Re: [MMUSIC] Proposal for what bundle should say about demux
Emil Ivov <emcho@jitsi.org> Fri, 24 May 2013 09:15 UTC
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Date: Fri, 24 May 2013 12:14:51 +0300
From: Emil Ivov <emcho@jitsi.org>
Organization: Jitsi
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To: Kevin Dempsey <kevindempsey70@gmail.com>
References: <C5E08FE080ACFD4DAE31E4BDBF944EB11350F3C8@xmb-aln-x02.cisco.com> <519E80E4.6010904@jitsi.org> <519E9131.2080400@alum.mit.edu> <519F1424.8020803@jitsi.org> <CAMvTgcdpz5dh2zxRGu_xu1QdqsdAapgT-zziT5GzyzyodQxYXA@mail.gmail.com> <519F2BD8.8060803@jitsi.org> <CAMvTgcfx1t0d-NEavTxdq=9FEH9Z-wjX2S+HcSimFUgzg5-58g@mail.gmail.com>
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Cc: mmusic <mmusic@ietf.org>, Paul Kyzivat <pkyzivat@alum.mit.edu>
Subject: Re: [MMUSIC] Proposal for what bundle should say about demux
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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. Cheers, Emil > > > On 24 May 2013 09:59, Emil Ivov <emcho@jitsi.org > <mailto:emcho@jitsi.org>> wrote: > > On 24.05.13, 11:40, Kevin Dempsey wrote: > > Isn't the onus on the answerer to ensure the demux is possible, > since it > > is accepting the bundle. Therefore if it doesn't support signalling > > SSRCs or an offerred 'fancy-RFC m-line matching' method, it must only > > send PTs that are tied to a single m-line. > > PTs are defined by the offerer. The answerer cannot change them for the > offerer-bound direction (even if it could request different values for > the packets that it, the answerer, is going to receive). > > Emil > > > > > > > > On 24 May 2013 08:17, Emil Ivov <emcho@jitsi.org > <mailto:emcho@jitsi.org> > > <mailto:emcho@jitsi.org <mailto:emcho@jitsi.org>>> wrote: > > > > On 24.05.13, 00:59, Paul Kyzivat wrote: > > > IMO the "before the O/A completes" issues are separate from > the "after > > > the O/A completes" issues. I'm still not convinced that the > > "before the > > > O/A completes" issues are important. (We have reliable 183 > > responses to > > > deal with it.) But I'm ok with Cullen using PT to solve that > > problem if > > > he thinks he needs to. > > > > I wasn't referring to "before the O/A completes" situations. > If your > > peer does not support fancy-RFC m-line matching nor does it > provide > > SSRCs, you have to be able to fall back to PT demuxing. > > > > Therefore, all your offers have to accommodate for that > possibility > > unless you know that the offer is going to someone who also > supports > > other mechanisms. > > > > Emil > > > > -- > > https://jitsi.org > > _______________________________________________ > > mmusic mailing list > > mmusic@ietf.org <mailto:mmusic@ietf.org> > <mailto:mmusic@ietf.org <mailto:mmusic@ietf.org>> > > https://www.ietf.org/mailman/listinfo/mmusic > > > > > > -- > https://jitsi.org > > -- https://jitsi.org
- [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 … Colin Perkins
- 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 … 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