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Re: Tech Discussions on the Multitrack Media (issue-152)

From: Eric Carlson <eric.carlson@apple.com>
Date: Thu, 3 Mar 2011 15:20:54 -0800
Cc: Bob Lund <B.Lund@CableLabs.com>, Silvia Pfeiffer <silviapfeiffer1@gmail.com>, Philip Jägenstedt <philipj@opera.com>, "public-html@w3.org" <public-html@w3.org>
Message-Id: <368EC634-D52E-468E-8477-860FF23F4708@apple.com>
To: Mark Watson <watsonm@netflix.com> 

On Mar 3, 2011, at 3:13 PM, Mark Watson wrote:

> In all cases we need both a label and an identifier. A label tells you some information about the track, but does not identify it: two tracks might have the same label. An identifier uniquely identifies the track but doesn't necessarily tell you anything about it.
> 
> As Eric says ISO/QT files have IDs and type: I'm not sure if the types in ISO files go further than audio/video/text etc. though.
> 
  Type identifies the format of the media samples in the track, eg. MPEG-4 video, AAC audio, MP3, etc.

eric
Received on Thursday, 3 March 2011 23:21:53 GMT

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