[Bug 12544] New: MEDIA CONTROLLER requires track kind for in-band tracks


           Summary: MEDIA CONTROLLER requires track kind for in-band
           Product: HTML WG
           Version: unspecified
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P3
         Component: HTML5 spec (editor: Ian Hickson)
        AssignedTo: ian@hixie.ch
        ReportedBy: jfoliot@stanford.edu
         QAContact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-wg-issue-tracking@w3.org,

At this point, it is also not possible to discover the functionality that a
in-band track provides through script. A similar problem was solved for the
TextTrack object by introduction of a kind attribute.
This is also necessary for the TrackList object, in particular to introduce a
standard naming scheme across different media container formats for exposing
the kind of data that their tracks provide.

Therefore, we request addition of a getKind(in unsigned long index) function to
the TrackList object, or something of equivalent functionality.

The proposed list of values that kind should understand are:
for video:
* sign language video (in different sign languages as provided through
* captions (as in: burnt-in video that may just be overlays)
* different camera angles
* video mosaic
for audio:
* audio descriptions
* language dub
* commentary (such as director's commentary)
* clear audio (see

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Received on Saturday, 23 April 2011 03:13:50 UTC