[Webkit-unassigned] [Bug 75154] New: Media tags should choose the best <source>, not the first MaybeSupported one.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=75154

           Summary: Media tags should choose the best <source>, not the
                    first MaybeSupported one.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fischman at chromium.org


Migrated from http://code.google.com/p/chromium/issues/detail?id=35136

Consider:
<video controls autoplay>
  <source src="dirac.ogv" type='video/ogg; codecs="dirac, vorbis"' />
  <source src="theora.ogv" type='video/ogg; codecs="theora, vorbis"' />
</video>

Today chromium (for example) will attempt to use the first <source> child (and fail because it doesn't include a dirac decoder).
I think the problem is in HTMLMediaElement::selectNextSourceChild where the iteration among the <source> children of <video> stops as soon as it hits a !IsNotSupported child, instead of looking for a "best" match.
Ideally if an IsSupported child follows a MayBeSupported child, the IsSupported one should be used.

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