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

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Date: Sat, 20 Aug 2011 03:36:21 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1QucM9-0000nC-5z@jessica.w3.org>

--- Comment #3 from Silvia Pfeiffer <silviapfeiffer1@gmail.com> 2011-08-20 03:36:20 UTC ---
(In reply to comment #2)
> How is this kind distinguished in existing video formats?
> That is, what types would this map to in H.264, WebM, or Ogg files?

In Ogg such a track would just be under the role "main" because such mixed
content is not the best way to publish content - it's better to keep such
content separate. Once mixed, it's basically impossible to get back to the
individual parts and e.g. remove the audio description again. As such it is the
new "main". It has also not been a common case to deal with yet.

This doesn't quite match with the user experience though and where such content
is delivered, it has to be made clear to the user that the main content has
such other information in it. In the past I have seen it even mentioned in the
title displayed above the video and explicitly described in the description to
point out to the user what they have to expect from the content.

In a situation where a program has to pick an adequate piece of content, e.g.
content that actually has an audio description, just using kind=main is indeed
insufficient. I'm prepared to suggest to Ogg to add the use of "+" to the roles
attribute to enable use cases such as role="audio/main+audio/audiodesc" or

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Received on Saturday, 20 August 2011 03:36:26 UTC

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