[jitsi-dev] Having questions about SDP(s) sent to video bridge when simulcast.


#1

Hi Experts,

I have a question about how many SDPs Chrome sends to the video bridge in
case of simulcast?
And I don't see in the setLocal/RemoteDescription set any max-fs for frame
size/resolution, do we set it anywhere else?

If it sends two SDPs, do the two specify one for large resolution video
while the other specifies the small resolution video?

Best,
Yisheng


#2

Hi Yisheng,

Hi Experts,

I have a question about how many SDPs Chrome sends to the video bridge in
case of simulcast?

Enabling simulcast doesn't change the negotiation steps.

And I don't see in the setLocal/RemoteDescription set any max-fs for frame
size/resolution, do we set it anywhere else?

max-fs is not used in Chrome simulcast signaling nor in COLIBRI
simulcast signaling (which follows closely the Chrome simulcast
signaling).

If it sends two SDPs, do the two specify one for large resolution video
while the other specifies the small resolution video?

The simulcast formats are hardcoded into the webrtc.org enine so you
don't have much control over the actual resolutions, but they're
reasonably chosen. Also, we have recently updated the simulcast
documentation, you might want to have a look at that
https://github.com/jitsi/jitsi-videobridge/blob/master/doc/simulcast.md.

Best,
George

ยทยทยท

On Fri, Dec 11, 2015 at 05:03:14PM -0500, Yisheng Yang wrote:

Best,
Yisheng

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