[whatwg] Ressurecting <video> a11y thread [was Re: Video, Closed Captions, and Audio Description Tracks]
singer at apple.com
Fri Aug 22 04:09:25 PDT 2008
At 12:59 +0200 22/08/08, Aaron Leventhal wrote:
>Has anyone put any further thought on what to do about captions for Ogg?
>We've started to throw some thoughts together here:
>We could use some help from individuals who understand the area of
>video and captions. The problem of deciding what to do for captions
>in <video> or specifically for Ogg does not appear to be simple. I'd
>appreciate it if someone could prove us wrong.
I don't have ogg-specific opinions, but here are some ideas.
a) burn in the captions, and allow the HTML level to select between
sources with and without burned-in captions. This is not ideal, but
burned-in captions alas, do occur.
b) have a file format with streams that can be enabled/disabled.
Streams might be something like 3G timed text, or a more direct
translation of e.g. 508, or a more direct stream of e.g. w3C DFXP
(Timed text authoring format).
c) use a more heavy-weight generic layer such as SVG, MPEG LASeR, or 3G DIMS
d) use a SMIL file pointing at the timed text in some text format, in
a 'par' with the video
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