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Re: timing model of the media resource in HTML5

From: Eric Carlson <eric.carlson@apple.com>
Date: Tue, 2 Feb 2010 07:24:33 -0800
Cc: Philip Jägenstedt <philipj@opera.com>, HTML Accessibility Task Force <public-html-a11y@w3.org>, Ken Harrenstien <klh@google.com>
Message-Id: <0862F8AD-8867-41EC-9DDF-539A3D00C1F2@apple.com>
To: Silvia Pfeiffer <silviapfeiffer1@gmail.com>

On Feb 2, 2010, at 7:18 AM, Eric Carlson wrote:

> 
> On Feb 1, 2010, at 10:31 PM, Silvia Pfeiffer wrote:
> 
>> 
>> You mentioned there are unique track identifiers in MPEG/QuickTime.
>> Are those strings or numbers?
>> 
>  It is a 32-bit integer that uniquely identifies the track, see section 8.4 of ISO/IEC 14496-12 for MPEG-4 or http://developer.apple.com/mac/library/documentation/QuickTime/QTFF/QTFFChap2/qtff2.html#//apple_ref/doc/uid/TP40000939-CH204-25550 for QuickTime.
> 
  Although the unique identifier is an integer in QuickTime and ISO files, this is an implementation detail that we shouldn't be constrained by. Other formats could use an identifier, like a UUID, that is more naturally expressed as a String.

eric
Received on Tuesday, 2 February 2010 15:25:06 GMT

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