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

From: <bugzilla@jessica.w3.org>
Date: Mon, 25 Jul 2011 21:14:24 +0000
To: public-html@w3.org
Message-ID: <bug-13357-2495@http.www.w3.org/Bugs/Public/>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=13357

           Summary: Additional AudioTrack.kind categories are needed to
                    identify tracks where audio descriptions are premixed
                    with main dialogue.
           Product: HTML WG
           Version: unspecified
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HTML5 spec (editor: Ian Hickson)
        AssignedTo: ian@hixie.ch
        ReportedBy: b.lund@cablelabs.com
         QAContact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-wg-issue-tracking@w3.org,
                    public-html@w3.org


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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Received on Monday, 25 July 2011 21:14:30 GMT

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