NEW217860
5.1 audio received over WebRTC is downmixed to stereo 
https://bugs.webkit.org/show_bug.cgi?id=217860
Summary 5.1 audio received over WebRTC is downmixed to stereo
Justin Uberti
Reported 2020-10-16 18:23:18 PDT
When receiving 5.1 channel Opus content over WebRTC, all channels are received and decoded but downmixed to stereo, even when a 5.1-compatible sound card is connected. <audio/> tags, on the other hand, do render 5.1 content properly, e.g., https://www2.iis.fraunhofer.de/AAC/multichannel.html. This suggests that somewhere along the line a mixer is not being initialized with the right number of channels. I looked through the playout path and didn't see anything obvious, but I didn't investigate closely.
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Radar WebKit Bug Importer
Comment 1 2020-10-17 09:38:43 PDT
<rdar://problem/70408614>
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