From: Juliusz Chroboczek <jch@irif.fr> To: galene@lists.galene.org Subject: [Galene] About VP9 SVC in Galene Date: Wed, 04 Aug 2021 12:33:41 +0200 [thread overview] Message-ID: <87eeb9mrcq.wl-jch@irif.fr> (raw) Hi, I've spent the last two nights implementing spatial VP9 SVC in Galene (temporal was already working fine). I think it's correct, although not quite optimal. In order to test, set up a group with VP9, enable simulcast, and then toggle between « Receive: all » and « Receive: all (low) ». You should see the quality change without any visible artefacts and with no renegotiation. (It is normal to see a temporary degradation in quality, due to the second point below.) Two issues. First, once in a while Chromium's rate estimator gets stuck in a state where it's sending a very low data rate; the only fix appears to be to restart the stream. I've spent hours trying to debug the issue, and I don't see anything wrong with my code. Second, we're not parsing the dependency descriptor, which means that we cannot switch seamlessly at arbitrary points. The result is that we require a keyframe when a switch is required, which causes extra traffic and a visible degradation in stream quality. I think this is good enough for 0.4, especially as we currently tend to prefer temporal degradation when we're congested. -- Juliusz
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