[Webkit-unassigned] [Bug 135159] New: cuechange events stop being dispatched after subtitle display is toggled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=135159

           Summary: cuechange events stop being dispatched after subtitle
                    display is toggled
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: http://acdha.github.io/html5-media-synchronized-subtit
                    les/demo.html
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: chris at improbable.org


http://acdha.github.io/html5-media-synchronized-subtitles/demo.html is a simple experiment using the cuechange event to display a text transcript synchronized with video playback.

When the video first plays, the transcript below should scroll and be highlighted as the movie progresses. If you use the standard controls to enable subtitles, both the transcript and subtitles will display normally. If you then use the same control to disable subtitle display, the subtitles stop and the browser will stop sending cuechange events. Re-enabling subtitles (e.g. in Safari on OS X using "Subtitles" but not "Auto") will cause the cuechange events to start firing again.

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