[Webkit-unassigned] [Bug 44517] New: HTMLMediaElement.canPlayType gives false positives in Safari

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=44517

           Summary: HTMLMediaElement.canPlayType gives false positives in
                    Safari
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
               URL: http://beta.html5test.com/testcases/video/
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Media Elements
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: niels.leenheer at gmail.com


When a codecs parameter is provided and the MIME type is supported, canPlayType() always returns "probably" regardless of the contents of the codecs parameter. This results in false positives and makes it impossible to reliably detect codec support in Safari.

For example:

v=document.createElement('video');
v.canPlayType('video/mp4')
-> maybe     // correct

v=document.createElement('video');
v.canPlayType('video/mp4; codecs="avc1.42E01E"')
-> probably     // correct

v=document.createElement('video');
v.canPlayType('video/mp4; codecs="theora"')
-> probably     // incorrect

v=document.createElement('video');
v.canPlayType('video/mp4; codecs="iv50"')
-> probably     // incorrect

The canPlayType() function should only return "probably" when the codecs parameter represents an actually supported codec. Unknown codec parameters should return an empty string.

See also: http://rakaz.nl/2010/06/problems-with-html5-video-codec-detection.html

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