if the paste was successful). See also ges_timeline_element_paste(). The newly created element, or %NULL if pasting fails. The #GESTimeline onto which @element should be pasted The element to paste The position in the timeline @element should be pasted to, i.e. the #GESTimelineElement:start value for the pasted element. The layer into which the element should be pasted. -1 means paste to the same layer from which @element has been copied from Removes a layer from the timeline. %TRUE if @layer was properly removed. The #GESTimeline The layer to remove Remove a track from the timeline. %TRUE if @track was properly removed. The #GESTimeline The track to remove Saves the timeline to the given location. If @formatter_asset is %NULL, the method will attempt to save in the same format the timeline was loaded from, before defaulting to the formatter with highest rank. %TRUE if @timeline was successfully saved to @uri. The #GESTimeline The location to save to The formatter asset to use, or %NULL %TRUE to overwrite file if it exists Sets #GESTimeline:auto-transition for the timeline. This will also set the corresponding #GESLayer:auto-transition for all of the timeline's layers to the same value. See ges_layer_set_auto_transition() if you wish to set the layer's #GESLayer:auto-transition individually. The #GESTimeline Whether transitions should be automatically added to @timeline's layers Sets #GESTimeline:snapping-distance for the timeline. This new value will only effect future snappings and will not be used to snap the current element positions within the timeline. The #GESTimeline The snapping distance to use (in nanoseconds) Whether to automatically create a transition whenever two #GESSource-s overlap in a track of the timeline. See #GESLayer:auto-transition if you want this to only happen in some layers. The current duration (in nanoseconds) of the timeline. A timeline 'starts' at time 0, so this is the maximum end time of all of its #GESTimelineElement-s. The distance (in nanoseconds) at which a #GESTimelineElement being moved within the timeline should snap one of its #GESSource-s with another #GESSource-s edge. See #GESEditMode for which edges can snap during an edit. 0 means no snapping. A list of #GESLayer-s sorted by priority. NOTE: Do not modify. Deprecated:1.10: (element-type GES.Track): This is not thread safe, use #ges_timeline_get_tracks instead. This signal will be emitted once the changes initiated by ges_timeline_commit() have been executed in the backend. Use ges_timeline_commit_sync() if you do not want to have to connect to this signal. Will be emitted after the group is added to to the timeline. This can happen when grouping with `ges_container_group`, or by adding containers to a newly created group. Note that this should not be emitted whilst a timeline is being loaded from its #GESProject asset. You should connect to the project's #GESProject::loaded signal if you want to know which groups were created for the timeline. The group that was added to @timeline Will be emitted after the group is removed from the timeline through `ges_container_ungroup`. Note that @group will no longer contain its former children, these are held in @children. Note that if a group is emptied, then it will no longer belong to the timeline, but this signal will **not** be emitted in such a case. The group that was removed from @timeline A list of #GESContainer-s that _were_ the children of the removed @group Will be emitted after the layer is added to the timeline. Note that this should not be emitted whilst a timeline is being loaded from its #GESProject asset. You should connect to the project's #GESProject::loaded signal if you want to know which layers were created for the timeline. The layer that was added to @timeline Will be emitted after the layer is removed from the timeline. The layer that was removed from @timeline Simplified version of #GESTimeline::select-tracks-for-object which only allows @track_element to be added to a single #GESTrack. A track to put @track_element into, or %NULL if it should be discarded. The clip that @track_element is being added to The element being added This will be emitted whenever the timeline needs to determine which tracks a clip's children should be added to. The track element will be added to each of the tracks given in the return. If a track element is selected to go into multiple tracks, it will be copied into the additional tracks, under the same clip. Note that the copy will *not* keep its properties or state in sync with the original. Connect to this signal once if you wish to control which element should be added to which track. Doing so will overwrite the default behaviour, which adds @track_element to all tracks whose #GESTrack:track-type includes the @track_element's #GESTrackElement:track-type. Note that under the default track selection, if a clip would produce multiple core children of the same #GESTrackType, it will choose one of the core children arbitrarily to place in the corresponding tracks, with a warning for the other core children that are not placed in the track. For example, this would happen for a #GESUriClip that points to a file that contains multiple audio streams. If you wish to choose the stream, you could connect to this signal, and use, say, ges_uri_source_asset_get_stream_info() to choose which core source to add. When a clip is first added to a timeline, its core elements will be created for the current tracks in the timeline if they have not already been created. Then this will be emitted for each of these core children to select which tracks, if any, they should be added to. It will then be called for any non-core children in the clip. In addition, if a new track element is ever added to a clip in a timeline (and it is not already part of a track) this will be emitted to select which tracks the element should be added to. Finally, as a special case, if a track is added to the timeline *after* it already contains clips, then it will request the creation of the clips' core elements of the corresponding type, if they have not already been created, and this signal will be emitted for each of these newly created elements. In addition, this will also be released for all other track elements in the timeline's clips that have not yet been assigned a track. However, in this final case, the timeline will only check whether the newly added track appears in the track list. If it does appear, the track element will be added to the newly added track. All other tracks in the returned track list are ignored. In this latter case, track elements that are already part of a track will not be asked if they want to be copied into the new track. If you wish to do this, you can use ges_clip_add_child_to_track(). Note that the returned #GPtrArray should own a new reference to each of its contained #GESTrack. The timeline will set the #GDestroyNotify free function on the #GPtrArray to dereference the elements. An array of #GESTrack-s that @track_element should be added to, or %NULL to not add the element to any track. The clip that @track_element is being added to The element being added Will be emitted whenever a snapping event ends. After a snap event has started (see #GESTimeline::snapping-started), it can later end because either another timeline edit has occurred (which may or may not have created a new snapping event), or because the timeline has been committed. The first element that was snapping The second element that was snapping The position where the two objects were to be snapped to Will be emitted whenever an element's movement invokes a snapping event during an edit (usually of one of its ancestors) because its start or end point lies within the #GESTimeline:snapping-distance of another element's start or end point. See #GESEditMode to see what can snap during an edit. Note that only up to one snapping-started signal will be emitted per element edit within a timeline. The first element that is snapping The second element that is snapping The position where the two objects will snap to Will be emitted after the track is added to the timeline. Note that this should not be emitted whilst a timeline is being loaded from its #GESProject asset. You should connect to the project's #GESProject::loaded signal if you want to know which tracks were created for the timeline. The track that was added to @timeline Will be emitted after the track is removed from the timeline. The track that was removed from @timeline parent class A #GESTimelineElement will have some temporal extent in its corresponding #GESTimelineElement:timeline, controlled by its #GESTimelineElement:start and #GESTimelineElement:duration. This determines when its content will be displayed, or its effect applied, in the timeline. Several objects may overlap within a given #GESTimeline, in which case their #GESTimelineElement:priority is used to determine their ordering in the timeline. Priority is mostly handled internally by #GESLayer-s and #GESClip-s. A timeline element can have a #GESTimelineElement:parent, such as a #GESClip, which is responsible for controlling its timing. ## Editing Elements can be moved around in their #GESTimelineElement:timeline by setting their #GESTimelineElement:start and #GESTimelineElement:duration using ges_timeline_element_set_start() and ges_timeline_element_set_duration(). Additionally, which parts of the underlying content are played in the timeline can be adjusted by setting the #GESTimelineElement:in-point using ges_timeline_element_set_inpoint(). The library also provides ges_timeline_element_edit(), with various #GESEditMode-s, which can adjust these properties in a convenient way, as well as introduce similar changes in neighbouring or later elements in the timeline. However, a timeline may refuse a change in these properties if they would place the timeline in an unsupported configuration. See #GESTimeline for its overlap rules. Additionally, an edit may be refused if it would place one of the timing properties out of bounds (such as a negative time value for #GESTimelineElement:start, or having insufficient internal content to last for the desired #GESTimelineElement:duration). ## Time Coordinates There are three main sets of time coordinates to consider when using timeline elements: + Timeline coordinates: these are the time coordinates used in the output of the timeline in its #GESTrack-s. Each track share the same coordinates, so there is only one set of coordinates for the timeline. These extend indefinitely from 0. The times used for editing (including setting #GESTimelineElement:start and #GESTimelineElement:duration) use these coordinates, since these define when an element is present and for how long the element lasts for in the timeline. + Internal source coordinates: these are the time coordinates used internally at the element's output. This is only really defined for #GESTrackElement-s, where it refers to time coordinates used at the final source pad of the wrapped #GstElement-s. However, these coordinates may also be used in a #GESClip in reference to its children. In particular, these are the coordinates used for #GESTimelineElement:in-point and #GESTimelineElement:max-duration. + Internal sink coordinates: these are the time coordinates used internally at the element's input. A #GESSource has no input, so these would be undefined. Otherwise, for most #GESTrackElement-s these will be the same set of coordinates as the internal source coordinates because the element does not change the timing internally. Only #GESBaseEffect can support elements where these are different. See #GESBaseEffect for more information. You can determine the timeline time for a given internal source time in a #GESTrack in a #GESClip using ges_clip_get_timeline_time_from_internal_time(), and vice versa using ges_clip_get_internal_time_from_timeline_time(), for the purposes of editing and setting timings properties. ## Children Properties If a timeline element owns another #GstObject and wishes to expose some of its properties, it can do so by registering the property as one of the timeline element's children properties using ges_timeline_element_add_child_property(). The registered property of the child can then be read and set using the ges_timeline_element_get_child_property() and ges_timeline_element_set_child_property() methods, respectively. Some sub-classed objects will be created with pre-registered children properties; for example, to expose part of an underlying #GstElement that is used internally. The registered properties can be listed with ges_timeline_element_list_children_properties(). Gets the priority of the layer the element is in. A #GESGroup may span several layers, so this would return the highest priority (numerically, the smallest) amongst them. The priority of the layer @self is in, or #GES_TIMELINE_ELEMENT_NO_LAYER_PRIORITY if @self does not exist in a layer. A #GESTimelineElement Get the "natural" framerate of @self. This is to say, for example for a #GESVideoUriSource the framerate of the source. Note that a #GESAudioSource may also have a natural framerate if it derives from the same #GESSourceClip asset as a #GESVideoSource, and its value will be that of the video source. For example, if the uri of a #GESUriClip points to a file that contains both a video and audio stream, then the corresponding #GESAudioUriSource will share the natural framerate of the corresponding #GESVideoUriSource. Whether @self has a natural framerate or not, @framerate_n and @framerate_d will be set to, respectively, 0 and -1 if it is not the case. The #GESTimelineElement to get "natural" framerate from The framerate numerator The framerate denominator Gets the track types that the element can interact with, i.e. the type of #GESTrack it can exist in, or will create #GESTrackElement-s for. The track types that @self supports. A #GESTimelineElement Looks up a child property of the element. @prop_name can either be in the format "prop-name" or "TypeName::prop-name", where "prop-name" is the name of the property to look up (as used in g_object_get()), and "TypeName" is the type name of the child (as returned by G_OBJECT_TYPE_NAME()). The latter format is useful when two children of different types share the same property name. The first child found with the given "prop-name" property that was registered with ges_timeline_element_add_child_property() (and of the type "TypeName", if it was given) will be passed to @child, and the registered specification of this property will be passed to @pspec. %TRUE if a child corresponding to the property was found, in which case @child and @pspec are set. A #GESTimelineElement The name of a child property The return location for the found child The return location for the specification of the child property Edits the start time of an element within its timeline in ripple mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_RIPPLE and #GES_EDGE_NONE. %TRUE if the ripple edit of @self completed, %FALSE on failure. The #GESTimelineElement to ripple The new start time of @self in ripple mode Edits the end time of an element within its timeline in ripple mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_RIPPLE and #GES_EDGE_END. %TRUE if the ripple edit of @self completed, %FALSE on failure. The #GESTimelineElement to ripple The new end time of @self in ripple mode Edits the end time of an element within its timeline in roll mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_ROLL and #GES_EDGE_END. %TRUE if the roll edit of @self completed, %FALSE on failure. The #GESTimelineElement to roll The new end time of @self in roll mode Edits the start time of an element within its timeline in roll mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_ROLL and #GES_EDGE_START. %TRUE if the roll edit of @self completed, %FALSE on failure. The #GESTimelineElement to roll The new start time of @self in roll mode Method for setting the child property given by @pspec on @child to @value. Default implementation will use g_object_set_property(). Similar to @set_child_property, except setting can fail, with the @error being optionally set. Default implementation will call @set_child_property and return %TRUE. Sets #GESTimelineElement:duration for the element. Whilst the element is part of a #GESTimeline, this is the same as editing the element with ges_timeline_element_edit() under #GES_EDIT_MODE_TRIM with #GES_EDGE_END. In particular, the #GESTimelineElement:duration of the element may be snapped to a different timeline time difference from the one given. In addition, setting may fail if it would place the timeline in an unsupported configuration, or the element does not have enough internal content to last the desired duration. %TRUE if @duration could be set for @self. A #GESTimelineElement The desired duration in its timeline Sets #GESTimelineElement:in-point for the element. If the new in-point is above the current #GESTimelineElement:max-duration of the element, this method will fail. %TRUE if @inpoint could be set for @self. A #GESTimelineElement The in-point, in internal time coordinates Sets #GESTimelineElement:max-duration for the element. If the new maximum duration is below the current #GESTimelineElement:in-point of the element, this method will fail. %TRUE if @maxduration could be set for @self. A #GESTimelineElement The maximum duration, in internal time coordinates Sets the #GESTimelineElement:parent for the element. This is used internally and you should normally not call this. A #GESContainer will set the #GESTimelineElement:parent of its children in ges_container_add() and ges_container_remove(). Note, if @parent is not %NULL, @self must not already have a parent set. Therefore, if you wish to switch parents, you will need to call this function twice: first to set the parent to %NULL, and then to the new parent. If @parent is not %NULL, you must ensure it already has a (non-floating) reference to @self before calling this. %TRUE if @parent could be set for @self. A #GESTimelineElement @parent (nullable): New parent of @self Sets the priority of the element within the containing layer. All priority management is done by GES itself now. To set #GESEffect priorities #ges_clip_set_top_effect_index should be used. %TRUE if @priority could be set for @self. A #GESTimelineElement The priority Sets #GESTimelineElement:start for the element. If the element has a parent, this will also move its siblings with the same shift. Whilst the element is part of a #GESTimeline, this is the same as editing the element with ges_timeline_element_edit() under #GES_EDIT_MODE_NORMAL with #GES_EDGE_NONE. In particular, the #GESTimelineElement:start of the element may be snapped to a different timeline time from the one given. In addition, setting may fail if it would place the timeline in an unsupported configuration. %TRUE if @start could be set for @self. A #GESTimelineElement The desired start position of the element in its timeline Edits the start time of an element within its timeline in trim mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_TRIM and #GES_EDGE_START. %TRUE if the trim edit of @self completed, %FALSE on failure. The #GESTimelineElement to trim The new start time of @self in trim mode Register a property of a child of the element to allow it to be written with ges_timeline_element_set_child_property() and read with ges_timeline_element_get_child_property(). A change in the property will also appear in the #GESTimelineElement::deep-notify signal. @pspec should be unique from other children properties that have been registered on @self. %TRUE if the property was successfully registered. A #GESTimelineElement The specification for the property to add The #GstObject who the property belongs to Create a copy of @self. All the properties of @self are copied into a new element, with the exception of #GESTimelineElement:parent, #GESTimelineElement:timeline and #GESTimelineElement:name. Other data, such the list of a #GESContainer's children, is **not** copied. If @deep is %TRUE, then the new element is prepared so that it can be used in ges_timeline_element_paste() or ges_timeline_paste_element(). In the case of copying a #GESContainer, this ensures that the children of @self will also be pasted. The new element should not be used for anything else and can only be used **once** in a pasting operation. In particular, the new element itself is not an actual 'deep' copy of @self, but should be thought of as an intermediate object used for a single paste operation. The newly create element, copied from @self. The #GESTimelineElement to copy Whether the copy is needed for pasting See ges_timeline_element_edit_full(), which also gives an error. Note that the @layers argument is currently ignored, so you should just pass %NULL. %TRUE if the edit of @self completed, %FALSE on failure. The #GESTimelineElement to edit A whitelist of layers where the edit can be performed, %NULL allows all layers in the timeline. The priority/index of the layer @self should be moved to. -1 means no move The edit mode The edge of @self where the edit should occur The edit position: a new location for the edge of @self (in nanoseconds) in the timeline coordinates Edits the element within its timeline by adjusting its #GESTimelineElement:start, #GESTimelineElement:duration or #GESTimelineElement:in-point, and potentially doing the same for other elements in the timeline. See #GESEditMode for details about each edit mode. An edit may fail if it would place one of these properties out of bounds, or if it would place the timeline in an unsupported configuration. Note that if you act on a #GESTrackElement, this will edit its parent #GESClip instead. Moreover, for any #GESTimelineElement, if you select #GES_EDGE_NONE for #GES_EDIT_MODE_NORMAL or #GES_EDIT_MODE_RIPPLE, this will edit the toplevel instead, but still in such a way as to make the #GESTimelineElement:start of @self reach the edit @position. Note that if the element's timeline has a #GESTimeline:snapping-distance set, then the edit position may be snapped to the edge of some element under the edited element. @new_layer_priority can be used to switch @self, and other elements moved by the edit, to a new layer. New layers may be be created if the the corresponding layer priority/index does not yet exist for the timeline. %TRUE if the edit of @self completed, %FALSE on failure. The #GESTimelineElement to edit The priority/index of the layer @self should be moved to. -1 means no move The edit mode The edge of @self where the edit should occur The edit position: a new location for the edge of @self (in nanoseconds) in the timeline coordinates Gets several of the children properties of the element. See ges_timeline_element_get_child_property(). A #GESTimelineElement The name of the first child property to get The return location for the first property, followed optionally by more name/return location pairs, followed by %NULL Gets the property of a child of the element. @property_name can either be in the format "prop-name" or "TypeName::prop-name", where "prop-name" is the name of the property to get (as used in g_object_get()), and "TypeName" is the type name of the child (as returned by G_OBJECT_TYPE_NAME()). The latter format is useful when two children of different types share the same property name. The first child found with the given "prop-name" property that was registered with ges_timeline_element_add_child_property() (and of the type "TypeName", if it was given) will have the corresponding property copied into @value. Note that ges_timeline_element_get_child_properties() may be more convenient for C programming. %TRUE if the property was found and copied to @value. A #GESTimelineElement The name of the child property to get The return location for the value Gets the property of a child of the element. Specifically, the property corresponding to the @pspec used in ges_timeline_element_add_child_property() is copied into @value. A #GESTimelineElement The specification of a registered child property to get The return location for the value Gets several of the children properties of the element. See ges_timeline_element_get_child_property(). A #GESTimelineElement The name of the first child property to get The return location for the first property, followed optionally by more name/return location pairs, followed by %NULL Gets the #GESTimelineElement:duration for the element. The duration of @self (in nanoseconds). A #GESTimelineElement Gets the #GESTimelineElement:in-point for the element. The in-point of @self (in nanoseconds). A #GESTimelineElement Gets the priority of the layer the element is in. A #GESGroup may span several layers, so this would return the highest priority (numerically, the smallest) amongst them. The priority of the layer @self is in, or #GES_TIMELINE_ELEMENT_NO_LAYER_PRIORITY if @self does not exist in a layer. A #GESTimelineElement Gets the #GESTimelineElement:max-duration for the element. The max-duration of @self (in nanoseconds). A #GESTimelineElement Gets the #GESTimelineElement:name for the element. The name of @self. A #GESTimelineElement Get the "natural" framerate of @self. This is to say, for example for a #GESVideoUriSource the framerate of the source. Note that a #GESAudioSource may also have a natural framerate if it derives from the same #GESSourceClip asset as a #GESVideoSource, and its value will be that of the video source. For example, if the uri of a #GESUriClip points to a file that contains both a video and audio stream, then the corresponding #GESAudioUriSource will share the natural framerate of the corresponding #GESVideoUriSource. Whether @self has a natural framerate or not, @framerate_n and @framerate_d will be set to, respectively, 0 and -1 if it is not the case. The #GESTimelineElement to get "natural" framerate from The framerate numerator The framerate denominator Gets the #GESTimelineElement:parent for the element. The parent of @self, or %NULL if @self has no parent. A #GESTimelineElement Gets the #GESTimelineElement:priority for the element. The priority of @self. A #GESTimelineElement Gets the #GESTimelineElement:start for the element. The start of @self (in nanoseconds). A #GESTimelineElement Gets the #GESTimelineElement:timeline for the element. The timeline of @self, or %NULL if @self has no timeline. A #GESTimelineElement Gets the toplevel #GESTimelineElement:parent of the element. The toplevel parent of @self. The #GESTimelineElement to get the toplevel parent from Gets the track types that the element can interact with, i.e. the type of #GESTrack it can exist in, or will create #GESTrackElement-s for. The track types that @self supports. A #GESTimelineElement Get a list of children properties of the element, which is a list of all the specifications passed to ges_timeline_element_add_child_property(). An array of #GParamSpec corresponding to the child properties of @self, or %NULL if something went wrong. A #GESTimelineElement The return location for the length of the returned array Looks up a child property of the element. @prop_name can either be in the format "prop-name" or "TypeName::prop-name", where "prop-name" is the name of the property to look up (as used in g_object_get()), and "TypeName" is the type name of the child (as returned by G_OBJECT_TYPE_NAME()). The latter format is useful when two children of different types share the same property name. The first child found with the given "prop-name" property that was registered with ges_timeline_element_add_child_property() (and of the type "TypeName", if it was given) will be passed to @child, and the registered specification of this property will be passed to @pspec. %TRUE if a child corresponding to the property was found, in which case @child and @pspec are set. A #GESTimelineElement The name of a child property The return location for the found child The return location for the specification of the child property Paste an element inside the same timeline and layer as @self. @self **must** be the return of ges_timeline_element_copy() with `deep=TRUE`, and it should not be changed before pasting. @self is not placed in the timeline, instead a new element is created, alike to the originally copied element. Note that the originally copied element must stay within the same timeline and layer, at both the point of copying and pasting. Pasting may fail if it would place the timeline in an unsupported configuration. After calling this function @element should not be used. In particular, @element can **not** be pasted again. Instead, you can copy the returned element and paste that copy (although, this is only possible if the paste was successful). See also ges_timeline_paste_element(). The newly created element, or %NULL if pasting fails. The #GESTimelineElement to paste The position in the timeline @element should be pasted to, i.e. the #GESTimelineElement:start value for the pasted element. Remove a child property from the element. @pspec should be a specification that was passed to ges_timeline_element_add_child_property(). The corresponding property will no longer be registered as a child property for the element. %TRUE if the property was successfully un-registered for @self. A #GESTimelineElement The specification for the property to remove Edits the start time of an element within its timeline in ripple mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_RIPPLE and #GES_EDGE_NONE. %TRUE if the ripple edit of @self completed, %FALSE on failure. The #GESTimelineElement to ripple The new start time of @self in ripple mode Edits the end time of an element within its timeline in ripple mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_RIPPLE and #GES_EDGE_END. %TRUE if the ripple edit of @self completed, %FALSE on failure. The #GESTimelineElement to ripple The new end time of @self in ripple mode Edits the end time of an element within its timeline in roll mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_ROLL and #GES_EDGE_END. %TRUE if the roll edit of @self completed, %FALSE on failure. The #GESTimelineElement to roll The new end time of @self in roll mode Edits the start time of an element within its timeline in roll mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_ROLL and #GES_EDGE_START. %TRUE if the roll edit of @self completed, %FALSE on failure. The #GESTimelineElement to roll The new start time of @self in roll mode Sets several of the children properties of the element. See ges_timeline_element_set_child_property(). A #GESTimelineElement The name of the first child property to set The value for the first property, followed optionally by more name/value pairs, followed by %NULL See ges_timeline_element_set_child_property_full(), which also gives an error. Note that ges_timeline_element_set_child_properties() may be more convenient for C programming. %TRUE if the property was found and set. A #GESTimelineElement The name of the child property to set The value to set the property to Sets the property of a child of the element. Specifically, the property corresponding to the @pspec used in ges_timeline_element_add_child_property() is set to @value. A #GESTimelineElement The specification of a registered child property to set The value to set the property to Sets the property of a child of the element. @property_name can either be in the format "prop-name" or "TypeName::prop-name", where "prop-name" is the name of the property to set (as used in g_object_set()), and "TypeName" is the type name of the child (as returned by G_OBJECT_TYPE_NAME()). The latter format is useful when two children of different types share the same property name. The first child found with the given "prop-name" property that was registered with ges_timeline_element_add_child_property() (and of the type "TypeName", if it was given) will have the corresponding property set to @value. Other children that may have also matched the property name (and type name) are left unchanged! %TRUE if the property was found and set. A #GESTimelineElement The name of the child property to set The value to set the property to Sets several of the children properties of the element. See ges_timeline_element_set_child_property(). A #GESTimelineElement The name of the first child property to set The value for the first property, followed optionally by more name/value pairs, followed by %NULL Sets #GESTimelineElement:duration for the element. Whilst the element is part of a #GESTimeline, this is the same as editing the element with ges_timeline_element_edit() under #GES_EDIT_MODE_TRIM with #GES_EDGE_END. In particular, the #GESTimelineElement:duration of the element may be snapped to a different timeline time difference from the one given. In addition, setting may fail if it would place the timeline in an unsupported configuration, or the element does not have enough internal content to last the desired duration. %TRUE if @duration could be set for @self. A #GESTimelineElement The desired duration in its timeline Sets #GESTimelineElement:in-point for the element. If the new in-point is above the current #GESTimelineElement:max-duration of the element, this method will fail. %TRUE if @inpoint could be set for @self. A #GESTimelineElement The in-point, in internal time coordinates Sets #GESTimelineElement:max-duration for the element. If the new maximum duration is below the current #GESTimelineElement:in-point of the element, this method will fail. %TRUE if @maxduration could be set for @self. A #GESTimelineElement The maximum duration, in internal time coordinates Sets the #GESTimelineElement:name for the element. If %NULL is given for @name, then the library will instead generate a new name based on the type name of the element, such as the name "uriclip3" for a #GESUriClip, and will set that name instead. If @self already has a #GESTimelineElement:timeline, you should not call this function with @name set to %NULL. You should ensure that, within each #GESTimeline, every element has a unique name. If you call this function with @name as %NULL, then the library should ensure that the set generated name is unique from previously **generated** names. However, if you choose a @name that interferes with the naming conventions of the library, the library will attempt to ensure that the generated names will not conflict with the chosen name, which may lead to a different name being set instead, but the uniqueness between generated and user-chosen names is not guaranteed. %TRUE if @name or a generated name for @self could be set. A #GESTimelineElement The name @self should take Sets the #GESTimelineElement:parent for the element. This is used internally and you should normally not call this. A #GESContainer will set the #GESTimelineElement:parent of its children in ges_container_add() and ges_container_remove(). Note, if @parent is not %NULL, @self must not already have a parent set. Therefore, if you wish to switch parents, you will need to call this function twice: first to set the parent to %NULL, and then to the new parent. If @parent is not %NULL, you must ensure it already has a (non-floating) reference to @self before calling this. %TRUE if @parent could be set for @self. A #GESTimelineElement @parent (nullable): New parent of @self Sets the priority of the element within the containing layer. All priority management is done by GES itself now. To set #GESEffect priorities #ges_clip_set_top_effect_index should be used. %TRUE if @priority could be set for @self. A #GESTimelineElement The priority Sets #GESTimelineElement:start for the element. If the element has a parent, this will also move its siblings with the same shift. Whilst the element is part of a #GESTimeline, this is the same as editing the element with ges_timeline_element_edit() under #GES_EDIT_MODE_NORMAL with #GES_EDGE_NONE. In particular, the #GESTimelineElement:start of the element may be snapped to a different timeline time from the one given. In addition, setting may fail if it would place the timeline in an unsupported configuration. %TRUE if @start could be set for @self. A #GESTimelineElement The desired start position of the element in its timeline Sets the #GESTimelineElement:timeline of the element. This is used internally and you should normally not call this. A #GESClip will have its #GESTimelineElement:timeline set through its #GESLayer. A #GESTrack will similarly take care of setting the #GESTimelineElement:timeline of its #GESTrackElement-s. A #GESGroup will adopt the same #GESTimelineElement:timeline as its children. If @timeline is %NULL, this will stop its current #GESTimelineElement:timeline from tracking it, otherwise @timeline will start tracking @self. Note, in the latter case, @self must not already have a timeline set. Therefore, if you wish to switch timelines, you will need to call this function twice: first to set the timeline to %NULL, and then to the new timeline. %TRUE if @timeline could be set for @self. A #GESTimelineElement @timeline (nullable): The #GESTimeline @self should be in Edits the start time of an element within its timeline in trim mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_TRIM and #GES_EDGE_START. %TRUE if the trim edit of @self completed, %FALSE on failure. The #GESTimelineElement to trim The new start time of @self in trim mode The duration that the element is in effect for in the timeline (a time difference in nanoseconds using the time coordinates of the timeline). For example, for a source element, this would determine for how long it should output its internal content for. For an operation element, this would determine for how long its effect should be applied to any source content. The initial offset to use internally when outputting content (in nanoseconds, but in the time coordinates of the internal content). For example, for a #GESVideoUriSource that references some media file, the "internal content" is the media file data, and the in-point would correspond to some timestamp in the media file. When playing the timeline, and when the element is first reached at timeline-time #GESTimelineElement:start, it will begin outputting the data from the timestamp in-point **onwards**, until it reaches the end of its #GESTimelineElement:duration in the timeline. For elements that have no internal content, this should be kept as 0. The full duration of internal content that is available (a time difference in nanoseconds using the time coordinates of the internal content). This will act as a cap on the #GESTimelineElement:in-point of the element (which is in the same time coordinates), and will sometimes be used to limit the #GESTimelineElement:duration of the element in the timeline. For example, for a #GESVideoUriSource that references some media file, this would be the length of the media file. For elements that have no internal content, or whose content is indefinite, this should be kept as #GST_CLOCK_TIME_NONE. The name of the element. This should be unique within its timeline. The parent container of the element. The priority of the element. Priority management is now done by GES itself. Whether the element should be serialized. The starting position of the element in the timeline (in nanoseconds and in the time coordinates of the timeline). For example, for a source element, this would determine the time at which it should start outputting its internal content. For an operation element, this would determine the time at which it should start applying its effect to any source content. The timeline that the element lies within. The #GESTimelineElement:parent of the element The #GESAsset from which the object has been extracted The #GESTimelineElement:start of the element The #GESTimelineElement:in-point of the element The #GESTimelineElement:duration of the element The #GESTimelineElement:max-duration of the element The #GESTimelineElement:priority of the element The #GESTimelineElement:timeline of the element The #GESTimelineElement:name of the element Emitted when the element has a new child property registered. See ges_timeline_element_add_child_property(). Note that some GES elements will be automatically created with pre-registered children properties. You can use ges_timeline_element_list_children_properties() to list these. The child whose property has been registered The specification for the property that has been registered Emitted when the element has a child property unregistered. See ges_timeline_element_remove_child_property(). The child whose property has been unregistered The specification for the property that has been unregistered Emitted when a child of the element has one of its registered properties set. See ges_timeline_element_add_child_property(). Note that unlike #GObject::notify, a child property name can not be used as a signal detail. The child whose property has been set The specification for the property that been set The #GESTimelineElement base class. Subclasses should override at least @set_start @set_inpoint @set_duration @ripple @ripple_end @roll_start @roll_end and @trim. Vmethods in subclasses should apply all the operation they need to but the real method implementation is in charge of setting the proper field, and emitting the notify signal. %TRUE if @parent could be set for @self. A #GESTimelineElement @parent (nullable): New parent of @self %TRUE if @start could be set for @self. A #GESTimelineElement The desired start position of the element in its timeline %TRUE if @inpoint could be set for @self. A #GESTimelineElement The in-point, in internal time coordinates %TRUE if @duration could be set for @self. A #GESTimelineElement The desired duration in its timeline %TRUE if @maxduration could be set for @self. A #GESTimelineElement The maximum duration, in internal time coordinates %TRUE if @priority could be set for @self. A #GESTimelineElement The priority %TRUE if the ripple edit of @self completed, %FALSE on failure. The #GESTimelineElement to ripple The new start time of @self in ripple mode %TRUE if the ripple edit of @self completed, %FALSE on failure. The #GESTimelineElement to ripple The new end time of @self in ripple mode %TRUE if the roll edit of @self completed, %FALSE on failure. The #GESTimelineElement to roll The new start time of @self in roll mode %TRUE if the roll edit of @self completed, %FALSE on failure. The #GESTimelineElement to roll The new end time of @self in roll mode %TRUE if the trim edit of @self completed, %FALSE on failure. The #GESTimelineElement to trim The new start time of @self in trim mode %TRUE if a child corresponding to the property was found, in which case @child and @pspec are set. A #GESTimelineElement The name of a child property The return location for the found child The return location for the specification of the child property The track types that @self supports. A #GESTimelineElement The priority of the layer @self is in, or #GES_TIMELINE_ELEMENT_NO_LAYER_PRIORITY if @self does not exist in a layer. A #GESTimelineElement Whether @self has a natural framerate or not, @framerate_n and @framerate_d will be set to, respectively, 0 and -1 if it is not the case. The #GESTimelineElement to get "natural" framerate from The framerate numerator The framerate denominator Renders the given text in the specified font, at specified position, and with the specified background pattern. Creates a new #GESTitleClip The newly created #GESTitleClip, or %NULL if there was an error. Get the background used by @self. use #ges_timeline_element_get_children_properties instead. See #GESTitleSource for more information about exposed properties The color used by @self. a #GESTitleClip Get the pango font description used by @self. use #ges_timeline_element_get_children_properties instead. See #GESTitleSource for more information about exposed properties The pango font description used by @self. a #GESTitleClip Get the horizontal aligment used by @self. use #ges_timeline_element_get_children_properties instead. See #GESTitleSource for more information about exposed properties The horizontal aligment used by @self. a #GESTitleClip Get the text currently set on @self. use #ges_timeline_element_get_children_properties instead. See #GESTitleSource for more information about exposed properties The text currently set on @self. a #GESTitleClip Get the color used by @self. use #ges_timeline_element_get_children_properties instead. See #GESTitleSource for more information about exposed properties The color used by @self. a #GESTitleClip Get the vertical aligment used by @self. use #ges_timeline_element_get_children_properties instead. See #GESTitleSource for more information about exposed properties The vertical aligment used by @self. a #GESTitleClip Get the horizontal position used by @self. use #ges_timeline_element_get_children_properties instead. See #GESTitleSource for more information about exposed properties The horizontal position used by @self. a #GESTitleClip Get the vertical position used by @self. use #ges_timeline_element_get_children_property instead The vertical position used by @self. a #GESTitleClip Sets the background of the text. use #ges_timeline_element_set_children_properties instead. See #GESTitleSource for more information about exposed properties the #GESTitleClip* to set The color @self is being set to Sets the color of the text. use #ges_timeline_element_set_children_properties instead. See #GESTitleSource for more information about exposed properties the #GESTitleClip* to set The color @self is being set to Sets the pango font description of the text. use #ges_timeline_element_set_children_properties instead. See #GESTitleSource for more information about exposed properties the #GESTitleClip* the pango font description Sets the horizontal aligment of the text. use #ges_timeline_element_set_children_properties instead. See #GESTitleSource for more information about exposed properties the #GESTitleClip* to set horizontal alignement of text on #GESTextHAlign Sets the text this clip will render. use #ges_timeline_element_set_children_properties instead. See #GESTitleSource for more information about exposed properties the #GESTitleClip* to set text on the text to render. an internal copy of this text will be made. Sets the vertical aligment of the text. use #ges_timeline_element_set_children_properties instead. See #GESTitleSource for more information about exposed properties the #GESTitleClip* to set vertical alignement of text on #GESTextVAlign Sets the horizontal position of the text. use #ges_timeline_element_set_children_properties instead. See #GESTitleSource for more information about exposed properties the #GESTitleClip* to set The horizontal position @self is being set to Sets the vertical position of the text. use #ges_timeline_element_set_children_properties instead. See #GESTitleSource for more information about exposed properties the #GESTitleClip* to set The vertical position @self is being set to The background of the text use #ges_timeline_element_set_children_properties or #ges_timeline_element_get_children_properties instead. See #GESTitleSource for more information about exposed properties The color of the text use #ges_timeline_element_set_children_properties or #ges_timeline_element_get_children_properties instead. See #GESTitleSource for more information about exposed properties Pango font description string use #ges_timeline_element_set_children_properties or #ges_timeline_element_get_children_properties instead. See #GESTitleSource for more information about exposed properties Horizontal alignment of the text use #ges_timeline_element_set_children_properties or #ges_timeline_element_get_children_properties instead. See #GESTitleSource for more information about exposed properties The text to diplay use #ges_timeline_element_set_children_properties or #ges_timeline_element_get_children_properties instead. See #GESTitleSource for more information about exposed properties Vertical alignent of the text use #ges_timeline_element_set_children_properties or #ges_timeline_element_get_children_properties instead. See #GESTitleSource for more information about exposed properties The horizontal position of the text use #ges_timeline_element_set_children_properties or #ges_timeline_element_get_children_properties instead. See #GESTitleSource for more information about exposed properties The vertical position of the text use #ges_timeline_element_set_children_properties or #ges_timeline_element_get_children_properties instead. See #GESTitleSource for more information about exposed properties #GESTitleSource is a GESTimelineElement that implements the notion of titles in GES. Get the background used by @source. The background used by @source. a #GESTitleSource Get the pango font description used by @source. Use ges_timeline_element_get_child_property instead (this actually returns a newly allocated string) The pango font description used by this @source. a #GESTitleSource Get the horizontal aligment used by @source. The horizontal aligment used by @source. a #GESTitleSource Get the text currently set on the @source. Use ges_timeline_element_get_child_property instead (this actually returns a newly allocated string) The text currently set on the @source. a #GESTitleSource Get the color used by @source. The color used by @source. a #GESTitleSource Get the vertical aligment used by @source. The vertical aligment used by @source. a #GESTitleSource Get the horizontal position used by @source. The horizontal position used by @source. a #GESTitleSource Get the vertical position used by @source. The vertical position used by @source. a #GESTitleSource Sets the color of the background the #GESTitleSource* to set the color @self is being set to Set the pango font description this source will use to render the text. the #GESTitleSource the pango font description Sets the vertical aligment of the text. the #GESTitleSource* to set text on #GESTextHAlign Sets the text this track element will render. use ges_track_element_get/set_children_properties on the GESTrackElement instead the #GESTitleSource* to set text on the text to render. an internal copy of this text will be made. Sets the color of the text. the #GESTitleSource* to set the color @self is being set to Sets the vertical aligment of the text. the #GESTitleSource* to set text on #GESTextVAlign Sets the horizontal position of the text. the #GESTitleSource* to set the horizontal position @self is being set to Sets the vertical position of the text. the #GESTitleSource* to set the color @self is being set to parent class A #GESTrack acts an output source for a #GESTimeline. Each one essentially provides an additional #GstPad for the timeline, with #GESTrack:restriction-caps capabilities. Internally, a track wraps an #nlecomposition filtered by a #capsfilter. A track will contain a number of #GESTrackElement-s, and its role is to select and activate these elements according to their timings when the timeline in played. For example, a track would activate a #GESSource when its #GESTimelineElement:start is reached by outputting its data for its #GESTimelineElement:duration. Similarly, a #GESOperation would be activated by applying its effect to the source data, starting from its #GESTimelineElement:start time and lasting for its #GESTimelineElement:duration. For most users, it will usually be sufficient to add newly created tracks to a timeline, but never directly add an element to a track. Whenever a #GESClip is added to a timeline, the clip adds its elements to the timeline's tracks and assumes responsibility for updating them. Creates a new track with the given track-type and caps. If @type is #GES_TRACK_TYPE_VIDEO, and @caps is a subset of "video/x-raw(ANY)", then a #GESVideoTrack is created. This will automatically choose a gap creation method suitable for video data. You will likely want to set #GESTrack:restriction-caps separately. You may prefer to use the ges_video_track_new() method instead. If @type is #GES_TRACK_TYPE_AUDIO, and @caps is a subset of "audio/x-raw(ANY)", then a #GESAudioTrack is created. This will automatically choose a gap creation method suitable for audio data, and will set the #GESTrack:restriction-caps to the default for #GESAudioTrack. You may prefer to use the ges_audio_track_new() method instead. Otherwise, a plain #GESTrack is returned. You will likely want to set the #GESTrack:restriction-caps and call ges_track_set_create_element_for_gap_func() on the returned track. A new track. The #GESTrack:track-type for the track The #GESTrack:caps for the track See ges_track_add_element(), which also gives an error. %TRUE if @object was successfully added to @track. A #GESTrack The element to add Adds the given track element to the track, which takes ownership of the element. Note that this can fail if it would break a configuration rule of the track's #GESTimeline. Note that a #GESTrackElement can only be added to one track. %TRUE if @object was successfully added to @track. A #GESTrack The element to add Commits all the pending changes for the elements contained in the track. When changes are made to the timing or priority of elements within a track, they are not directly executed for the underlying #nlecomposition and its children. This method will finally execute these changes so they are reflected in the data output of the track. Any pending changes will be executed in the backend. The #GESTimeline::commited signal will be emitted once this has completed. Note that ges_timeline_commit() will call this method on all of its tracks, so you are unlikely to need to use this directly. %TRUE if pending changes were committed, or %FALSE if nothing needed to be committed. A #GESTrack Get the #GESTrack:caps of the track. The caps of @track. A #GESTrack Gets the track elements contained in the track. The returned list is sorted by the element's #GESTimelineElement:priority and #GESTimelineElement:start. A list of all the #GESTrackElement-s in @track. A #GESTrack Gets the #GESTrack:mixing of the track. Whether @track is mixing. A #GESTrack Gets the #GESTrack:restriction-caps of the track. The restriction-caps of @track. A #GESTrack Get the timeline this track belongs to. The timeline that @track belongs to, or %NULL if it does not belong to a timeline. A #GESTrack See ges_track_remove_element_full(), which also returns an error. %TRUE if @object was successfully removed from @track. A #GESTrack The element to remove Removes the given track element from the track, which revokes ownership of the element. %TRUE if @object was successfully removed from @track. A #GESTrack The element to remove Sets the function that will be used to create a #GstElement that can be used as a source to fill the gaps of the track. A gap is a timeline region where the track has no #GESTrackElement sources. Therefore, you are likely to want the #GstElement returned by the function to always produce 'empty' content, defined relative to the stream type, such as transparent frames for a video, or mute samples for audio. #GESAudioTrack and #GESVideoTrack objects are created with such a function already set appropriately. A #GESTrack The function to be used to create a source #GstElement that can fill gaps in @track Sets the #GESTrack:mixing for the track. A #GESTrack Whether @track should be mixing Sets the #GESTrack:restriction-caps for the track. > **NOTE**: Restriction caps are **not** taken into account when > using #GESPipeline:mode=#GES_PIPELINE_MODE_SMART_RENDER. A #GESTrack The new restriction-caps for @track Informs the track that it belongs to the given timeline. Calling this does not actually add the track to the timeline. For that, you should use ges_timeline_add_track(), which will also take care of informing the track that it belongs to the timeline. As such, there is no need for you to call this method. A #GESTrack @timeline (nullable): A #GESTimeline Updates the #GESTrack:restriction-caps of the track using the fields found in the given caps. Each of the #GstStructure-s in @caps is compared against the existing structure with the same index in the current #GESTrack:restriction-caps. If there is no corresponding existing structure at that index, then the new structure is simply copied to that index. Otherwise, any fields in the new structure are copied into the existing structure. This will replace existing values, and may introduce new ones, but any fields 'missing' in the new structure are left unchanged in the existing structure. For example, if the existing #GESTrack:restriction-caps are "video/x-raw, width=480, height=360", and the updating caps is "video/x-raw, format=I420, width=500; video/x-bayer, width=400", then the new #GESTrack:restriction-caps after calling this will be "video/x-raw, width=500, height=360, format=I420; video/x-bayer, width=400". A #GESTrack The caps to update the restriction-caps with The capabilities used to choose the output of the #GESTrack's elements. Internally, this is used to select output streams when several may be available, by determining whether its #GstPad is compatible (see #NleObject:caps for #nlecomposition). As such, this is used as a weaker indication of the desired output type of the track, **before** the #GESTrack:restriction-caps is applied. Therefore, this should be set to a *generic* superset of the #GESTrack:restriction-caps, such as "video/x-raw(ANY)". In addition, it should match with the track's #GESTrack:track-type. Note that when you set this property, the #GstCapsFeatures of all its #GstStructure-s will be automatically set to #GST_CAPS_FEATURES_ANY. Once a track has been added to a #GESTimeline, you should not change this. Default value: #GST_CAPS_ANY. Current duration of the track Default value: O The #nlecomposition:id of the underlying #nlecomposition. Whether the track should support the mixing of #GESLayer data, such as composing the video data of each layer (when part of the video data is transparent, the next layer will become visible) or adding together the audio data. As such, for audio and video tracks, you'll likely want to keep this set to %TRUE. The capabilities that specifies the final output format of the #GESTrack. For example, for a video track, it would specify the height, width, framerate and other properties of the stream. You may change this property after the track has been added to a #GESTimeline, but it must remain compatible with the track's #GESTrack:caps. Default value: #GST_CAPS_ANY. The track type of the track. This controls the type of #GESTrackElement-s that can be added to the track. This should match with the track's #GESTrack:caps. Once a track has been added to a #GESTimeline, you should not change this. The #GESTrack:track-type of the track This signal will be emitted once the changes initiated by ges_track_commit() have been executed in the backend. In particular, this will be emitted whenever the underlying #nlecomposition has been committed (see #nlecomposition::commited). Will be emitted after a track element is added to the track. The element that was added Will be emitted after a track element is removed from the track. The element that was removed A #GESTrackElement is a #GESTimelineElement that specifically belongs to a single #GESTrack of its #GESTimelineElement:timeline. Its #GESTimelineElement:start and #GESTimelineElement:duration specify its temporal extent in the track. Specifically, a track element wraps some nleobject, such as an #nlesource or #nleoperation, which can be retrieved with ges_track_element_get_nleobject(), and its #GESTimelineElement:start, #GESTimelineElement:duration, #GESTimelineElement:in-point, #GESTimelineElement:priority and #GESTrackElement:active properties expose the corresponding nleobject properties. When a track element is added to a track, its nleobject is added to the corresponding #nlecomposition that the track wraps. Most users will not have to work directly with track elements since a #GESClip will automatically create track elements for its timeline's tracks and take responsibility for updating them. The only track elements that are not automatically created by clips, but a user is likely to want to create, are #GESEffect-s. ## Control Bindings for Children Properties You can set up control bindings for a track element child property using ges_track_element_set_control_source(). A #GstTimedValueControlSource should specify the timed values using the internal source coordinates (see #GESTimelineElement). By default, these will be updated to lie between the #GESTimelineElement:in-point and out-point of the element. This can be switched off by setting #GESTrackElement:auto-clamp-control-sources to %FALSE. Looks up which @element and @pspec would be effected by the given @name. If various contained elements have this property name you will get the first one, unless you specify the class name in @name. Use #ges_timeline_element_lookup_child TRUE if @element and @pspec could be found. FALSE otherwise. In that case the values for @pspec and @element are not modified. Unref @element after usage. Object to lookup the property in Name of the property to look up. You can specify the name of the class as such: "ClassName::property-name", to guarantee that you get the proper GParamSpec in case various GstElement-s contain the same property name. If you don't do so, you will get the first element found, having this property and the and the corresponding GParamSpec. pointer to a #GstElement that takes the real object to set property on pointer to take the specification describing the property Adds all the properties of a #GstElement that match the criteria as children properties of the track element. If the name of @element's #GstElementFactory is not in @blacklist, and the factory's #GST_ELEMENT_METADATA_KLASS contains at least one member of @wanted_categories (e.g. #GST_ELEMENT_FACTORY_KLASS_DECODER), then all the properties of @element that are also in @whitelist are added as child properties of @self using ges_timeline_element_add_child_property(). This is intended to be used by subclasses when constructing. A #GESTrackElement The child object to retrieve properties from An array of element factory "klass" categories to whitelist, or %NULL to accept all categories A blacklist of element factory names, or %NULL to not blacklist any element factory A whitelist of element property names, or %NULL to whitelist all writeable properties Clamp the #GstTimedValueControlSource for the specified child property to lie between the #GESTimelineElement:in-point and out-point of the element. The out-point is the #GES_TIMELINE_ELEMENT_END of the element translated from the timeline coordinates to the internal source coordinates of the element. If the property does not have a #GstTimedValueControlSource set by ges_track_element_set_control_source(), nothing happens. Otherwise, if a timed value for the control source lies before the in-point of the element, or after its out-point, then it will be removed. At the in-point and out-point times, a new interpolated value will be placed. A #GESTrackElement The name of the child property to clamp the control source of Edits the element within its track. use #ges_timeline_element_edit instead. %TRUE if the edit of @object completed, %FALSE on failure. The #GESTrackElement to edit A whitelist of layers where the edit can be performed, %NULL allows all layers in the timeline The edit mode The edge of @object where the edit should occur The edit position: a new location for the edge of @object (in nanoseconds) Get all the control bindings that have been created for the children properties of the track element using ges_track_element_set_control_source(). The keys used in the returned hash table are the child property names that were passed to ges_track_element_set_control_source(), and their values are the corresponding created #GstControlBinding. A hash table containing all child-property-name/control-binding pairs for @trackelement. A #GESTrackElement Gets #GESTrackElement:auto-clamp-control-sources. Whether the control sources for the child properties of @object are automatically clamped. A #GESTrackElement Gets properties of a child of @object. Use #ges_timeline_element_get_child_properties The origin #GESTrackElement The name of the first property to get return location for the first property, followed optionally by more name/return location pairs, followed by NULL In general, a copy is made of the property contents and the caller is responsible for freeing the memory by calling g_value_unset(). Gets a property of a GstElement contained in @object. Note that #ges_track_element_get_child_property is really intended for language bindings, #ges_track_element_get_child_properties is much more convenient for C programming. Use #ges_timeline_element_get_child_property %TRUE if the property was found, %FALSE otherwise. The origin #GESTrackElement The name of the property return location for the property value, it will be initialized if it is initialized with 0 Gets a property of a child of @object. Use #ges_timeline_element_get_child_property_by_pspec A #GESTrackElement The #GParamSpec that specifies the property you want to get return location for the value Gets a property of a child of @object. If there are various child elements that have the same property name, you can distinguish them using the following syntax: 'ClasseName::property_name' as property name. If you don't, the corresponding property of the first element found will be set. Use #ges_timeline_element_get_child_property_valist The #GESTrackElement parent object The name of the first property to get Value for the first property, followed optionally by more name/return location pairs, followed by NULL Gets the control binding that was created for the specified child property of the track element using ges_track_element_set_control_source(). The given @property_name must be the same name of the child property that was passed to ges_track_element_set_control_source(). The control binding that was created for the specified child property of @object, or %NULL if @property_name does not correspond to any control binding. A #GESTrackElement The name of the child property to return the control binding of Get the #GstElement that the track element's underlying nleobject controls. The #GstElement being controlled by the nleobject that @object wraps. A #GESTrackElement Get the GNonLin object this object is controlling. use #ges_track_element_get_nleobject instead. The GNonLin object this object is controlling. A #GESTrackElement Get the nleobject that this element wraps. The nleobject that @object wraps. A #GESTrackElement Get the #GESTrackElement:track for the element. The track that @object belongs to, or %NULL if it does not belong to a track. A #GESTrackElement Gets the #GESTrackElement:track-type for the element. The track-type of @object. A #GESTrackElement Gets #GESTrackElement:has-internal-source for the element. %TRUE if @object can have its 'internal time' properties set. A #GESTrackElement Gets #GESTrackElement:active for the element. %TRUE if @object is active in its track. A #GESTrackElement Get whether the given track element is a core track element. That is, it was created by the @create_track_elements #GESClipClass method for some #GESClip. Note that such a track element can only be added to a clip that shares the same #GESAsset as the clip that created it. For example, you are allowed to move core children between clips that resulted from ges_container_ungroup(), but you could not move the core child from a #GESUriClip to a #GESTitleClip or another #GESUriClip with a different #GESUriClip:uri. Moreover, if a core track element is added to a clip, it will always be added as a core child. Therefore, if this returns %TRUE, then @element will be a core child of its parent clip. %TRUE if @element is a core track element. A #GESTrackElement Gets an array of #GParamSpec* for all configurable properties of the children of @object. Use #ges_timeline_element_list_children_properties An array of #GParamSpec* which should be freed after use or %NULL if something went wrong. The #GESTrackElement to get the list of children properties from return location for the length of the returned array Looks up which @element and @pspec would be effected by the given @name. If various contained elements have this property name you will get the first one, unless you specify the class name in @name. Use #ges_timeline_element_lookup_child TRUE if @element and @pspec could be found. FALSE otherwise. In that case the values for @pspec and @element are not modified. Unref @element after usage. Object to lookup the property in Name of the property to look up. You can specify the name of the class as such: "ClassName::property-name", to guarantee that you get the proper GParamSpec in case various GstElement-s contain the same property name. If you don't do so, you will get the first element found, having this property and the and the corresponding GParamSpec. pointer to a #GstElement that takes the real object to set property on pointer to take the specification describing the property Removes the #GstControlBinding that was created for the specified child property of the track element using ges_track_element_set_control_source(). The given @property_name must be the same name of the child property that was passed to ges_track_element_set_control_source(). %TRUE if the control binding was removed from the specified child property of @object, or %FALSE if an error occurred. A #GESTrackElement The name of the child property to remove the control binding from Sets #GESTrackElement:active for the element. %TRUE if the property was *toggled*. A #GESTrackElement Whether @object should be active in its track Sets #GESTrackElement:auto-clamp-control-sources. If set to %TRUE, this will immediately clamp all the control sources. A #GESTrackElement Whether to automatically clamp the control sources for the child properties of @object Sets a property of a child of @object. If there are various child elements that have the same property name, you can distinguish them using the following syntax: 'ClasseName::property_name' as property name. If you don't, the corresponding property of the first element found will be set. Use #ges_timeline_element_set_child_properties The #GESTrackElement parent object The name of the first property to set value for the first property, followed optionally by more name/return location pairs, followed by NULL Sets a property of a GstElement contained in @object. Note that #ges_track_element_set_child_property is really intended for language bindings, #ges_track_element_set_child_properties is much more convenient for C programming. use #ges_timeline_element_set_child_property instead %TRUE if the property was set, %FALSE otherwise. The origin #GESTrackElement The name of the property The value Sets a property of a child of @object. Use #ges_timeline_element_set_child_property_by_spec A #GESTrackElement The #GParamSpec that specifies the property you want to set The value Sets a property of a child of @object. If there are various child elements that have the same property name, you can distinguish them using the following syntax: 'ClasseName::property_name' as property name. If you don't, the corresponding property of the first element found will be set. Use #ges_timeline_element_set_child_property_valist The #GESTrackElement parent object The name of the first property to set Value for the first property, followed optionally by more name/return location pairs, followed by NULL Creates a #GstControlBinding for the specified child property of the track element using the given control source. The given @property_name should refer to an existing child property of the track element, as used in ges_timeline_element_lookup_child(). If @binding_type is "direct", then the control binding is created with gst_direct_control_binding_new() using the given control source. If @binding_type is "direct-absolute", it is created with gst_direct_control_binding_new_absolute() instead. %TRUE if the specified child property could be bound to @source, or %FALSE if an error occurred. A #GESTrackElement The control source to bind the child property to The name of the child property to control The type of binding to create ("direct" or "direct-absolute") Sets #GESTrackElement:has-internal-source for the element. If this is set to %FALSE, this method will also set the #GESTimelineElement:in-point of the element to 0 and its #GESTimelineElement:max-duration to #GST_CLOCK_TIME_NONE. %FALSE if @has_internal_source is forbidden for @object and %TRUE in any other case. A #GESTrackElement Whether the @object should be allowed to have its 'internal time' properties set. Sets the #GESTrackElement:track-type for the element. A #GESTrackElement The new track-type for @object Whether the effect of the element should be applied in its #GESTrackElement:track. If set to %FALSE, it will not be used in the output of the track. Whether the control sources on the element (see ges_track_element_set_control_source()) will be automatically updated whenever the #GESTimelineElement:in-point or out-point of the element change in value. See ges_track_element_clamp_control_source() for how this is done per control source. Default value: %TRUE This property is used to determine whether the 'internal time' properties of the element have any meaning. In particular, unless this is set to %TRUE, the #GESTimelineElement:in-point and #GESTimelineElement:max-duration can not be set to any value other than the default 0 and #GST_CLOCK_TIME_NONE, respectively. If an element has some *internal* *timed* source #GstElement that it reads stream data from as part of its function in a #GESTrack, then you'll likely want to set this to %TRUE to allow the #GESTimelineElement:in-point and #GESTimelineElement:max-duration to be set. The default value is determined by the #GESTrackElementClass @default_has_internal_source class property. For most #GESSourceClass-es, this will be %TRUE, with the exception of those that have a potentially *static* source, such as #GESImageSourceClass and #GESTitleSourceClass. Otherwise, this will usually be %FALSE. For most #GESOperation-s you will likely want to leave this set to %FALSE. The exception may be for an operation that reads some stream data from some private internal source as part of manipulating the input data from the usual linked upstream #GESTrackElement. For example, you may want to set this to %TRUE for a #GES_TRACK_TYPE_VIDEO operation that wraps a #textoverlay that reads from a subtitle file and places its text on top of the received video data. The #GESTimelineElement:in-point of the element would be used to shift the initial seek time on the #textoverlay away from 0, and the #GESTimelineElement:max-duration could be set to reflect the time at which the subtitle file runs out of data. Note that GES can not support track elements that have both internal content and manipulate the timing of their data streams (time effects). The track that this element belongs to, or %NULL if it does not belong to a track. The track type of the element, which determines the type of track the element can be added to (see #GESTrack:track-type). This should correspond to the type of data that the element can produce or process. This is emitted when a control binding is added to a child property of the track element. The control binding that has been added This is emitted when a control binding is removed from a child property of the track element. The control binding that has been removed Result: %TRUE if @self has a natural framerate %FALSE otherwise %TRUE if @self has a natural framerate @FALSE otherwise. A #GESAsset The framerate numerator The framerate denominator Result: %TRUE if @self has a natural framerate %FALSE otherwise A #GESAsset The framerate numerator The framerate denominator Get the GESAssetTrackType the #GESTrackElement extracted from @self should get into a #GESTrackType A #GESAsset Set the #GESTrackType the #GESTrackElement extracted from @self should get into A #GESAsset A #GESTrackType %TRUE if @self has a natural framerate @FALSE otherwise. A #GESAsset The framerate numerator The framerate denominator The name of the #GstElementFactory to use to create the underlying nleobject of a track element TRUE if @element and @pspec could be found. FALSE otherwise. In that case the values for @pspec and @element are not modified. Unref @element after usage. Object to lookup the property in Name of the property to look up. You can specify the name of the class as such: "ClassName::property-name", to guarantee that you get the proper GParamSpec in case various GstElement-s contain the same property name. If you don't do so, you will get the first element found, having this property and the and the corresponding GParamSpec. pointer to a #GstElement that takes the real object to set property on pointer to take the specification describing the property Types of content handled by a track. If the content is not one of @GES_TRACK_TYPE_AUDIO, @GES_TRACK_TYPE_VIDEO or @GES_TRACK_TYPE_TEXT, the user of the #GESTrack must set the type to @GES_TRACK_TYPE_CUSTOM. @GES_TRACK_TYPE_UNKNOWN is for internal purposes and should not be used by users A track of unknown type (i.e. invalid) An audio track A video track A text (subtitle) track A custom-content track Base class for media transitions. Creates an object that mixes together the two underlying objects, A and B. The A object is assumed to have a higher prioirity (lower number) than the B object. At the transition in point, only A will be visible, and by the end only B will be visible. The shape of the video transition depends on the value of the "vtype" property. The default value is "crossfade". For audio, only "crossfade" is supported. The ID of the ExtractableType is the nickname of the vtype property value. Note that this value can be changed after creation and the GESExtractable.asset value will be updated when needed. Creates a new #GESTransitionClip. a newly created #GESTransitionClip, or %NULL if something went wrong. the type of transition to create Creates a new #GESTransitionClip for the provided @nick. The newly created #GESTransitionClip, or %NULL if something went wrong a string representing the type of transition to create a #GESVideoStandardTransitionType representing the wipe to use a #GESVideoStandardTransitionType indicating the type of video transition to apply. Represents all the output streams from a particular uri. It is assumed that the URI points to a file of some type. Creates a new #GESUriClip for the provided @uri. > **WARNING**: This function might 'discover` @uri **synchrounously**, it is > an IO and processing intensive task that you probably don't want to run in > an application mainloop. Have a look at #ges_asset_request_async to see how > to make that operation happen **asynchronously**. The newly created #GESUriClip, or %NULL if there was an error. the URI the source should control Get the location of the resource. The location of the resource. the #GESUriClip Lets you know if @self is an image or not. %TRUE if @self is a still image %FALSE otherwise. the #GESUriClip Lets you know if the audio track of @self is muted or not. %TRUE if the audio track of @self is muted, %FALSE otherwise. the #GESUriClip Sets whether the clip is a still image or not. the #GESUriClip %TRUE if @self is a still image, %FALSE otherwise Sets whether the audio track of this clip is muted or not. the #GESUriClip on which to mute or unmute the audio track %TRUE to mute @self audio track, %FALSE to unmute it Whether this uri clip represents a still image or not. This must be set before create_track_elements is called. Whether the sound will be played or not. The location of the file/resource to use. Finalize the request of an async #GESUriClipAsset The #GESUriClipAsset previously requested The #GAsyncResult from which to get the newly created #GESUriClipAsset Creates a #GESUriClipAsset for @uri Example of request of a GESUriClipAsset: |[ // The request callback static void filesource_asset_loaded_cb (GESAsset * source, GAsyncResult * res, gpointer user_data) { GError *error = NULL; GESUriClipAsset *filesource_asset; filesource_asset = ges_uri_clip_asset_finish (res, &error); if (filesource_asset) { g_print ("The file: %s is usable as a FileSource, it is%s an image and lasts %" GST_TIME_FORMAT, ges_asset_get_id (GES_ASSET (filesource_asset)) ges_uri_clip_asset_is_image (filesource_asset) ? "" : " not", GST_TIME_ARGS (ges_uri_clip_asset_get_duration (filesource_asset)); } else { g_print ("The file: %s is *not* usable as a FileSource because: %s", ges_asset_get_id (source), error->message); } gst_object_unref (mfs); } // The request: ges_uri_clip_asset_new (uri, (GAsyncReadyCallback) filesource_asset_loaded_cb, user_data); ]| The URI of the file for which to create a #GESUriClipAsset optional %GCancellable object, %NULL to ignore. a #GAsyncReadyCallback to call when the initialization is finished The user data to pass when @callback is called Creates a #GESUriClipAsset for @uri syncronously. You should avoid to use it in application, and rather create #GESUriClipAsset asynchronously A reference to the requested asset or %NULL if an error happened The URI of the file for which to create a #GESUriClipAsset. You can also use multi file uris for #GESMultiFileSource. Gets duration of the file represented by @self The duration of @self a #GESUriClipAsset Gets #GstDiscovererInfo about the file #GstDiscovererInfo of specified asset Target asset Gets maximum duration of the file represented by @self, it is usually the same as GESUriClipAsset::duration, but in the case of nested timelines, for example, they are different as those can be extended 'infinitely'. The maximum duration of @self a #GESUriClipAsset Get the GESUriSourceAsset @self containes a #GList of #GESUriSourceAsset A #GESUriClipAsset Gets Whether the file represented by @self is an image or not Whether the file represented by @self is an image or not a #GESUriClipAsset The duration (in nanoseconds) of the media file The duration (in nanoseconds) of the media file Sets the timeout of #GESUriClipAsset loading The #GESUriClipAssetClass on which to set the discoverer timeout The timeout to set Asset to create a stream specific #GESSource for a media file. NOTE: You should never request such a #GESAsset as they will be created automatically by #GESUriClipAsset-s. Get the #GESUriClipAsset @self is contained in a #GESUriClipAsset A #GESUriClipAsset Get the #GstDiscovererStreamInfo user by @asset a #GESUriClipAsset A #GESUriClipAsset Check if @asset contains a single image %TRUE if the video stream corresponds to an image (i.e. only contains one frame) A #GESUriClipAsset Base class for video sources Retrieves the natural size of the video stream. The natural size, is the size at which it will be displayed if no scaling is being applied. NOTE: The sources take into account the potential video rotation applied by the #videoflip element that is inside the source, effects applied on the clip which potentially also rotate the element are not taken into account. %TRUE if the object has a natural size, %FALSE otherwise. A #GESVideoSource The natural width of the underlying source The natural height of the underlying source Transition type has not been set, A bar moves from left to right, A bar moves from top to bottom, A box expands from the upper-left corner to the lower-right corner, A box expands from the upper-right corner to the lower-left corner, A box expands from the lower-right corner to the upper-left corner, A box expands from the lower-left corner to the upper-right corner, A box shape expands from each of the four corners toward the center, A box shape expands from the center of each quadrant toward the corners of each quadrant, A central, vertical line splits and expands toward the left and right edges, A central, horizontal line splits and expands toward the top and bottom edges, A box expands from the top edge's midpoint to the bottom corners, A box expands from the right edge's midpoint to the left corners, A box expands from the bottom edge's midpoint to the top corners, A box expands from the left edge's midpoint to the right corners, A diagonal line moves from the upper-left corner to the lower-right corner, A diagonal line moves from the upper right corner to the lower-left corner, Two wedge shapes slide in from the top and bottom edges toward the center, Two wedge shapes slide in from the left and right edges toward the center, A diagonal line from the lower-left to upper-right corners splits and expands toward the opposite corners, A diagonal line from upper-left to lower-right corners splits and expands toward the opposite corners, Four wedge shapes split from the center and retract toward the four edges, A diamond connecting the four edge midpoints simultaneously contracts toward the center and expands toward the edges, A wedge shape moves from top to bottom, A wedge shape moves from right to left, A wedge shape moves from bottom to top, A wedge shape moves from left to right, A 'V' shape extending from the bottom edge's midpoint to the opposite corners contracts toward the center and expands toward the edges, A 'V' shape extending from the left edge's midpoint to the opposite corners contracts toward the center and expands toward the edges, A 'V' shape extending from the top edge's midpoint to the opposite corners contracts toward the center and expands toward the edges, A 'V' shape extending from the right edge's midpoint to the opposite corners contracts toward the center and expands toward the edges, A rectangle expands from the center., A radial hand sweeps clockwise from the twelve o'clock position, A radial hand sweeps clockwise from the three o'clock position, A radial hand sweeps clockwise from the six o'clock position, A radial hand sweeps clockwise from the nine o'clock position, Two radial hands sweep clockwise from the twelve and six o'clock positions, Two radial hands sweep clockwise from the nine and three o'clock positions, Four radial hands sweep clockwise, A fan unfolds from the top edge, the fan axis at the center, A fan unfolds from the right edge, the fan axis at the center, Two fans, their axes at the center, unfold from the top and bottom, Two fans, their axes at the center, unfold from the left and right, A radial hand sweeps clockwise from the top edge's midpoint, A radial hand sweeps clockwise from the right edge's midpoint, A radial hand sweeps clockwise from the bottom edge's midpoint, A radial hand sweeps clockwise from the left edge's midpoint, Two radial hands sweep clockwise and counter-clockwise from the top and bottom edges' midpoints, Two radial hands sweep clockwise and counter-clockwise from the left and right edges' midpoints, Two radial hands attached at the top and bottom edges' midpoints sweep from right to left, Two radial hands attached at the left and right edges' midpoints sweep from top to bottom, A fan unfolds from the bottom, the fan axis at the top edge's midpoint, A fan unfolds from the left, the fan axis at the right edge's midpoint, A fan unfolds from the top, the fan axis at the bottom edge's midpoint, A fan unfolds from the right, the fan axis at the left edge's midpoint, Two fans, their axes at the top and bottom, unfold from the center, Two fans, their axes at the left and right, unfold from the center, A radial hand sweeps clockwise from the upper-left corner, A radial hand sweeps counter-clockwise from the lower-left corner., A radial hand sweeps clockwise from the lower-right corner, A radial hand sweeps counter-clockwise from the upper-right corner, Two radial hands attached at the upper-left and lower-right corners sweep down and up, Two radial hands attached at the lower-left and upper-right corners sweep down and up, Two radial hands attached at the upper-left and upper-right corners sweep down, Two radial hands attached at the upper-left and lower-left corners sweep to the right, Two radial hands attached at the lower-left and lower-right corners sweep up, Two radial hands attached at the upper-right and lower-right corners sweep to the left, Two radial hands attached at the midpoints of the top and bottom halves sweep from right to left, Two radial hands attached at the midpoints of the left and right halves sweep from top to bottom, Two sets of radial hands attached at the midpoints of the top and bottom halves sweep from top to bottom and bottom to top, Two sets of radial hands attached at the midpoints of the left and right halves sweep from left to right and right to left, Crossfade The test pattern to produce A standard SMPTE test pattern Random noise A black image A white image A red image A green image A blue image Checkers pattern (1px) Checkers pattern (2px) Checkers pattern (4px) Checkers pattern (8px) Circular pattern Alternate between black and white SMPTE test pattern (75% color bars) Zone plate Gamut checkers Chroma zone plate Solid color ### Children Properties {{ libs/GESVideoTestSource-children-props.md }} Get the video pattern used by the @source. The video pattern used by the @source. a #GESVideoTestPattern Sets the source to use the given @pattern. a #GESVideoTestSource a #GESVideoTestPattern A #GESVideoTrack is a default video #GESTrack, with a #GES_TRACK_TYPE_VIDEO #GESTrack:track-type and "video/x-raw(ANY)" #GESTrack:caps. By default, a video track will have its #GESTrack:restriction-caps set to "video/x-raw" with the following properties: - width: 1280 - height: 720 - framerate: 30/1 These fields are needed for negotiation purposes, but you can change their values if you wish. It is advised that you do so using ges_track_update_restriction_caps() with new values for the fields you wish to change, and any additional fields you may want to add. Unlike using ges_track_set_restriction_caps(), this will ensure that these default fields will at least have some value set. Creates a new video track, with a #GES_TRACK_TYPE_VIDEO #GESTrack:track-type and "video/x-raw(ANY)" #GESTrack:caps, and "video/x-raw" #GESTrack:restriction-caps with the properties: - width: 1280 - height: 720 - framerate: 30/1 You should use ges_track_update_restriction_caps() if you wish to modify these fields, or add additional ones. The newly created video track. Get the border property of @self, this value represents the border width of the transition. The border values of @self or -1 if not meaningful (this will happen when not using a smpte transition). The #GESVideoTransition to get the border from Get the transition type used by @trans. The transition type used by @trans. a #GESVideoTransition Get the invert property of @self, this value represents the direction of the transition. The invert value of @self The #GESVideoTransition to get the inversion from Set the border property of @self, this value represents the border width of the transition. In case this value does not make sense for the current transition type, it is cached for later use. The #GESVideoTransition to set the border to The value of the border to set on @object Set the invert property of @self, this value represents the direction of the transition. In case this value does not make sense for the current transition type, it is cached for later use. The #GESVideoTransition to set invert on %TRUE if the transition should be inverted %FALSE otherwise Sets the transition being used to @type. %TRUE if the transition type was properly changed, else %FALSE. a #GESVideoTransition a #GESVideoStandardTransitionType This value represents the border width of the transition. This value represents the direction of the transition. parent class ### Children Properties {{ libs/GESVideoUriSource-children-props.md }} The location of the file/resource to use. Clean up any resources created by GES in ges_init(). It is normally not needed to call this function in a normal application as the resources will automatically be freed when the program terminates. This function is therefore mostly used by testsuites and other memory profiling tools. This function should be called from the thread where ges_init() was called. After this call GES should not be used until another ges_init() call. A human friendly name for @edge The #GESEdge to get the name of Return a string representation of @mode. a string representation of @mode. a #GESEditMode Get the best formatter for @uri. It tries to find a formatter compatible with @uri extension, if none is found, it returns the default formatter asset. The #GESAsset for the best formatter to save to @uri GES needs to be initialized after GStreamer itself. This section contains the various functions to do so. A #GESSourceClip that overlays timing information on top. ## Asset The default asset ID is "time-overlay" (of type #GES_TYPE_SOURCE_CLIP), but the framerate and video size can be overridden using an ID of the form: ``` time-overlay, framerate=60/1, width=1920, height=1080, max-duration=5.0 ``` ## Children properties {{ libs/GESTimeOverlayClip-children-props.md }} ## Symbols GStreamer Editing Services data types The #GESUriClipAsset is a special #GESAsset that lets you handle the media file to use inside the GStreamer Editing Services. It has APIs that let you get information about the medias. Also, the tags found in the media file are set as Metadata of the Asset. Initialize the GStreamer Editing Service. Call this before any usage of GES. You should take care of initilizing GStreamer before calling this function. MT safety. GStreamer Editing Services do not guarantee MT safety. An application is required to use GES APIs (including ges_deinit()) in the thread where ges_init() was called. Initializes the GStreamer Editing Services library, setting up internal path lists, and loading evrything needed. This function will return %FALSE if GES could not be initialized for some reason. %TRUE if GES could be initialized. pointer to application's argc pointer to application's argv Returns a #GOptionGroup with GES's argument specifications. The group is set up to use standard GOption callbacks, so when using this group in combination with GOption parsing methods, all argument parsing and initialization is automated. This function is useful if you want to integrate GES with other libraries that use GOption (see g_option_context_add_group() ). If you use this function, you should make sure you initialise the GStreamer as one of the very first things in your program. That means you need to use gst_init_get_option_group() and add it to the option context before using the ges_init_get_option_group() result. a pointer to GES's option group. Use this function to check if GES has been initialized with ges_init() or ges_init_check(). %TRUE if initialization has been done, %FALSE otherwise. List all the assets in the current cache whose #GESAsset:extractable-type are of the given type (including subclasses). Note that, since only a #GESExtractable can be extracted from an asset, using `GES_TYPE_EXTRACTABLE` as @filter will return all the assets in the current cache. A list of all #GESAsset-s currently in the cache whose #GESAsset:extractable-type is of the @filter type. The type of object that can be extracted from the asset Get the last buffer @playsink showed Use the "convert-sample" action signal of #playsink instead. A #GstSample containing the last frame from @playsink in the format defined by the @caps The playsink to get last frame from The caps defining the format the return value will have Helper macro to retrieve the project from which @obj was extracted The #GESTimeline from which to retrieve the project Gets the version number of the GStreamer Editing Services library. pointer to a guint to store the major version number pointer to a guint to store the minor version number pointer to a guint to store the micro version number pointer to a guint to store the nano version number