Re: [webrtc-insertable-streams] Does Chromium require anything in SDP or RTP Header to make this work? (#37)

In some cases you may need to enable the GFD extension.
Currently, you can do that on the command line or by munging SDP.

Command line:
--force-fieldtrials=WebRTC-GenericDescriptorAdvertised/Enabled

For a possible munging, see: https://cs.chromium.org/chromium/src/third_party/blink/web_tests/fast/peerconnection/RTCPeerConnection-insertable-streams.js?q=insertable-streams.js&sq=package:chromium&dr&l=57

A Web Platform API is proposed to make it easier to control RTP Header extensions:
https://w3c.github.io/webrtc-extensions/

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