Re: [rtcweb] Clarification on simulcast and RID and RepairedRtpStreamId

Iñaki Baz Castillo <ibc@aliax.net> Mon, 03 December 2018 21:05 UTC

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From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= <ibc@aliax.net>
Date: Mon, 3 Dec 2018 22:05:27 +0100
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To: Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com>
Cc: Magnus Westerlund <magnus.westerlund@ericsson.com>, rtcweb@ietf.org
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Subject: Re: [rtcweb] Clarification on simulcast and RID and RepairedRtpStreamId
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On Mon, 3 Dec 2018 at 14:32, Sergio Garcia Murillo
<sergio.garcia.murillo@gmail.com> wrote:
> Given than rid is not globally unique but unique per mid, the rtx packet
> would need to include the mid anyway, wouldn't rid be redundant for
> non-simulcast use case?

All the streams (ssrcs) belonging to the same "source" and
"transceiver" should have the same MID.
MID should be used as the first demux mechanism to identify the
"source" or "transceiver".
Then inspect RID, ssrc and PT to match the exact media/RTX/FLEXFEC stream.


-- 
Iñaki Baz Castillo
<ibc@aliax.net>