Re: [AVTCORE] BUNDLE and same payload type in different "bundled" m= lines
Iñaki Baz Castillo <ibc@aliax.net> Thu, 10 March 2016 22:45 UTC
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From: Iñaki Baz Castillo <ibc@aliax.net>
Date: Thu, 10 Mar 2016 23:44:40 +0100
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To: Bernard Aboba <bernard.aboba@gmail.com>
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Subject: Re: [AVTCORE] BUNDLE and same payload type in different "bundled" m= lines
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2016-03-09 23:29 GMT+01:00 Bernard Aboba <bernard.aboba@gmail.com>: > [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>
- [AVTCORE] BUNDLE and same payload type in differe… Iñaki Baz Castillo
- Re: [AVTCORE] BUNDLE and same payload type in dif… Magnus Westerlund
- Re: [AVTCORE] BUNDLE and same payload type in dif… Bernard Aboba
- Re: [AVTCORE] BUNDLE and same payload type in dif… Iñaki Baz Castillo
- Re: [AVTCORE] BUNDLE and same payload type in dif… Roni Even
- Re: [AVTCORE] BUNDLE and same payload type in dif… Iñaki Baz Castillo
- Re: [AVTCORE] BUNDLE and same payload type in dif… Magnus Westerlund
- Re: [AVTCORE] BUNDLE and same payload type in dif… Iñaki Baz Castillo
- Re: [AVTCORE] BUNDLE and same payload type in dif… Christer Holmberg