[Webkit-unassigned] [Bug 216652] New: Safari reports WebM+VP9 support on macOS Big Sur Safari, but fails to play

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216652

            Bug ID: 216652
           Summary: Safari reports WebM+VP9 support on macOS Big Sur
                    Safari, but fails to play
           Product: WebKit
           Version: Other
          Hardware: Macintosh
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tomaspalmeirim at gmail.com

Browser: Safari Version 14.0 (16610.2.2.4) / Safari Technology Preview Release 113 (Version 14.0.1, WebKit 16610.2.3.1)
OS: macOS Big Sur Version 11.0 Beta (20A5364e)

MediaSource.isTypeSupported('video/webm') returns true

However, the browser cannot play webm videos, as can be seen at: https://upload.wikimedia.org/wikipedia/commons/transcoded/c/c0/Big_Buck_Bunny_4K.webm/Big_Buck_Bunny_4K.webm.360p.vp9.webm or https://dl5.webmfiles.org/big-buck-bunny_trailer.webm

This also breaks libraries such as Shaka Player (https://github.com/google/shaka-player/issues/2852)

Interestingly, canPlayType correctly reports that this format is not supported
document.createElement('video').canPlayType('video/webm') returns ""

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