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webrtcsink: Added sample LiveKit simulcast to readme

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Jordan Yelloz 2024-02-12 09:24:10 -07:00
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net/webrtc/README.md
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@ -350,6 +350,35 @@ gst-launch-1.0 -e uridecodebin uri=file:///home/meh/path/to/video/file ! \
You should see a second video displayed in the videoroomtest web page.
### Simulcasts with LiveKit
Video streams of differing qualities can be combined into a single simulcast
track which allows LiveKit to send different versions to the receiving clients
independently based on their network connection and preferences. LiveKit is
specific about using the RID values `q`, `h`, and `f` to represent quarter-,
half-, and full-size streams. This creates a simulcast with all 3 sizes:
```shell
gst-launch-1.0 \
livekitwebrtcsink name=sink \
signaller::ws-url=ws://localhost:7880 \
signaller::api-key=devkey \
signaller::secret-key=secret \
signaller::room-name=test \
signaller::identity=gst-simulcast \
signaller::participant-name=gst-simulcast \
video-caps=video/x-h264 \
video_0::mid=track0 \
video_1::mid=track0 \
video_2::mid=track0 \
video_0::rid=q \
video_1::rid=h \
video_2::rid=f \
videotestsrc is-live=1 ! video/x-raw,framerate=15/1,width=320,height=180 ! videoconvert ! x264enc bitrate=300 key-int-max=120 b-adapt=false vbv-buf-capacity=120 tune=zerolatency speed-preset=ultrafast threads=4 ! video/x-h264,profile=baseline ! h264parse config-interval=-1 ! queue ! sink.video_0 \
videotestsrc is-live=1 ! video/x-raw,framerate=30/1,width=640,height=360 ! videoconvert ! x264enc bitrate=600 key-int-max=120 b-adapt=false vbv-buf-capacity=120 tune=zerolatency speed-preset=ultrafast threads=4 ! video/x-h264,profile=baseline ! h264parse config-interval=-1 ! queue ! sink.video_1 \
videotestsrc is-live=1 ! video/x-raw,framerate=30/1,width=1280,height=720 ! videoconvert ! x264enc bitrate=3000 key-int-max=120 b-adapt=false vbv-buf-capacity=120 tune=zerolatency speed-preset=ultrafast threads=4 ! video/x-h264,profile=baseline ! h264parse config-interval=-1 ! queue ! sink.video_2
```
## Streaming from LiveKit using the livekitwebrtcsrc element
First, publish a stream to the room using the following command: