Doesn't work on firefox. Chrome works fine

[ghost]

It seems that selkies-gstreamer will stuck on Waiting for video stream on Firefox 96.

The status message only shows
``
[19:0:0] [signalling] Connecting to server.
[19:0:2] [signalling] Registering with server, peer ID: 1
[19:0:4] [signalling] Registered with server.
[19:0:4] [signalling] Waiting for video stream.
[19:0:6] [webrtc] [ERROR] attempt to send data channel message before channel was open.
[19:0:6] [webrtc] Received incoming video stream from peer
[19:0:6] [webrtc] Received incoming audio stream from peer
[19:0:7] [webrtc] [ERROR] attempt to send data channel message before channel was open.

``

[xhejtman]

This is because remote SDP offer contains H264 video while firefox responds with VP8 reply. gstreamer gives up in this case.

[ehfd]

https://www.plumislandmedia.net/something-i-learned/firefox-has-limited-ability-to-handle-h-264/
Probably associated with this.

[ehfd]

https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1106
https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/issues/691

This is the upstream issue with the remote SDP offer in GStreamer's webrtcbin. Keep monitoring this. However, the separate issue with the H.264 Constrained Baseline Profile will likely also be an issue.

Much more information related to GStreamer and WebRTC:
http://www.francescpinyol.cat/gstreamer.html
http://www.francescpinyol.cat/webrtc.html

[ehfd]

More references:
https://stackoverflow.com/questions/70652697/webrtc-using-gstreamer-and-webrtcbin-works-with-vp9-but-not-with-h264
https://stackoverflow.com/questions/68060965/simple-webrtc-webpage-works-well-in-chrome-and-safari-but-not-in-firefox
https://groups.google.com/g/mozilla.dev.media/c/Ye29vuMTpo8
This might indicate that the high profile may work when the above is fixed?:
https://bugzilla.mozilla.org/show_bug.cgi?id=1755361