Also seems broken on MacOS 10.15.5 Safari Version 13.1.1 (15609.2.9.1.2) and iOS 13.5.1 Safari. First segment plays, remaining ones do not.
thinkski
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I have filed a bug for this issue here:
https://bugs.webkit.org/show_bug.cgi?id=222781
Curious if you ever solved this. I'm running into the same -- perhaps Safari does not yet support HEVC with WebCodecs?