[Webkit-unassigned] [Bug 257803] Terrible video quality when using TransformStream with Simulcast

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=257803

--- Comment #4 from pminchev at digitalsamba.com ---
(In reply to youenn fablet from comment #2)
> @pminchev, do you have a test site where the issue can be reproduced?
> What WebRTC logs do you get on the sending side?

Yes, https://demos.digitalsamba.com/safari_simulcast.html
Just enter some random name and click join.

You need at least 2 people from Safari in the room, since the local video preview doesn't go through the media servers, only the subscribed videos. Of course you can just open 2 browser tabs if you don't want to ask a second person to join. A heavy pixelation is soon observed for the consumed streams. It fixes itself for a few seconds, then it appears again - kind of random. Also as I mentioned in the original description - the M simulcast layer often disappears and L layer with a > 7000 seconds jitter appears.

Note this demo uses end-to-end encryption, but even without it, we experience the same issues - the moment TransformStream is used with simulcast.

I am also attaching some WebRTC logs, hope they are helpful.

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