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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.

Received on Tuesday, 2 February 2010 15:25:06 UTC

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