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tools: gst-launch: improve content and formatting
This commit is contained in:
Reynaldo H. Verdejo Pinochet
parent
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commit
76a492c467
1 changed files with 317 additions and 206 deletions
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@ -1,35 +1,35 @@
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# gst-launch-1.0
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> ![information] This is the Linux man page for
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> ![information] This content comes mostly from the Linux man page for
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> the `gst-launch-1.0` tool. As such, it is very Linux-centric
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> regarding path specification and plugin names. Please be patient while
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> it is rewritten to be more generic.
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## Name
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gst-launch-1.0 - build and run a GStreamer pipeline
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`gst-launch-1.0` - build and run a GStreamer pipeline
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## Synopsis
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**gst-launch-1.0** *\[OPTION...\]* PIPELINE-DESCRIPTION
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```
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gst-launch-1.0 [OPTIONS] PIPELINE-DESCRIPTION
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```
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## Description
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*gst-launch-1.0* is a tool that builds and runs
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basic *GStreamer* pipelines.
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`gst-launch-1.0` is a tool that builds and runs basic *GStreamer* pipelines.
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In simple form, a PIPELINE-DESCRIPTION is a list of elements separated
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by exclamation marks (!). Properties may be appended to elements, in the
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form*property=value*.
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In its simplest form, a PIPELINE-DESCRIPTION is a list of elements separated
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by exclamation marks (!). Properties may be appended to elements in the
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form `property=value`.
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For a complete description of possible PIPELINE-DESCRIPTIONS see the
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section*pipeline description* below or consult the GStreamer
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documentation.
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For a more complete description of possible PIPELINE-DESCRIPTIONS see the
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section *pipeline description* below or consult the GStreamer documentation.
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Please note that *gst-launch-1.0* is primarily a debugging tool for
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developers and users. You should not build applications on top of it.
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For applications, use the gst\_parse\_launch() function of the GStreamer
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API as an easy way to construct pipelines from pipeline descriptions.
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Please note that `gst-launch-1.0` is primarily a debugging tool. You should
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not build applications on top of it. For applications, use the
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`gst_parse_launch()` function of the GStreamer API as an easy way to construct
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pipelines from pipeline descriptions.
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## Options
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@ -68,300 +68,411 @@ Do not install a fault handler
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Print memory allocation traces. The feature must be enabled at compile
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time to work.
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## Gstreamer Options
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*gst-launch-1.0* also accepts the following options that are common to
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`gst-launch-1.0` also accepts the following options that are common to
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all GStreamer applications:
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## Pipeline Description
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A pipeline consists *elements* and *links*. *Elements* can be put
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into *bins* of different sorts. *Elements*, *links* and *bins* can be
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A pipeline consists *elements* and *links*. *elements* can be put
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into *bins* of different sorts. *elements*, *links* and *bins* can be
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specified in a pipeline description in any order.
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**Elements**
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### Elements
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ELEMENTTYPE *\[PROPERTY1 ...\]*
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```
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ELEMENTTYPE [PROPERTY1 ...]
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```
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Creates an element of type ELEMENTTYPE and sets the PROPERTIES.
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Creates an element of type `ELEMENTTYPE` and sets its `PROPERTIES`.
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**Properties**
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### Element Properties
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```
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PROPERTY=VALUE ...
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```
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Sets the property to the specified value. You can
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use **gst-inspect-1.0**(1) to find out about properties and allowed
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values of different elements. Enumeration properties can be set by name,
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nick or value.
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Sets the property to the specified value. You can use `gst-inspect-1.0` to find
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out about properties and allowed values of different elements. Enumeration
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properties can be set by name, nick or value.
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**Bins**
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### Bins
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*\[BINTYPE.\]* ( *\[PROPERTY1 ...\]* PIPELINE-DESCRIPTION )
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```
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[BINTYPE.] ([PROPERTY1 ...] PIPELINE-DESCRIPTION)
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```
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Specifies that a bin of type BINTYPE is created and the given properties
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Specifies that a bin of type `BINTYPE` is created and the given properties
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are set. Every element between the braces is put into the bin. Please
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note the dot that has to be used after the BINTYPE. You will almost
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note the dot that has to be used after the `BINTYPE`. You will almost
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never need this functionality, it is only really useful for applications
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using the gst\_launch\_parse() API with 'bin' as bintype. That way it is
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using the `gst_parse_launch()` API with 'bin' as bintype. That way it is
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possible to build partial pipelines instead of a full-fledged top-level
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pipeline.
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**Links**
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### Links
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*\[\[SRCELEMENT\].\[PAD1,...\]\]* ! *\[\[SINKELEMENT\].\[PAD1,...\]\]
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\[\[SRCELEMENT\].\[PAD1,...\]\]* ! CAPS
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! *\[\[SINKELEMENT\].\[PAD1,...\]\]*
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```
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[[SRCELEMENT\].[PAD1,...]] ! [[SINKELEMENT].[PAD1,...]]
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```
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Links the element with name SRCELEMENT to the element with name
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SINKELEMENT, using the caps specified in CAPS as a filter. Names can be
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set on elements with the name property. If the name is omitted, the
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element that was specified directly in front of or after the link is
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used. This works across bins. If a padname is given, the link is done
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with these pads. If no pad names are given all possibilities are tried
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and a matching pad is used. If multiple padnames are given, both sides
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must have the same number of pads specified and multiple links are done
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in the given order. So the simplest link is a simple exclamation mark,
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that links the element to the left of it to the element right of it.
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Links the element with name SRCELEMENT to the element with name SINKELEMENT.
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Names can be set on elements using the `name` property. If the name is omitted,
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the element that was specified directly in front of or after the link is
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used. This works across bins. If a padname is given, the link is done using that
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pad. If no pad names are given all possibilities are tried and a compatible pad
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is used. If multiple padnames are given, both sides must have the same number of
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pads specified and multiple links are done in the given order. The simplest link
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is a simple exclamation mark. This links the element to the left of it with the
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element at its right.
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**Caps**
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MIMETYPE *\[, PROPERTY\[, PROPERTY ...\]\]\] \[; CAPS\[; CAPS ...\]\]*
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The following links the element with name SRCELEMENT to the element with name
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SINKELEMENT, using the caps specified in CAPS as a filter:
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```
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[[SRCELEMENT].[PAD1,...]] ! CAPS ! [[SINKELEMENT].[PAD1,...]]
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```
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### Caps
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```
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MIMETYPE [, PROPERTY[, PROPERTY ...]]] [; CAPS[; CAPS ...]]
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```
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Creates a capability with the given mimetype and optionally with given
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properties. The mimetype can be escaped using " or '. If you want to
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properties. The mimetype can be escaped using `"` or `'`. If you want to
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chain caps, you can add more caps in the same format afterwards.
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**Properties**
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### Caps Properties
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NAME=*\[(TYPE)\]*VALUE in lists and ranges: *\[(TYPE)\]*VALUE
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```
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NAME=[(TYPE)] VALUE in lists and ranges: [(TYPE)] VALUE
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```
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Sets the requested property in capabilities. The name is an alphanumeric
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value and the type can have the following case-insensitive values:
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- **i** or **int** for integer values or ranges - **f** or **float** for
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float values or ranges - **4** or **fourcc** for FOURCC values
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- **b**, **bool** or **boolean** for boolean values
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- **s**, **str** or **string** for strings - **fraction** for fractions
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(framerate, pixel-aspect-ratio) - **l** or **list** for lists If no type
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was given, the following order is tried: integer, float, boolean,
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string. Integer values must be parsable by **strtol()**, floats
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by **strtod()**. FOURCC values may either be integers or strings.
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Boolean values are (case insensitive) *yes*, *no*, *true* or *false* and
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may like strings be escaped with " or '. Ranges are in this format: \[
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VALUE, VALUE \] Lists use this format: ( VALUE *\[, VALUE ...\]* )
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(framerate, pixel-aspect-ratio)
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- **l** or **list** for lists If no type was given, the following order is
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tried: integer, float, boolean, string. Integer values must be parsable by
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**strtol()**, floats by **strtod()**. FOURCC values may either be integers or
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strings. Boolean values are (case insensitive) *yes*, *no*, *true* or *false*
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and may like strings be escaped with `"` or `'`. Ranges are in this format: `[
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VALUE, VALUE] Lists use this format: (VALUE [, VALUE ...])`
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## Pipeline Control
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A pipeline can be controlled by signals. SIGUSR2 will stop the pipeline
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(GST\_STATE\_NULL); SIGUSR1 will put it back to play
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(GST\_STATE\_PLAYING). By default, the pipeline will start in the
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playing state. There are currently no signals defined to go into the
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ready or pause (GST\_STATE\_READY and GST\_STATE\_PAUSED) state
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explicitely.
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A pipeline can be controlled by signals. `SIGUSR2` will stop the pipeline
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(`GST_STATE_NULL`); `SIGUSR1` will put it back to play (`GST_STATE_PLAYING`). By
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default, the pipeline will start in the `PLAYING` state. There are currently no
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signals defined to go into the ready or pause (`GST_STATE_READY` and `GST_STATE_PAUSED`) states explicitly.
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## Pipeline Examples
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The examples below assume that you have the correct plug-ins available.
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In general, "osssink" can be substituted with another audio output
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plug-in such as "directsoundsink", "esdsink", "alsasink",
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"osxaudiosink", or "artsdsink". Likewise, "xvimagesink" can be
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substituted with "d3dvideosink", "ximagesink", "sdlvideosink",
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"osxvideosink", or "aasink". Keep in mind though that different sinks
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might accept different formats and even the same sink might accept
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different formats on different machines, so you might need to add
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converter elements like audioconvert and audioresample (for audio) or
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videoconvert (for video) in front of the sink to make things work.
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The examples below assume that you have the correct plugins available.
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In general, `osssink` can be substituted with another audio output
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plugin such as `directsoundsink`, `esdsink`, `alsasink`, `osxaudiosink`, or
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`artsdsink`. Likewise, `xvimagesink` can be substituted with `d3dvideosink`,
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`ximagesink`, `sdlvideosink`, `osxvideosink`, or `aasink`. Keep in mind though
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that different sinks might accept different formats and even the same sink might
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accept different formats on different machines, so you might need to add
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converter elements like `audioconvert` and `audioresample` for audio or
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`videoconvert` in front of the sink to make things work.
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**Audio playback**
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### Audio playback
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`gst-launch-1.0 filesrc location=music.mp3 ! mad ! audioconvert !
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audioresample ! osssink` Play the mp3 music file "music.mp3" using a
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libmad-based plug-in and output to an OSS device
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Play the mp3 music file "music.mp3" using a libmad-based plugin and output to
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an OSS device:
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`gst-launch-1.0 filesrc location=music.ogg ! oggdemux ! vorbisdec !
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audioconvert ! audioresample ! osssink` Play an Ogg Vorbis format file
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```
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gst-launch-1.0 filesrc location=music.mp3 ! mad ! audioconvert !
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audioresample ! osssink
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```
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`gst-launch-1.0 gnomevfssrc location=music.mp3 ! mad ! osssink
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Play an Ogg Vorbis format file:
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```
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gst-launch-1.0 filesrc location=music.ogg ! oggdemux ! vorbisdec !
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audioconvert ! audioresample ! osssink
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```
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Play an mp3 file using GNOME-VFS:
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```
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gst-launch-1.0 gnomevfssrc location=music.mp3 ! mad ! osssink
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```
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Play an HTTP stream using GNOME-VFS:
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```
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gst-launch-1.0 gnomevfssrc location=<http://domain.com/music.mp3> ! mad
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! audioconvert ! audioresample ! osssink` Play an mp3 file or an http
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stream using GNOME-VFS
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! audioconvert ! audioresample ! osssink
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```
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`gst-launch-1.0 gnomevfssrc location=<smb://computer/music.mp3> ! mad !
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audioconvert ! audioresample ! osssink` Use GNOME-VFS to play an mp3
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file located on an SMB server
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Use GNOME-VFS to play an mp3 file located on an SMB server:
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**Format conversion**
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```
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gst-launch-1.0 gnomevfssrc location=<smb://computer/music.mp3> ! mad !
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audioconvert ! audioresample ! osssink
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```
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`gst-launch-1.0 filesrc location=music.mp3 ! mad ! audioconvert !
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vorbisenc ! oggmux ! filesink location=music.ogg` Convert an mp3 music
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file to an Ogg Vorbis file
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### Format conversion
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`gst-launch-1.0 filesrc location=music.mp3 ! mad ! audioconvert !
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flacenc ! filesink location=test.flac` Convert to the FLAC format
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Convert an mp3 music file to an Ogg Vorbis file:
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**Other**
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```
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gst-launch-1.0 filesrc location=music.mp3 ! mad ! audioconvert ! vorbisenc !
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oggmux ! filesink location=music.ogg
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```
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`gst-launch-1.0 filesrc location=music.wav ! wavparse ! audioconvert !
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audioresample ! osssink` Plays a .WAV file that contains raw audio data
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(PCM).
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Convert to the FLAC format:
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`gst-launch-1.0 filesrc location=music.wav ! wavparse ! audioconvert !
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vorbisenc ! oggmux ! filesink location=music.ogg gst-launch-1.0 filesrc
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location=music.wav ! wavparse ! audioconvert ! lame ! filesink
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location=music.mp3` Convert a .WAV file containing raw audio data into
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an Ogg Vorbis or mp3 file
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```
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gst-launch-1.0 filesrc location=music.mp3 ! mad ! audioconvert ! flacenc !
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filesink location=test.flac`
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```
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`gst-launch-1.0 cdparanoiasrc mode=continuous ! audioconvert ! lame !
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id3v2mux ! filesink location=cd.mp3` rips all tracks from compact disc
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and convert them into a single mp3 file
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### Other
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`gst-launch-1.0 cdparanoiasrc track=5 ! audioconvert ! lame ! id3v2mux
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! filesink location=track5.mp3` rips track 5 from the CD and converts
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it into a single mp3 file
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Play a .WAV file that contains raw audio data (PCM):
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Using **gst-inspect-1.0**(1), it is possible to discover settings like
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the above for cdparanoiasrc that will tell it to rip the entire cd or
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only tracks of it. Alternatively, you can use an URI and gst-launch-1.0
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```
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gst-launch-1.0 filesrc location=music.wav ! wavparse ! audioconvert !
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audioresample ! osssink
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```
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Convert a .WAV file containing raw audio data into an Ogg Vorbis or mp3 file:
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```
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gst-launch-1.0 filesrc location=music.wav ! wavparse ! audioconvert !
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vorbisenc ! oggmux ! filesink location=music.ogg
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```
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```
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gst-launch-1.0 filesrc location=music.wav ! wavparse ! audioconvert ! lame !
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filesink location=music.mp3
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```
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Rip all tracks from CD and convert them into a single mp3 file:
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```
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gst-launch-1.0 cdparanoiasrc mode=continuous ! audioconvert ! lame !
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id3v2mux ! filesink location=cd.mp3
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```
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Rip track 5 from the CD and converts it into a single mp3 file:
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```
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gst-launch-1.0 cdparanoiasrc track=5 ! audioconvert ! lame ! id3v2mux
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! filesink location=track5.mp3
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```
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Using `gst-inspect-1.0`, it is possible to discover settings like
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the above for cdparanoiasrc that will tell it to rip the entire CD or
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only tracks of it. Alternatively, you can use an URI and `gst-launch-1.0`
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will find an element (such as cdparanoia) that supports that protocol
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for you, e.g.: `gst-launch-1.0 \[cdda://5\] ! lame vbr=new
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vbr-quality=6 ! filesink location=track5.mp3`
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for you, e.g.:
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`gst-launch-1.0 osssrc ! audioconvert ! vorbisenc ! oggmux ! filesink
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location=input.ogg` records sound from your audio input and encodes it
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into an ogg file
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```
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gst-launch-1.0 [cdda://5] ! lame vbr=new vbr-quality=6 !
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filesink location=track5.mp3
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```
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**Video**
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Record sound from your audio input and encode it into an ogg file:
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`gst-launch-1.0 filesrc location=JB\_FF9\_TheGravityOfLove.mpg !
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dvddemux ! mpeg2dec ! xvimagesink` Display only the video portion of an
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MPEG-1 video file, outputting to an X display window
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```
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gst-launch-1.0 osssrc ! audioconvert ! vorbisenc ! oggmux !
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filesink location=input.ogg
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```
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`gst-launch-1.0 filesrc location=/flflfj.vob ! dvddemux ! mpeg2dec !
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sdlvideosink` Display the video portion of a .vob file (used on DVDs),
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outputting to an SDL window
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### Video
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`gst-launch-1.0 filesrc location=movie.mpg ! dvddemux name=demuxer
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demuxer. ! queue ! mpeg2dec ! sdlvideosink demuxer. ! queue ! mad !
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audioconvert ! audioresample ! osssink` Play both video and audio
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portions of an MPEG movie
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Display only the video portion of an MPEG-1 video file, outputting to an X
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display window:
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`gst-launch-1.0 filesrc location=movie.mpg ! mpegdemux name=demuxer
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demuxer. ! queue ! mpeg2dec ! videoconvert ! sdlvideosink demuxer. !
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queue ! mad ! audioconvert ! audioresample ! osssink` Play an AVI movie
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with an external text subtitle stream
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```
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gst-launch-1.0 filesrc location=videofile.mpg ! dvddemux ! mpeg2dec !
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xvimagesink
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```
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This example also shows how to refer to specific pads by name if an
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element (here: textoverlay) has multiple sink or source pads.
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Display the video portion of a .vob file (used on DVDs), outputting to an SDL
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window:
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`gst-launch-1.0 textoverlay name=overlay ! videoconvert !
|
||||
videoscale ! autovideosink filesrc location=movie.avi ! decodebin2 !
|
||||
videoconvert ! overlay.video\_sink filesrc location=movie.srt !
|
||||
subparse ! overlay.text\_sink`
|
||||
```
|
||||
gst-launch-1.0 filesrc location=flflfj.vob ! dvddemux ! mpeg2dec ! sdlvideosink
|
||||
```
|
||||
|
||||
Play an AVI movie with an external text subtitle stream using playbin
|
||||
Play both video and audio portions of an MPEG movie:
|
||||
|
||||
`gst-launch-1.0 playbin uri=<file:///path/to/movie.avi>
|
||||
suburi=<file:///path/to/movie.srt>`
|
||||
```
|
||||
gst-launch-1.0 filesrc location=movie.mpg ! dvddemux name=demuxer
|
||||
demuxer. ! queue ! mpeg2dec ! sdlvideosink
|
||||
demuxer. ! queue ! mad ! audioconvert ! audioresample ! osssink
|
||||
```
|
||||
|
||||
**Network streaming**
|
||||
Play an AVI movie with an external text subtitle stream:
|
||||
|
||||
Stream video using RTP and network elements.
|
||||
```
|
||||
gst-launch-1.0 filesrc location=movie.mpg ! mpegdemux name=demuxer
|
||||
demuxer. ! queue ! mpeg2dec ! videoconvert ! sdlvideosink
|
||||
demuxer. ! queue ! mad ! audioconvert ! audioresample ! osssink
|
||||
```
|
||||
|
||||
`gst-launch-1.0 v4l2src !
|
||||
This example shows how to refer to specific pads by name if an
|
||||
element (here: textoverlay) has multiple sink or source pads:
|
||||
|
||||
```
|
||||
gst-launch-1.0 textoverlay name=overlay ! videoconvert ! videoscale !
|
||||
autovideosink
|
||||
filesrc location=movie.avi ! decodebin2 ! videoconvert ! overlay.video_sink
|
||||
filesrc location=movie.srt ! subparse ! overlay.text_sink
|
||||
```
|
||||
|
||||
Play an AVI movie with an external text subtitle stream using playbin:
|
||||
|
||||
```
|
||||
gst-launch-1.0 playbin uri=<file:///path/to/movie.avi>
|
||||
suburi=<file:///path/to/movie.srt>
|
||||
```
|
||||
|
||||
### Network streaming
|
||||
|
||||
Stream video using RTP and network elements
|
||||
|
||||
This command would be run on the transmitter:
|
||||
|
||||
```
|
||||
gst-launch-1.0 v4l2src !
|
||||
video/x-raw-yuv,width=128,height=96,format='(fourcc)'UYVY !
|
||||
videoconvert ! ffenc\_h263 ! video/x-h263 ! rtph263ppay pt=96 !
|
||||
udpsink host=192.168.1.1 port=5000 sync=false` Use this command on the
|
||||
receiver
|
||||
videoconvert ! ffenc_h263 ! video/x-h263 ! rtph263ppay pt=96 !
|
||||
udpsink host=192.168.1.1 port=5000 sync=false
|
||||
```
|
||||
|
||||
`gst-launch-1.0 udpsrc port=5000 ! application/x-rtp,
|
||||
clock-rate=90000,payload=96 ! rtph263pdepay queue-delay=0 ! ffdec\_h263
|
||||
! xvimagesink` This command would be run on the transmitter
|
||||
Use this command on the receiver:
|
||||
|
||||
**Diagnostic**
|
||||
```
|
||||
gst-launch-1.0 udpsrc port=5000 ! application/x-rtp,
|
||||
clock-rate=90000,payload=96 ! rtph263pdepay queue-delay=0 ! ffdec_h263
|
||||
! xvimagesink
|
||||
```
|
||||
|
||||
`gst-launch-1.0 -v fakesrc num-buffers=16 ! fakesink` Generate a null
|
||||
stream and ignore it (and print out details).
|
||||
### Diagnostic
|
||||
|
||||
`gst-launch-1.0 audiotestsrc ! audioconvert ! audioresample ! osssink`
|
||||
Generate a pure sine tone to test the audio output
|
||||
Generate a null stream and ignore it (and print out details):
|
||||
|
||||
`gst-launch-1.0 videotestsrc ! xvimagesink gst-launch-1.0 videotestsrc
|
||||
! ximagesink` Generate a familiar test pattern to test the video output
|
||||
```
|
||||
gst-launch-1.0 -v fakesrc num-buffers=16 ! fakesink
|
||||
```
|
||||
|
||||
**Automatic linking**
|
||||
Generate a pure sine tone to test the audio output:
|
||||
|
||||
```
|
||||
gst-launch-1.0 audiotestsrc ! audioconvert ! audioresample ! osssink
|
||||
```
|
||||
|
||||
Generate a familiar test pattern to test the video output:
|
||||
|
||||
```
|
||||
gst-launch-1.0 videotestsrc ! ximagesink
|
||||
```
|
||||
|
||||
### Automatic linking
|
||||
|
||||
You can use the decodebin element to automatically select the right
|
||||
elements to get a working pipeline.
|
||||
|
||||
`gst-launch-1.0 filesrc location=musicfile ! decodebin ! audioconvert !
|
||||
audioresample ! osssink` Play any supported audio format
|
||||
Play any supported audio format:
|
||||
|
||||
`gst-launch-1.0 filesrc location=videofile ! decodebin name=decoder
|
||||
decoder. ! queue ! audioconvert ! audioresample ! osssink decoder. !
|
||||
videoconvert ! xvimagesink` Play any supported video format with
|
||||
video and audio output. Threads are used automatically. To make this
|
||||
even easier, you can use the playbin element:
|
||||
```
|
||||
gst-launch-1.0 filesrc location=musicfile ! decodebin ! audioconvert !
|
||||
audioresample ! osssink
|
||||
```
|
||||
|
||||
`gst-launch-1.0 playbin uri=<file:///home/joe/foo.avi>`
|
||||
Play any supported video format with video and audio output. Threads are used
|
||||
automatically:
|
||||
|
||||
**Filtered connections**
|
||||
```
|
||||
gst-launch-1.0 filesrc location=videofile ! decodebin name=decoder
|
||||
decoder. ! queue ! audioconvert ! audioresample ! osssink
|
||||
decoder. ! videoconvert ! xvimagesink
|
||||
```
|
||||
|
||||
To make the above even easier, you can use the playbin element:
|
||||
|
||||
```
|
||||
gst-launch-1.0 playbin uri=<file:///home/joe/foo.avi>
|
||||
```
|
||||
|
||||
### Filtered connections
|
||||
|
||||
These examples show you how to use filtered caps.
|
||||
|
||||
`gst-launch-1.0 videotestsrc !
|
||||
'video/x-raw-yuv,format=(fourcc)YUY2;video/x-raw-yuv,format=(fourcc)YV12'
|
||||
! xvimagesink` Show a test image and use the YUY2 or YV12 video format
|
||||
for this.
|
||||
Show a test image and use the YUY2 or YV12 video format for this:
|
||||
|
||||
`gst-launch-1.0 osssrc !
|
||||
'audio/x-raw-int,rate=\[32000,64000\],width=\[16,32\],depth={16,24,32},signed=(boolean)true'
|
||||
! wavenc ! filesink location=recording.wav` record audio and write it
|
||||
to a .wav file. Force usage of signed 16 to 32 bit samples and a sample
|
||||
rate between 32kHz and 64KHz.
|
||||
```
|
||||
gst-launch-1.0 videotestsrc !
|
||||
'video/x-raw-yuv,format=(fourcc)YUY2;video/x-raw-yuv,format=(fourcc)YV12'
|
||||
! xvimagesink
|
||||
```
|
||||
|
||||
Record audio and write it to a .wav file. Force usage of signed 16 to 32 bit
|
||||
samples and a sample rate between 32kHz and 64KHz:
|
||||
|
||||
```
|
||||
gst-launch-1.0 osssrc !
|
||||
'audio/x-raw-int,rate=[32000,64000],width=[16,32],depth={16,24,32},signed=(boolean)true'
|
||||
! wavenc ! filesink location=recording.wav
|
||||
```
|
||||
|
||||
## Environment Variables
|
||||
|
||||
`GST\_DEBUG`: Comma-separated list of debug categories and levels,
|
||||
e.g. GST\_DEBUG= totem:4,typefind:5
|
||||
`GST_DEBUG`: Comma-separated list of debug categories and levels, e.g:
|
||||
|
||||
`GST\_DEBUG\_NO\_COLOR`: When this environment variable is set,
|
||||
coloured debug output is disabled.
|
||||
```
|
||||
GST_DEBUG=totem:4,typefind:5
|
||||
```
|
||||
|
||||
`GST\_DEBUG\_DUMP\_DOT\_DIR`: When set to a filesystem path, store dot
|
||||
`GST_DEBUG_NO_COLOR`: When this environment variable is set, coloured debug
|
||||
output is disabled. This might come handy when saving the debug output to a
|
||||
file.
|
||||
|
||||
`GST_DEBUG_DUMP_DOT_DIR`: When set to a filesystem path, store dot
|
||||
files of pipeline graphs there.
|
||||
|
||||
`GST\_REGISTRY`: Path of the plugin registry file. Default is
|
||||
\~/.gstreamer-1.0/registry-CPU.xml where CPU is the machine/cpu type
|
||||
`GST_REGISTRY`: Path of the plugin registry file. The default is
|
||||
`~/.gstreamer-1.0/registry-CPU.xml` where CPU is the machine/cpu type
|
||||
GStreamer was compiled for, e.g. 'i486', 'i686', 'x86-64', 'ppc', etc.
|
||||
(check the output of "uname -i" and "uname -m" for details).
|
||||
Check the output of `uname -i` and `uname -m` for details.
|
||||
|
||||
`GST\_REGISTRY\_UPDATE`: Set to "no" to force GStreamer to assume that
|
||||
no plugins have changed, been added or been removed. This will make
|
||||
GStreamer skip the initial check whether a rebuild of the registry cache
|
||||
is required or not. This may be useful in embedded environments where
|
||||
the installed plugins never change. Do not use this option in any other
|
||||
setup.
|
||||
`GST_REGISTRY_UPDATE`: Set to "no" to force GStreamer to assume that no plugins
|
||||
have changed, have been added or have been removed. This will make GStreamer
|
||||
skip the initial check to determine whether a rebuild of the registry cache is
|
||||
required or not. This may be useful in embedded environments where the installed
|
||||
plugins never change. Do not use this option in any other setup.
|
||||
|
||||
`GST\_PLUGIN\_PATH`: Specifies a list of directories to scan for
|
||||
additional plugins. These take precedence over the system plugins.
|
||||
`GST_PLUGIN_PATH`: Specifies a list of directories to scan for additional
|
||||
plugins. These take precedence over the system plugins.
|
||||
|
||||
`GST\_PLUGIN\_SYSTEM\_PATH`: Specifies a list of plugins that are
|
||||
always loaded by default. If not set, this defaults to the
|
||||
system-installed path, and the plugins installed in the user's home
|
||||
directory
|
||||
`GST_PLUGIN_SYSTEM_PATH`: Specifies a list of plugins that are always loaded by
|
||||
default. If not set, this defaults to the system-installed path, and the plugins
|
||||
installed in the user's home directory
|
||||
|
||||
`OIL\_CPU\_FLAGS`: Useful liboil environment variable. Set
|
||||
OIL\_CPU\_FLAGS=0 when valgrind or other debugging tools trip over
|
||||
liboil's CPU detection (quite a few important GStreamer plugins like
|
||||
videotestsrc, audioconvert or audioresample use liboil).
|
||||
`OIL_CPU_FLAGS`: Useful liboil environment variable. Set `OIL_CPU_FLAGS=0` when
|
||||
valgrind or other debugging tools trip over liboil's CPU detection. Quite a few
|
||||
important GStreamer plugins like `videotestsrc`, `audioconvert` and
|
||||
`audioresample` use liboil.
|
||||
|
||||
`G\_DEBUG`: Useful GLib environment variable. Set
|
||||
G\_DEBUG=fatal\_warnings to make GStreamer programs abort when a
|
||||
critical warning such as an assertion failure occurs. This is useful if
|
||||
you want to find out which part of the code caused that warning to be
|
||||
triggered and under what circumstances. Simply set G\_DEBUG as mentioned
|
||||
above and run the program in gdb (or let it core dump). Then get a stack
|
||||
trace in the usual way
|
||||
`G_DEBUG`: This is a useful GLib environment variable. Set
|
||||
`G_DEBUG=fatal_warnings` to make GStreamer programs abort when a critical
|
||||
warning such as an assertion failure occurs. This is useful if you want to find
|
||||
out which part of the code caused that warning to be triggered and under what
|
||||
circumstances. Simply set `G_DEBUG` as mentioned above and run the program under
|
||||
gdb (or let it core dump). Then get a stack trace in the usual way.
|
||||
|
||||
[information]: images/icons/emoticons/information.png
|
||||
|
|
|
|||
Loading…
Reference in a new issue