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

Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com> Mon, 03 December 2018 21:22 UTC

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Cc: Magnus Westerlund <magnus.westerlund@ericsson.com>, rtcweb@ietf.org
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From: Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com>
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Date: Mon, 3 Dec 2018 22:26:22 +0100
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rtcweb/PLmIhwyrM-C9SXNAmFYVOEGTQy8>
Subject: Re: [rtcweb] Clarification on simulcast and RID and RepairedRtpStreamId
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On 03/12/2018 22:05, Iñaki Baz Castillo wrote:
> 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.
>
My point is that there is a single source in the transceiver/MID why 
should we add default RID and waste 2 more bytes in each media and rtx 
packet?


Best regards

Sergio