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

[Iñaki Baz Castillo <[e-mail]>]

May be, but without knowing in advance the limit in different
devices/browsers, how many rids do you expect those SFUs will place in the
offer? It would be the "lowest common denominator" which would not satisfy
to anyone.

El lun., 5 nov. 2018 14:17, Sergio Garcia Murillo <
[e-mail]> escribió:

> if remote offer has more rids than what the browser support then the m
> line should be rejected.
>
>
> El lun., 5 nov. 2018 14:14, Iñaki Baz Castillo <[e-mail]> escribió:
>
>> As Harlad said before, sender.getParameters() should not return more
>> times than the number of encodings the browser supports, so of the remote
>> offer has more than those, we have an API problem.
>>
>> El lun., 5 nov. 2018 14:03, Sergio Garcia Murillo <
>> [e-mail]> escribió:
>>
>>> On 05/11/2018 12:45, Harald Alvestrand wrote:
>>> > I do fear that simulcast will continue to affect parts of the spec that
>>> > we don't expect it to. But we don't have the luxury of specifying it
>>> > halfway; either we rip it out altogether, or we specify it in enough
>>> > detail for interoperable implementation.
>>>
>>> I agree to that. If we are able to find an "easy" (i.e. not introducing
>>> too many changes) I would not have any issues adding support to that.
>>>
>>> Something like:
>>>
>>> - Browser adds a track via addTrack
>>>
>>> - Browser call SRD with a recv simulcast m-line offer
>>>
>>> - The transceiver is created with one send encoding per rid offered by
>>> the SFU with default values and all send encodings except first one with
>>> active=false (this would be the only required change)
>>>
>>> ----- browser encodes/sends a single rtp stream, same as if the remote
>>> offer was a non simulcast stream--
>>>
>>> -Browser calls sender.getParameters(), modifies the desired send
>>> encoding parameters ( scaleResolutionDownBy,  maxFramerate, maxBitrate,
>>> etc) and enables them by setting active=true
>>>
>>> Would this approach fulfill the requirements?
>>>
>>> Best regards
>>>
>>> Sergio
>>>
>>>
>>>