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hlssink3: Update README

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Mention newly added hlscmafsink element and new properties

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1306>
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Seungha Yang 2023-09-06 00:36:55 +09:00
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@ -3,16 +3,34 @@ A GStreamer HLS sink plugin. Based on the
["hlssink2"](https://gstreamer.freedesktop.org/documentation/hls/hlssink2.html?gi-language=c) ["hlssink2"](https://gstreamer.freedesktop.org/documentation/hls/hlssink2.html?gi-language=c)
element. element.
The "hlssink3" is feature-equivalent to the "hlssink2" element. Any pipeline that uses "hlssink2" can use the The `hlssink3` plugin consists of `hlssink3` and `hlscmafsink` elements.
"hlssink3" element and the result should be the same. `hlssink3` element generates traditional MPEG-TS based HLS segments
and playlist while `hlscmafsink` generates `CMAF` (fragmented mp4)
segments.
The "hlssink3" element has a `playlist-type` property used to control the behavior of the HLS playlist file. The **NOTE**: `hlssink3` element is feature-equivalent to the `hlssink2` element.
Any pipeline that uses `hlssink2` can use the `hlssink3` element
and the result should be the same.
Both elements have a `playlist-type` property used to control the behavior of the HLS playlist file. The
available values for this property are: available values for this property are:
- `null` (default): The tag `#EXT-X-PLAYLIST-TYPE` won't be present in the playlist during the pipeline processing. The - `null` (default): The tag `#EXT-X-PLAYLIST-TYPE` won't be present in the playlist during the pipeline processing. The
playlist will be updated in sync as new segments are available, old segments are removed, keeping N segments as playlist will be updated in sync as new segments are available, old segments are removed, keeping N segments as
defined in the property `playlist-length`. This is the default behavior, and is compatible with how "hlssink2" works; defined in the property `playlist-length`. This is the default behavior, and is compatible with how "hlssink2" works;
- `"event"`: The playlist is updated as new segments are available, and the tag `#EXT-X-PLAYLIST-TYPE:EVENT` is present - `"event"`: The playlist is updated as new segments are available, and the tag `#EXT-X-PLAYLIST-TYPE:EVENT` is present
during processing. No segments will be removed from the playlist. At the end of the processing, the tag during processing. No segments will be removed from the playlist.
`#EXT-X-ENDLIST` is added to the playlist;
- `"vod"`: The playlist behaves like the `event` option (a live event), but at the end of the processing, the playlist - `"vod"`: The playlist behaves like the `event` option (a live event), but at the end of the processing, the playlist
will be set to `#EXT-X-PLAYLIST-TYPE:VOD`. will be set to `#EXT-X-PLAYLIST-TYPE:VOD`.
At the end of the processing, `#EXT-X-ENDLIST` is added to the playlist
if a `enable-endlist` property is enabled (default is `true`).
## Live playlist generation
In case of live recording with multiple playlists,
the `#EXT-X-PROGRAM-DATE-TIME` tags can be useful hint for clients
when mapping each stream time to the wall-clock.
The `#EXT-X-PROGRAM-DATE-TIME` tags will be written to the playlist
if `enable-program-date-time` property is enabled.