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[Bug 10642] No alternative text description for video key frame (poster)

From: <bugzilla@jessica.w3.org>
Date: Thu, 30 Sep 2010 16:19:04 +0000
To: public-html-a11y@w3.org
Message-Id: <E1P1Lqa-0007E4-56@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=10642

--- Comment #18 from Kornel Lesinski <kornel@geekhood.net> 2010-09-30 16:19:03 UTC ---
(In reply to comment #15)
> (In reply to comment #4)
> > Title: 2010 Marathon Coverage
> > Poster alt: Sally Smith crossing the finish line with her hands upraised.
> 
> I think this is a clear example of how poster alt would be useful. Note I am
> not sure what point comment 13 is making; there will always be examples of bad
> alt text out there.

My point is that poster frame may not be representative of the video. That's
not merely problem of bad alt, but bad poster frames to begin with.

Poster frame is not original content, it is just placeholder for unloaded
video. Because in practice poster frames are often automatically selected (e.g.
first or middle frame of the video) they are often poor representation of video
as a whole.

A poster frame for video of "Sally Smith crossing the finish line" might as
well happen to be "A reporter standing with microphone in front of a crowd". 

A use case of "user with no or poor vision wanting to know what video is about
and what mood it has" might not be served by poster description as well as by
description of the video as a whole.

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