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 > > ---------------------------------------------------------------------- > Services, Media and Network features, Ericsson Research EAB/TXM > ---------------------------------------------------------------------- > Ericsson AB | Phone +46 10 7148287 > Färögatan 6 | Mobile +46 73 0949079 > SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com > ---------------------------------------------------------------------- > >
- [rtcweb] A proposal for FEC Justin Uberti
- Re: [rtcweb] A proposal for FEC Stefan Håkansson LK
- Re: [rtcweb] A proposal for FEC Magnus Westerlund
- Re: [rtcweb] A proposal for FEC Varun Singh
- Re: [rtcweb] A proposal for FEC Bernard Aboba
- Re: [rtcweb] A proposal for FEC Magnus Westerlund
- Re: [rtcweb] A proposal for FEC Justin Uberti
- Re: [rtcweb] A proposal for FEC Jonathan Lennox
- Re: [rtcweb] A proposal for FEC Suhas Nandakumar
- Re: [rtcweb] A proposal for FEC Magnus Westerlund