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

From: <bugzilla@jessica.w3.org>
Date: Tue, 12 Oct 2010 20:11:16 +0000
To: public-html-a11y@w3.org
Message-Id: <E1P5lBs-0002iW-LL@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=10642

--- Comment #49 from Silvia Pfeiffer <silviapfeiffer1@gmail.com> 2010-10-12 20:11:15 UTC ---
(In reply to comment #44)
> I think Maciej is right, but I wonder how common it will be for the description
> of the multimedia (audio/video) to be significantly different from the
> description of the poster.  I guess it's possible that the poster conveys
> *additional* information over and above what the movie contains, but I would
> have thought this was an unlikely case, and perhaps even one that we don't need
> to encourage.

For people with sight, the poster always provides extra information about the
video, because it provides insight into a particular shot of the video. If an
author goes to the effort of providing a separate image as a poster, they
should be able to provide a short description of that image for accessibility
needs, too.

I would, however, think that introduction of a new element inside the video
element is overkill. I was simply thinking of the following as being
sufficient:

<video src="video.ogv" poster="image.png" posteralt="Ian Hickson - editor of
HTML5 spec" title="a video about HTML5" controls>
</video>


> I guess I am more keen on descriptive and transcriptive text for the movie, and
> once we have that cleanly done, then ask the question "do we need it *as well*
> for the poster?"

The descriptive and transcriptive texts are very important, but they are for
after you have made the decision to consume the video. The alt texts are input
into making the decision to view the video, just like the poster is for people
with sight.

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