Re: [AVTCORE] BUNDLE and same payload type in different "bundled" m= lines

"Roni Even" <ron.even.tlv@gmail.com> Thu, 10 March 2016 22:53 UTC

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From: "Roni Even" <ron.even.tlv@gmail.com>
To: =?UTF-8?Q?'I=C3=B1aki_Baz_Castillo'?= <ibc@aliax.net>, "'Bernard Aboba'" <bernard.aboba@gmail.com>
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Date: Fri, 11 Mar 2016 00:53:14 +0200
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Subject: Re: [AVTCORE] BUNDLE and same payload type in different "bundled" m= lines
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Hi,
I assume that "legacy" endpoints will not support bundle so they will use different transport addresses for each m-line having different RTP sessions

Roni

> -----Original Message-----
> From: avt [mailto:avt-bounces@ietf.org] On Behalf Of I?aki Baz Castillo
> Sent: Friday, March 11, 2016 12:45 AM
> To: Bernard Aboba
> Cc: avt@ietf.org
> Subject: Re: [AVTCORE] BUNDLE and same payload type in different
> "bundled" m= lines
> 
> 2016-03-09 23:29 GMT+01:00 Bernard Aboba <bernard.aboba@gmail.com>om>:
> > [BA] What specific text in BUNDLE mandates this? In particular, the VP8
> decoder can decode anything that the encoder can send, so the streams
> from the different participants do not require unique decoder settings. So
> AFAICT the SFU could send N streams to a given participant, each using
> PT=100, but with N distinct SSRCs.
> 
> At the end it happens that RFC 3550 (RTP) defines "RTP session" as all the
> stuff sent by an RTP participant over a specific transport (5-tuple), and it
> mandates PT to be unique within a "RTP session".
> 
> Due to that, it seems that legacy middleboxes/endpoints just take the PT to
> identify codecs.
> 
> Then BUNDLE arrives and a "RTP session" no longer identifies a single
> transport for a single RTP participant. But legacy systems still assume that, so
> PT must remain unique.
> 
> I don't yet understand why the same PT value can be used for different
> bundled streams if they refer to the same codec+configuration, since those
> PTs now belong to different streams. But I don't care too much about that.
> 
> 
> --
> Iñaki Baz Castillo
> <ibc@aliax.net>
> 
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