Re: [MMUSIC] SDP work needed for WebRTC stuff

Bernard Aboba <> Mon, 10 December 2012 08:31 UTC

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From: Bernard Aboba <>
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Date: Mon, 10 Dec 2012 00:31:56 -0800
To: Harald Alvestrand <>
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Subject: Re: [MMUSIC] SDP work needed for WebRTC stuff
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I agree that accelerated progress in MMUSIC should be a goal. If there are enough cycles to spare, monthly virtual interims might do the trick.  This is a painful way to go about it, but it has worked before (MARTINI) and concentrated pain now is preferable to years of chronic aches.

On Dec 9, 2012, at 23:57, "Harald Alvestrand" <> wrote:
> I agree that these are the important topics that need to be settled, and agree that it's urgent to settle them.
> I'm willing to spend time going to interims (virtual or physical, although I have a preference for is virtual) if there's any sign of them being useful to progress.
> I would like to see us move on these issues before the RTCWEB interim in early February, if possible.
> On 12/08/2012 11:41 PM, Cullen Jennings (fluffy) wrote:
>> I was looking over everything that needs to be completed to finish a fist cut of the WebRTC related work. There are a handful of big SDP problems that are currently blocking some of the WebRTC work and I'd like to figure out how to make some progress on them.
>> Let me loosely characterize them as
>> 1) If we have several video streams, how do theses map up to 1 or more m lines.
>> 2) if we are doing port multiplexing, what does the SDP look like (the bundle problem)
>> 3) How do we map the RTCWeb track and stream label concepts to identifiers in SDP
>> 3) SDP for application running over SCTP/DTLS
>> I don't want to speak for all the various chairs but I am under the impression that most of chairs of related groups in W3C and IETF believe these are issues that need to be resolved primarily in the MMUSIC WG and that they impact both WebRTC and CLUE as well as the general long term use of SDP in SIP and other protocols.
>> I'd like to get some discussion going on how we can make some progress on these. I don't think we are going to solve these in 20 minutes of discussion at an IETF meeting so I think we probably need some interim (virtual or face to face) to sort this out.
>> Thoughts?
>> Cullen <in my individual contributor role>
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