Created attachment 459955 [details] fx-rt-profiler-part-a.webm STR: - Open the attached file in current Safari (Version 15.4 17613.1.17.1.6) or Safari Technology Preview (Release 146, Safari 15.4, WebKit 17614.1.14.10.6). It's also live on a page at https://blog.paul.cx/post/profiling-firefox-real-time-media-workloads/#the-new-solution Expected: - It plays Actual: - It doesn't play. The console reports: "Failed to load resource: PLugin-in handled load". - I can reproduce this on both an x86_64 and ARM MacBook Pro running Monterey 12.3. - Firefox, Chrome and all native media players that I've tested play the file ffprobe on the file: > Input #0, matroska,webm, from 'fx-rt-profiler-part-a.webm': > Metadata: > COM.APPLE.QUICKTIME.SOFTWARE: Mac OS X 10.15.5 (19F101) > MAJOR_BRAND : qt > MINOR_VERSION : 0 > COMPATIBLE_BRANDS: qt > COM.APPLE.QUICKTIME.CREATIONDATE: 2020-06-17T15:09:11+0200 > COM.APPLE.QUICKTIME.MAKE: Apple > COM.APPLE.QUICKTIME.MODEL: MacBookPro15,1 > ENCODER : Lavf58.20.100 > Duration: 00:00:38.57, start: -0.007000, bitrate: 659 kb/s > Stream #0:0: Video: vp9 (Profile 0), yuv420p(tv), 1980x1212, SAR 1:1 DAR 165:101, 60 fps, 60 tbr, 1k tbn, 1k tbc (default) > Metadata: > HANDLER_NAME : Core Media Video > ENCODER : Lavc58.35.100 libvpx-vp9 > DURATION : 00:00:38.557000000 > Stream #0:1: Audio: opus, 48000 Hz, 7.1, fltp (default) > Metadata: > HANDLER_NAME : Core Media Audio > ENCODER : Lavc58.35.100 libopus > DURATION : 00:00:38.573000000
<rdar://problem/94280874>
> Stream #0:1: Audio: opus, 48000 Hz, 7.1, fltp (default) macOS' system Opus decoder doesn't support more than 2 channels.
Same issue: https://bugs.webkit.org/show_bug.cgi?id=229325
*** This bug has been marked as a duplicate of bug 229325 ***