Overview: I seems like Safari TP 33 has no support for simulcast streaming, which would be required for multiparty scenarios. This is supported in Chrome and Firefox for VP8 and there is a patch in progress to add support also for H.264 [1] The standard way to add simulcast support would be using RtpSender encodings + RID header extensions in the RTP packets [2] Actual Result: There is no way to enable simulcast in Safari for H.264. Expected Result: Safari supports simulcast for H.264 (and also VP8 if support for that is eventually added) Build Date & Hardware: Safari TP 33 on macOS 10.12.5 [1] https://bugs.chromium.org/p/webrtc/issues/detail?id=5840 [2] https://www.w3.org/TR/webrtc/#simulcast-example
<rdar://problem/32713416>
FYI, there's an "Intent to Implement and Ship: Simulcast with PeerConnection AddTranceiver API in WebRTC" for this on blink-dev now: https://groups.google.com/a/chromium.org/d/msg/blink-dev/N31xFKvgbck/h5G0a9RqAQAJ
Simulcast activation through munging is supported. The plan is to transition to addTransceiver
Created attachment 418257 [details] Patch
Committed r271797: <https://trac.webkit.org/changeset/271797> All reviewed patches have been landed. Closing bug and clearing flags on attachment 418257 [details].