What steps will reproduce the problem?
1. Set remote description with an offer of audio/video.
2. Add a second video stream stream on the other end.
3. Set remote description with updated sdp, also including an "a=msid" attribute for compatibility with Firefox.

What is the expected result?

onaddstream should fire a second time, this time with the new stream.


What do you see instead?

onaddstream never fires for the updated remote description.


What version of the product are you using? On what operating system?

M50


Please provide any additional information below.

https://jsfiddle.net/vdr3at78/

The "a=misd" attribute causes Chrome to interpret the second track as belonging to the same stream, even though "a=ssrc:... msid:" attributes identify the new stream.