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Re: [rtcweb] JSEP question: How to set up simulcast for server-originated calls?

Harald Alvestrand <harald@alvestrand.no> Thu, 08 November 2018 09:46 UTC

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From: Harald Alvestrand <harald@alvestrand.no>
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Date: Thu, 08 Nov 2018 10:46:11 +0100
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Subject: Re: [rtcweb] JSEP question: How to set up simulcast for server-originated calls?
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On 11/07/2018 01:00 PM, Iñaki Baz Castillo wrote:
> On Wed, 7 Nov 2018 at 12:48, Stefan Håkansson LK
> <stefan.lk.hakansson@ericsson.com> wrote:
>> An non inspected SDP offer/answer can influence _how_ it is sent, but I
>> think that is per design - no point in encoding with an encoder that
>> the remote can't decode etc.
> I can buy that argument when it comes to just that: codec and RTCP
> interoperability. Ok, WebRTC 1.0 assumes that app developers cannot
> correlate capabilities in JS so the browser does it auto-magically.
>
> But here we are talking about simulcast, which consumes resources and
> requires more network uplink. And I want to control what my app sends
> (and its max bitrate) because sending 3 streams instead of just 1
> means more CPU usage, battery and bandwidth (money).
>
> A received UFO should not change that.

Inaki, you're attacking a proposal that has not been made.

We have long ago defined the API that lets the local application control
*exactly* what simulcast can be sent.
What the SDP controls is telling the local browser (and application)
what the other end is willing to accept.

>
>

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