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Re: [rtcweb] A problem with both A and B

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 20 May 2013 06:48 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Martin Thomson <martin.thomson@gmail.com>, Bernard Aboba <bernard_aboba@hotmail.com>
Thread-Topic: [rtcweb] A problem with both A and B
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Date: Mon, 20 May 2013 06:48:09 +0000
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Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: Re: [rtcweb] A problem with both A and B
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Hi,

I don't think it's a BUNDLE issue whether adding/removing of streams require an O/A exchange or not. It's an SDP, and SDP O/A, issue.

BUNDLE is about sharing a 5-tuple.

Regards,

Christer


-----Original Message-----
From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of Martin Thomson
Sent: 17. toukokuuta 2013 23:50
To: Bernard Aboba
Cc: rtcweb@ietf.org
Subject: Re: [rtcweb] A problem with both A and B

> "Dale R. Worley" <worley@ariadne.com> wrote:
>    DES F11  It must be possible to add and remove one way video flows
>       within the bundle without requiring an additional offer/answer
>       cycle.

I'm not sure why this speaks specifically about video...

On 17 May 2013 13:21, Bernard Aboba <bernard_aboba@hotmail.com> wrote:
> It is important. In fact, I would argue it is critical for congestion control (e.g. removal of simulcast or layered streams by the sender should not require an O/A exchange).

This is different I think.  Responding to congestion only requires that it be possible to stop sending a given stream.  (Or maybe crank down resolution or frame rate.)

This item talks about addition.  That's an entirely different proposition.  As long as we assume constraints (you don't need to re-ICE a new transport for the stream, you don't use new packet types and codec profiles), this could be possible.  But to get WebRTC to support this requires API changes.
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