RTCP SR only for 1 video SSRC in a multistream session

[mparis]

Hello,
I have a multistream WebRtc session with 2 streams (each one with 1 audio track and 1 video track).
In this session, Chrome is the sender of these 2 streams.

The result in terms of RTP, is that Chrome sends 4 RTP streams, each one with a SSRC (to simplify, I skip RTX ssrcs):

• ssrc-stream0-audio
  
• ssrc-stream0-video
  
• ssrc-stream1-audio
• ssrc-stream1-video
  

Moreover, Chrome sends Sender Report RTCP packets (SR).
The problem is that it sends SR packets for all audio streams, but only 1 for the video streams. In the 2 streams example:

• ssrc-stream0-audio (SR sent)
• ssrc-stream0-video (SR sent)
• ssrc-stream1-audio (SR sent)
• ssrc-stream1-video (SR NOT sent)

The same logic for 3 streams:

• ssrc-stream0-audio (SR sent)
• ssrc-stream0-video (SR sent)
• ssrc-stream1-audio (SR sent)
• ssrc-stream1-video (SR NOT sent)
• ssrc-stream2-audio (SR sent)
• ssrc-stream3-video (SR NOT sent)

Tested with:

• Chrome 48.0.2564.71
• Chrome 49.0.2612.0

Refs

• http://tools.ietf.org/html/rfc3550#section-6.4.1
  

[Peter Boström]

Mind filing a bug?

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[mparis]

Filed here: https://bugs.chromium.org/p/webrtc/issues/detail?id=5434