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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: Tue, 30 Aug 2011 23:24:29 +0000
To: public-html-a11y@w3.org
Message-Id: <E1QyXfR-0007bF-Ns@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=13357

Mark Vickers <mark_vickers@cable.comcast.com> changed:

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--- Comment #8 from Mark Vickers <mark_vickers@cable.comcast.com> 2011-08-30 23:24:26 UTC ---
I checked with our experts on audio description tracks and got the following
answer:

"From an International (European) perspective it is correct that Video
Descriptions may be delivered separately for downstream mixing, or Descriptions
may be delivered pre-mixed.  However in the US and Canada the only technique in
use or contemplated at this time is pre-mixed and delivered as an alternate
"complete main" audio channel.  I think the W3C needs to account for the
differences between how this is done indifferent parts of the world"

I believe this is because US and Canadian client devices (TVs & set-top boxes)
currently only switch between the main audio track and the secondary audio
programming (SAP) track. In the US, this often switches between English and
Spanish dialog. The client devices never mix the two audio tracks. Therefore,
new audio description tracks will be pre-mixed so the client devices can
continue to switch between the tracks with no audio mixing at the client.

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Received on Tuesday, 30 August 2011 23:24:35 GMT

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