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Re: Survey ready on Media Multitrack API proposal

From: Eric Carlson <eric.carlson@apple.com>
Date: Wed, 3 Mar 2010 08:33:01 -0800
Cc: Maciej Stachowiak <mjs@apple.com>, "Michael(tm) Smith" <mike@w3.org>, HTML Accessibility Task Force <public-html-a11y@w3.org>
Message-Id: <52BF6C54-C47E-4B1F-A053-983B8F544430@apple.com>
To: Silvia Pfeiffer <silviapfeiffer1@gmail.com>

On Mar 2, 2010, at 11:14 PM, Silvia Pfeiffer wrote:

>> 
>> You also didn't answer my second question -  are track names typically
>> unique? Do media container formats generally guarantee the presence of
>> unique track names?
> 
> There is no guarantee of their existence - same for the role
> attribute. But where they exist, they are unique.
> 
  Track IDs (which are numeric) in QuickTime and MPEG-4 files are guaranteed to be unique, track names are not required and are *not* guaranteed to be unique.

eric
Received on Wednesday, 3 March 2010 16:33:34 GMT

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