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

Magnus Westerlund <magnus.westerlund@ericsson.com> Tue, 04 December 2018 09:58 UTC

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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
To: Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com>, Iñaki Baz Castillo <ibc@aliax.net>
CC: "rtcweb@ietf.org" <rtcweb@ietf.org>
Thread-Topic: [rtcweb] Clarification on simulcast and RID and RepairedRtpStreamId
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Date: Tue, 04 Dec 2018 09:57:50 +0000
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Subject: Re: [rtcweb] Clarification on simulcast and RID and RepairedRtpStreamId
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On 2018-12-04 10:35, Sergio Garcia Murillo wrote:
> On 03/12/2018 22:26, Iñaki Baz Castillo wrote:
>> On Mon, 3 Dec 2018 at 22:22, Sergio Garcia Murillo
>> <sergio.garcia.murillo@gmail.com> wrote:
>>> 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?
>> Regardless what browsers do today, both MID and RID headers should be
>> just included in the first packets. The receiver is supposed to update
>> its ssrc table for faster matching.
>>
>> NOTE: The sender should also resend MID and RID if the SSRC changed
>> because some RFCs state that SSRCs may conflict and things that
>> absolutely never happen.
>>
> Kind of agree, but from a theoretical point of view remember that we 
> introduced MIDs/RIDs to cover rtp proxing/switching scenarios in which 
> ssrc conflicts may happen, so in order to cover those scenarios the 
> MIDs/RIDs values must be included in every packet. If we ignore that, 
> then could just go back to ssrc signaling and avoid mids/rids 
> completely, which I would be in favor of.
>
However, an RTP middlebox has the freedom to introduce those header
extensions when switching. They do not need to be sent end-to-end all
the time. So after the initial establishment of them, I see it as the
central middlebox responsibility to ensure that they are included in the
down stream legs towards the conference participants. Also at least for
video introducing them only on reception of a FIR also makes sense.

Cheers 

Magnus Westerlund 

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