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Re: [Moq] Fwd: New Version Notification for draft-dawkins-sdp-rtp-quic-questions-01.txt

Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com> Wed, 27 October 2021 15:37 UTC

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From: Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com>
Date: Wed, 27 Oct 2021 17:36:43 +0200
Message-ID: <CA+ag07YDWFguHXYC7FznLAbi4aVHW5Ynb96KCd+2cUyhS+c=Eg@mail.gmail.com>
To: Bernard Aboba <bernard.aboba@gmail.com>
Cc: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>, MOQ Mailing List <moq@ietf.org>
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Subject: Re: [Moq] Fwd: New Version Notification for draft-dawkins-sdp-rtp-quic-questions-01.txt
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El mié., 27 oct. 2021 17:02, Bernard Aboba <bernard.aboba@gmail.com>
escribió:

> Sergio said:
>
> "We should only support RTP over quick datagram, what about
> webtransport support?"
>
> [BA] Currently there are issues with WebTransport support for Web realtime
> communications in the client -> server direction, summarized here:
>
> https://docs.google.com/presentation/d/1SG1FUvn9UKGx_gAqWnCzPHlsIXkDUXctZPs7blfqS5k/
>
> While the metrics issue is unique to WebTransport, the issues with QUIC
> congestion control will also affect realtime media directly over QUIC.  The
> biggest issue is slow recovery of media quality after packet loss. Without
> probing similar to what is done in WebRTC today, recovering media quality
> will be slow, particularly when simulcast or SVC is used.
>

With RTP over QUIC we can do probing and bwe as in WebRTC. The main issue
is how the rtp bwe and the quic congestion control interact when running
simultaneously,  as we would get the worse of both worlds. Typically could
be bypassed by the native quic apps by removing the quic congestion control
and rely on the rtp bwe instead.

This approach however won't work for webtransport on browsers as the rtp
bwe would be done in the app js and the browser can't trust the js app to
do the right thing.

Best regards
Sergio

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