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