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Re: [rtcweb] A proposal for FEC

Justin Uberti <juberti@google.com> Mon, 19 May 2014 16:38 UTC

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From: Justin Uberti <juberti@google.com>
Date: Mon, 19 May 2014 09:37:52 -0700
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To: Magnus Westerlund <magnus.westerlund@ericsson.com>
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Subject: Re: [rtcweb] A proposal for FEC
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Sounds like a plan.




On Mon, May 19, 2014 at 9:01 AM, Magnus Westerlund <
magnus.westerlund@ericsson.com> wrote:

> On 2014-05-19 11:58, Bernard Aboba wrote:
> >>
> >> On May 19, 2014, at 11:33 AM, Magnus Westerlund <
> magnus.westerlund@ericsson.com> wrote:
> >>
> >> I think adding ULPFEC in WebRTC is reasonable, however despite what RFC
> >> 5956 says, we do have a spec issue with the following part of RFC 5109
> >> that will be required to be overridden:
> >>
> >> Section 7.2:
> >>
> >>   Synchronization Source (SSRC): The SSRC value SHALL be the same as
> >>   the SSRC value of the media stream it protects.
> >>
> >> Section 14.1:
> >>
> >>   The SSRC of the FEC stream MUST
> >>   be set to that of the protected payload stream.
> >>
> >>   So the FEC
> >>   stream and the payload stream SHOULD be sent through two separate RTP
> >>   session, and multiplexing them by payload type into one single RTP
> >>   session SHOULD be avoided.  In addition, the FEC and the payload MUST
> >>   NOT be multiplexed by SSRC into one single RTP session since they
> >>   always have the same SSRC.
> >>
> >>> From my perspective this override should be done in a separate document
> >> so that also others can use it and not being RTCWEB specific.
> >
> > The following draft accomplishes this, no?
> > http://tools.ietf.org/html/draft-lennox-payload-ulp-ssrc-mux
> >
>
> Yes, but it needs some updates and polishing before ready for
> publication. Also, it has not been adopted yet in any WG. But, I think
> adopting it and getting it moved forward in an expedited fashion would
> be the right way forward.
>
> Cheers
>
> Magnus Westerlund
>
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