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

From: <bugzilla@jessica.w3.org>
Date: Mon, 29 Aug 2011 16:08:47 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1Qy4OF-0007F6-2J@jessica.w3.org>

--- Comment #5 from Bob Lund <b.lund@cablelabs.com> 2011-08-29 16:08:45 UTC ---
An FCC report and order regarding video descriptions has been issued 
This cites the requirement to support pass-through (paragraph 20) and makes
reference to the use of the secondary audio program for carrying video
descriptions (paragraph 28). These are requirements to support descriptions
that are embedded in the program's main dialogue (and received as a single
composite track by the receiver). I think this is strong motivation to add a
new category to AudioTrack.kind to identify audio programs with embedded
descriptions as proposed in this bug.

(In reply to comment #0)
> Problem statement:
> Audio description tracks can come in two forms. In one form, the audio
> description is a separate track from the video main dialogue. In another form,
> used by satellite and cable television, audio descriptions are premixed with
> the main dialogue track. U.S. Cable (and Canada) follow [1] where section 6.4
> “Visually Impaired (VI)” specifies “The VI associated service is a complete
> program mix containing music, effects, dialogue, and additionally a narrative
> description of the picture content”. The current HTML5 specification Editor’s
> Draft defines one kind of audio description track, “description”, which
> identifies an audio track of the first form, i.e. a separate audio description
> track. Content authored for satellite and cable television (audio descriptions
> pre-mixed with the main dialogue) that is delivered to an HTML5 browser also
> needs to be identified by AudioTrack.kind categories. 
> Specification sections affected:
> “HTML5 A vocabulary and associated APIs for HTML and XHTML” section
> “AudioTrackList and VideoTrackList objects.”
> One suggested solution:
> Define two new AudioTrack.kind categories in section “AudioTrackList and
> VideoTrackList objects”: “main+description” is the main dialogue track with
> embedded audio descriptions, “translation+description” is a translated version
> of the main track with embedded audio descriptions.
> [1]"ATSC A/53: Part-5 standard for audio coding & delivery"
> http://www.atsc.org/cms/standards/a53/a_53-Part-5-2010.pdf

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