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I noticed that the algorithm to extract in-band text tracks from Ogg isn't extracting the right information as in-band metadata track dispatch type. It needs updating to contain: 1. the format (that's the Content-type field in Skeleton) 2. the semantics (that's the Role filed in Skeleton) The label field should be copied into the TextTrack.label attribute. A similar inclusion of both format and semantics information is probably necessary for other file formats, too.
*** This bug has been marked as a duplicate of bug 24997 ***