[Webkit-unassigned] [Bug 207622] New: MediaSource.isTypeSupported() says "video/mp4; codecs=\"avc3.42C015\"" is not supported, but it is

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207622

            Bug ID: 207622
           Summary: MediaSource.isTypeSupported() says
                    "video/mp4;codecs=\"avc3.42C015\"" is not supported,
                    but it is
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: robert.bryer at bbc.co.uk

The current Safari Technology Preview (Release 100 (Safari 13.2, WebKit 14610.1.2.1)) rejects the AVC3 codec string "video/mp4;codecs=\"avc3.42C015\"" with MediaSource.isTypeSupported(). In my current production version of Safari (13.0.3) it's accepted. It looks like this only affects AVC3 because changing it to AVC1 returns true, like "video/mp4;codecs=\"avc1.42C015\"".

And it does still play AVC3; if I ignore the codec error, it plays these videos fine without issue.

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