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[Bug 12544] MEDIA CONTROLLER requires track kind for in-band tracks

From: <bugzilla@jessica.w3.org>
Date: Fri, 13 May 2011 01:15:15 +0000
To: public-html-a11y@w3.org
Message-Id: <E1QKgyJ-0003NJ-PM@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=12544

Mark Watson <watsonm@netflix.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |

--- Comment #7 from Mark Watson <watsonm@netflix.com> 2011-05-13 01:15:07 UTC ---
Three additional track kinds are required for accessibility purposes as
follows:

captions - video with open ("burned in") captions
subtitles - video with open ("burned in") subtitles
clearaudio - an alternative audio track in which sounds which are not dialog or
other important non-speech information are attenuated

Video with open captions/subtitles is still in practical use when closed
captions/subtitles in separate files are not available. This is often the case
with old content.

Clear audio streams are intended to make dialog easier to understand for those
with poor hearing. They are available for some content and specifically are
available in the UK from the BBC.

There is work happening at MPEG and 3GPP to expose track kinds in their
adaptive streaming standards. MPEG and 3GPP would like to utilise the same
terms and meaning as we are using here to make the mapping of track types in
their adaptive streaming formats to our API obvious.

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