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Re: [MMUSIC] Text proposal for Bundle regarding Associating RTP/RTCP With Correct SDP Media Description

Jonathan Lennox <jonathan@vidyo.com> Wed, 01 February 2017 20:03 UTC

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From: Jonathan Lennox <jonathan@vidyo.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>
Thread-Topic: [MMUSIC] Text proposal for Bundle regarding Associating RTP/RTCP With Correct SDP Media Description
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Date: Wed, 01 Feb 2017 20:03:21 +0000
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Cc: Magnus Westerlund <magnus.westerlund@ericsson.com>, "draft-ietf-rtcweb-jsep@tools.ietf.org" <draft-ietf-rtcweb-jsep@tools.ietf.org>, "rtcweb@ietf.org" <rtcweb@ietf.org>, mmusic <mmusic@ietf.org>, "draft-ietf-mmusic-sdp-bundle-negotiation@ietf.org" <draft-ietf-mmusic-sdp-bundle-negotiation@ietf.org>
Subject: Re: [MMUSIC] Text proposal for Bundle regarding Associating RTP/RTCP With Correct SDP Media Description
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Well, yes, clearly if the source is sent with a PT that isn’t in any m-line in the bundle, or with a PT that’s non-unique and isn’t in the m-line it’s currently associated with, it’s an error.

The question was whether we wanted to treat the unique PT case specially, but I can appreciate Magnus’s argument that we shouldn’t.

I’d like to hear comment from the folks who’ve been arguing in favor of PT-based mapping, though.  (I get the feeling that Magnus is agreeing to it only grudgingly.)

> On Feb 1, 2017, at 2:43 PM, Christer Holmberg <christer.holmberg@ericsson.com> wrote:
> 
> Hi,
> 
>>> I have one question, however.  What should happen if an RTP packet 
>>> (without a MID) is received for a stream that has an existing mapping 
>>> to an m= line, but whose PT is not valid for that m= line?
> 
> I don't think that case is specific to BUNDLE, is it? It could happen even without multiplexing.
> 
> I agree with Magnus that it should be treated as an error.
> 
> (There could even be cases where the PT isn't valid for ANY m- line).
> 
> Regards,
> 
> Christer

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