Re: [MMUSIC] Proposal for what bundle should say about demux
Emil Ivov <emcho@jitsi.org> Fri, 24 May 2013 15:04 UTC
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Date: Fri, 24 May 2013 18:03:53 +0300
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From: Emil Ivov <emcho@jitsi.org>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Cc: mmusic <mmusic@ietf.org>
Subject: Re: [MMUSIC] Proposal for what bundle should say about demux
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Paul, This looks very much like what I suggested initially in my response to Cullen, so I am not sure why you sound as if you are disagreeing. Emil --sent from my mobile On May 24, 2013 5:57 PM, "Paul Kyzivat" <pkyzivat@alum.mit.edu> wrote: > On 5/24/13 10:40 AM, Emil Ivov wrote: > >> On May 24, 2013 5:16 PM, "Paul Kyzivat" <pkyzivat@alum.mit.edu >> <mailto:pkyzivat@alum.mit.edu>**> wrote: >> > >> > On 5/24/13 5:14 AM, Emil Ivov wrote: >> >> >> >> On 24.05.13, 12:02, Kevin Dempsey wrote: >> >>> >> >>> I didn't say anything about changing the PTs. >> >> >> >> >> >> Sorry, I misunderstood. >> >> >> >>> The answerer decides what >> >>> it codecs it will use from the ones listed in the offer. If it >> doesn't >> >>> support any other mechanism to allow demux then it must choose codecs >> >>> that have PTs on only one m-line, or not accept the BUNDLE. >> >> >> >> >> >> Matching packets to m= lines is the concern of the receiving party. So >> >> is the mechanism that it uses. What you are suggesting is for the >> >> answerer to basically say: "It seems to me that you won't be able to >> >> demux these two payloads so I will not send them to you because I know >> >> better". >> >> >> >> In the same time the offerer may be planning on using a demux >> technique >> >> that the answerer simply isn't aware of. For example (and this is >> really >> >> just to make a point, so please don't assume I am suggesting something >> >> like this in general) if 101 is mapped to both telephone-event and >> VP8, >> >> demuxing can be easily made without any other knowledge of SSRC or >> >> header extensions. >> > >> > >> > ISTM that after the O/A exchange both sides need to have a common >> > understanding that their communications will be understandable. >> >> I assume this means you agree that an offerer has to make sure at least >> one of the demuxing mechanisms it supports will be understood by the >> answerer. >> > > No. But the offerer had better ensure that there is some way to answer > that meets the requirements. > > Then it becomes a requirement on the answerer to answer in a way that > makes the communication unambiguous. If it can't do that while bundling > then it must remove the bundle, or remove some m-lines from the bundle, or > reject some of the m-lines in the bundle, so that the resullting answer > constructs an unambiguous communication. > > If the intent is to rely on "magic" then that can be achieved by using > fewer m-lines in the bundle, in a way that dumps more streams/flows into > the same m-line. So this is really only an issue for plan A. > > Thanks, > Paul > >
- [MMUSIC] Proposal for what bundle should say abou… Cullen Jennings (fluffy)
- Re: [MMUSIC] Proposal for what bundle should say … Paul Kyzivat
- Re: [MMUSIC] Proposal for what bundle should say … Emil Ivov
- Re: [MMUSIC] Proposal for what bundle should say … Martin Thomson
- Re: [MMUSIC] Proposal for what bundle should say … Paul Kyzivat
- Re: [MMUSIC] Proposal for what bundle should say … Mo Zanaty (mzanaty)
- Re: [MMUSIC] Proposal for what bundle should say … Paul Kyzivat
- Re: [MMUSIC] Proposal for what bundle should say … Dale R. Worley
- Re: [MMUSIC] Proposal for what bundle should say … Cullen Jennings (fluffy)
- Re: [MMUSIC] Proposal for what bundle should say … Martin Thomson
- Re: [MMUSIC] Proposal for what bundle should say … Emil Ivov
- Re: [MMUSIC] Proposal for what bundle should say … Emil Ivov
- Re: [MMUSIC] Proposal for what bundle should say … Kevin Dempsey
- Re: [MMUSIC] Proposal for what bundle should say … Emil Ivov
- Re: [MMUSIC] Proposal for what bundle should say … Kevin Dempsey
- Re: [MMUSIC] Proposal for what bundle should say … Emil Ivov
- Re: [MMUSIC] Proposal for what bundle should say … Paul Kyzivat
- Re: [MMUSIC] Proposal for what bundle should say … Paul Kyzivat
- Re: [MMUSIC] Proposal for what bundle should say … Emil Ivov
- Re: [MMUSIC] Proposal for what bundle should say … Paul Kyzivat
- Re: [MMUSIC] Proposal for what bundle should say … Emil Ivov
- Re: [MMUSIC] Proposal for what bundle should say … Paul Kyzivat
- Re: [MMUSIC] Proposal for what bundle should say … Colin Perkins
- Re: [MMUSIC] Proposal for what bundle should say … Christer Holmberg
- Re: [MMUSIC] Proposal for what bundle should say … Cullen Jennings (fluffy)
- Re: [MMUSIC] Proposal for what bundle should say … Cullen Jennings (fluffy)
- Re: [MMUSIC] Proposal for what bundle should say … Colin Perkins
- Re: [MMUSIC] Proposal for what bundle should say … Paul Kyzivat
- Re: [MMUSIC] Proposal for what bundle should say … Colin Perkins
- Re: [MMUSIC] Proposal for what bundle should say … Paul Kyzivat
- Re: [MMUSIC] Proposal for what bundle should say … Colin Perkins
- Re: [MMUSIC] Proposal for what bundle should say … Paul Kyzivat
- Re: [MMUSIC] Proposal for what bundle should say … Colin Perkins
- Re: [MMUSIC] Proposal for what bundle should say … Paul Kyzivat
- Re: [MMUSIC] Proposal for what bundle should say … Mary Barnes
- Re: [MMUSIC] Proposal for what bundle should say … Cullen Jennings (fluffy)
- Re: [MMUSIC] Proposal for what bundle should say … Colin Perkins
- Re: [MMUSIC] Proposal for what bundle should say … Cullen Jennings