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[Bug 13357] <video>: Additional AudioTrack.kind categories are needed to identify tracks where audio descriptions are premixed with main dialogue.

From: <bugzilla@jessica.w3.org>
Date: Wed, 09 Nov 2011 23:06:04 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1ROHDY-0000sm-9h@jessica.w3.org>

--- Comment #10 from Mark Vickers <mark_vickers@cable.comcast.com> 2011-11-09 23:06:03 UTC ---
(In reply to comment #9)
> The resolution suggested by the Media Pipeline task force (MPTF) is the same
> one suggested in the original bug report.

To be clear, the referenced MPTF document actually describes two alternate
solutions, both of which were discussed at the F2F. Option A is the same as in
the original bug report. Option B is a more general alternative solution.

Option A: Define two new Category values:
   "main+description" - pre-mixed main audio track and audio descriptions
   "translation+description" - pre-mixed translated audio track and audio

Option B: Make Category a list, allowing other combinations (e.g. video with
main and sign)

Coincidentally, the W3C just posted a promotional video that includes a version
with descriptive audio in the currently unsupported pre-mixed format,
illustrating the need for this bug to be fixed:

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