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Re: [media] Moving forward with captions / subtitles

From: Philip Jägenstedt <philipj@opera.com>
Date: Mon, 15 Feb 2010 16:46:00 +0800
To: "Eric Carlson" <eric.carlson@apple.com>
Cc: "Silvia Pfeiffer" <silviapfeiffer1@gmail.com>, "HTML Accessibility Task Force" <public-html-a11y@w3.org>
Message-ID: <op.u75umyx0atwj1d@philip-pc>
On Mon, 15 Feb 2010 15:19:09 +0800, Eric Carlson <eric.carlson@apple.com>  
wrote:

>
> On Feb 14, 2010, at 11:06 PM, Philip Jägenstedt wrote:
>
>>> This is exactly replicating what the wiki page already says, except
>>> with <trackgroup> instead of <track> and with <track> instead of
>>> <source>. Also, it adds the discussed stand-alone possibility of
>>> <track> with a @src attribute, which we had already discussed.
>>>
>>> Could we just stick with the naming as we have it at
>>> http://www.w3.org/WAI/PF/HTML/wiki/Media_TextAssociations ?
>>
>> I think calling the grouping element <track> is a bad idea when it in  
>> fact doesn't specify a track but a group of tracks (each track in  
>> <source>).
>>
>   But it does not represent a group of tracks!
>
>   The <track> element represents a single track in the presentation,  
> which uses one of the <source> elements as its source of media data.

How would this tie into the MediaTrack API and the MediaTracks collection?  
It is my understanding that each individual stream in a Ogg or MPEG-4  
would be a MediaTrack. Would a <track> or a <source> represent a  
MediaTrack? If it is <track>, how would one activate a single <source> via  
the MediaTracks collection? Or is the intention that source selection in  
<track> completely determine which <source> is used so that the only way  
of switching between e.g. languages is rearranging the order of <source>s  
and calling .load() (or similar)?

-- 
Philip Jägenstedt
Core Developer
Opera Software
Received on Monday, 15 February 2010 08:46:50 GMT

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