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Re: [MMUSIC] BUNDLE: no reason por payload type to be unique within bundled m= lines

Peter Thatcher <pthatcher@google.com> Wed, 09 March 2016 23:52 UTC

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From: Peter Thatcher <pthatcher@google.com>
Date: Wed, 09 Mar 2016 15:51:25 -0800
Message-ID: <CAJrXDUGvvmiLRnywEZ6GHUC2xrjJ9528c1w4TpH9VV5Ov04ebQ@mail.gmail.com>
To: Colin Perkins <csp@csperkins.org>
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Cc: Christer Holmberg <christer.holmberg@ericsson.com>, "mmusic@ietf.org" <mmusic@ietf.org>, Magnus Westerlund <magnus.westerlund@ericsson.com>
Subject: Re: [MMUSIC] BUNDLE: no reason por payload type to be unique within bundled m= lines
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On Wed, Mar 9, 2016 at 3:35 PM, Colin Perkins <csp@csperkins.org> wrote:

>
> > On 8 Mar 2016, at 23:34, Iñaki Baz Castillo <ibc@aliax.net> wrote:
> >
> > 2016-03-08 20:05 GMT+01:00 Christer Holmberg <
> christer.holmberg@ericsson.com>:
> >> When we discussed payload type mappings and RTP sessions, it was said
> that, in a sendonly m- line, the payload type values are simply "place
> holders", the remote endpoint will tell you what values it want to receive.
> >>
> >> So, in your case, you can't say "I am going to send you with PT 100".
> The answerer is going to say what it wants to receive, so in your case it
> may e.g. chose 98 for alice-audio and 99 for bob-audio.
> >
> > So I tell you that I will send N codecs with SSRC 1234 and you tell me
> > which payload I should use. This makes no sense IMHO. SDP was designed
> > for 1-to-1 symmetric (audio) streams.
>
> No, SDP was designed to advertise multiparty multicast conferences on the
> Mbone, in declarative mode, using SAP for session discovery. Use with SIP
> and offer/answer came later.
>
>
​So that's how we got into this m... I mean, thanks for the tidbit of
history.  It's inter​esting.  Do you have link to a place where the history
is written down?  If not, could you right it down?  I'm seriously
interested to know the history a bit to know how we got here.



> > When it comes to multi-stream (I
> > send my audio and video and receive multiple audio and video streams
> > from others) SDP becomes a nightmare.
> >
> >
> > --
> > Iñaki Baz Castillo
> > <ibc@aliax.net>
> >
> > _______________________________________________
> > mmusic mailing list
> > mmusic@ietf.org
> > https://www.ietf.org/mailman/listinfo/mmusic
>
>
>
> --
> Colin Perkins
> https://csperkins.org/
>
>
>
>
> _______________________________________________
> mmusic mailing list
> mmusic@ietf.org
> https://www.ietf.org/mailman/listinfo/mmusic
>

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