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Re: [rtcweb] Drop RFC 4588 RTX session multiplexing support requirement from RTP USAGE

Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com> Mon, 27 October 2014 16:41 UTC

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Date: Mon, 27 Oct 2014 17:40:38 +0100
From: Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com>
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To: Colin Perkins <csp@csperkins.org>
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Subject: Re: [rtcweb] Drop RFC 4588 RTX session multiplexing support requirement from RTP USAGE
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On 27/10/2014 17:36, Colin Perkins wrote:
> Hi,
>
> On 21 Oct 2014, at 19:58, Sergio Garcia Murillo 
> <sergio.garcia.murillo@gmail.com 
> <mailto:sergio.garcia.murillo@gmail.com>> wrote:
>> Not sure if it is done on pourpose, but according to the RTP usage 
>> draft, it may seem that full RFC 4588 is mandated at the recevier side:
>>
>>      Receivers are REQUIRED to implement support for RTP retransmission
>>      packets [RFC4588  <https://tools.ietf.org/html/rfc4588>].
>>
>> That would include both modes, session and ssrc multiplexing. Given 
>> the extensive usage of bundle and current implementations, session 
>> multiplexing support doesn't make much sense.
>>
>> Should we drop it, and state that only ssrc-multiplexing shall be 
>> supported at the receiving end?
>
> I don’t see any advantage to doing so, given that support for 
> non-BUNDLE sessions is REQUIRED. You need to implement the signalling 
> needed for session-multiplexing of retransmission packet anyway, so 
> disallowing it buys you nothing.
>

You can do SSRC multiplexing with BUNDLE and non-BUNDLE sessions, what I 
don't see is how to do session multiplexing with BUNDLE sessions.

Best regards
Sergio

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