Re: [MMUSIC] FW: [rtcweb] How to signal RTX SSRCs with simulcast

Bo Burman <bo.burman@ericsson.com> Mon, 13 March 2017 13:42 UTC

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From: Bo Burman <bo.burman@ericsson.com>
To: =?utf-8?B?ScOxYWtpIEJheiBDYXN0aWxsbw==?= <ibc@aliax.net>
Thread-Topic: [MMUSIC] FW: [rtcweb] How to signal RTX SSRCs with simulcast
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Date: Mon, 13 Mar 2017 13:41:14 +0000
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Subject: Re: [MMUSIC] FW: [rtcweb] How to signal RTX SSRCs with simulcast
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> -----Original Message-----
> From: Iñaki Baz Castillo [mailto:ibc@aliax.net]
> Sent: den 13 mars 2017 12:50
> 
> 2017-03-13 12:41 GMT+01:00 Bo Burman <bo.burman@ericsson.com>om>:
> > Could you elaborate a bit to help me understand why that would be needed for FLEX-FEC when using
> RepairedRtpStreamId?
> 
> I just meant that, in case of option A above, FLEX-FEC would require the same as RTX (when RID is in use and ssrcs are
> therefore not signaled).
[BoB] OK

> 
> 
> > I guess that use of RtpStreamId or RepairedRtpStreamId on RTP level (in the RTP and RTCP packets) should not matter
> much, neither for FLEX-FEC nor RTX, as long as it is clearly defined what it means?
> 
> I'm not against it. It's just that this requires a new draft about RID and "complementary streams" (or include it into
> existing ones).
[BoB] Usage of RepairedRtpStreamId and RtpStreamId are already defined on RTP level by -avtext-rid. If we have preferences on how to best use them with redundancy RTP streams in general, I suggest we add text to -mmusic-rid about it. This would be regardless if we go for option A or B, but decided once and for all, thus applicable to RFC 4588 rtx and FLEX-FEC alike.

/Bo
(as individual)

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