From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: mail.toke.dk; spf=pass (mailfrom) smtp.mailfrom=irif.fr (client-ip=2001:660:3301:8000::1:2; helo=korolev.univ-paris7.fr; envelope-from=jch@irif.fr; receiver=) Received: from korolev.univ-paris7.fr (korolev.univ-paris7.fr [IPv6:2001:660:3301:8000::1:2]) by mail.toke.dk (Postfix) with ESMTPS id 1EA6B86D884 for ; Wed, 4 Aug 2021 12:33:42 +0200 (CEST) Received: from mailhub.math.univ-paris-diderot.fr (mailhub.math.univ-paris-diderot.fr [81.194.30.253]) by korolev.univ-paris7.fr (8.14.4/8.14.4/relay1/82085) with ESMTP id 174AXgnV022908 for ; Wed, 4 Aug 2021 12:33:42 +0200 Received: from mailhub.math.univ-paris-diderot.fr (localhost [127.0.0.1]) by mailhub.math.univ-paris-diderot.fr (Postfix) with ESMTP id B0931C06D6 for ; Wed, 4 Aug 2021 12:33:42 +0200 (CEST) X-Virus-Scanned: amavisd-new at math.univ-paris-diderot.fr Received: from mailhub.math.univ-paris-diderot.fr ([127.0.0.1]) by mailhub.math.univ-paris-diderot.fr (mailhub.math.univ-paris-diderot.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id A0eqNh98uRt7 for ; Wed, 4 Aug 2021 12:33:41 +0200 (CEST) Received: from pirx.irif.fr (unknown [78.194.40.74]) (Authenticated sender: jch) by mailhub.math.univ-paris-diderot.fr (Postfix) with ESMTPSA id 4D8FAC06D3 for ; Wed, 4 Aug 2021 12:33:41 +0200 (CEST) Date: Wed, 04 Aug 2021 12:33:41 +0200 Message-ID: <87eeb9mrcq.wl-jch@irif.fr> From: Juliusz Chroboczek To: galene@lists.galene.org User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/27.1 Mule/6.0 MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (korolev.univ-paris7.fr [194.254.61.138]); Wed, 04 Aug 2021 12:33:42 +0200 (CEST) X-Miltered: at korolev with ID 610A6D06.001 by Joe's j-chkmail (http : // j-chkmail dot ensmp dot fr)! X-j-chkmail-Enveloppe: 610A6D06.001 from mailhub.math.univ-paris-diderot.fr/mailhub.math.univ-paris-diderot.fr/null/mailhub.math.univ-paris-diderot.fr/ X-j-chkmail-Score: MSGID : 610A6D06.001 on korolev.univ-paris7.fr : j-chkmail score : . : R=. U=. O=. B=0.000 -> S=0.000 X-j-chkmail-Status: Ham Message-ID-Hash: 3B4BU5WBRHXVKPHK64D3U5CF5DKNYEX6 X-Message-ID-Hash: 3B4BU5WBRHXVKPHK64D3U5CF5DKNYEX6 X-MailFrom: jch@irif.fr X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.4 Precedence: list Subject: [Galene] About VP9 SVC in Galene List-Id: =?utf-8?q?Gal=C3=A8ne_videoconferencing_server_discussion_list?= Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: 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 =AB Receive: all =BB and =AB Receive: all (low) =BB. You sh= ould 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