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[media] Minutes of today's media subgroup meeting

From: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
Date: Thu, 26 May 2011 09:43:12 +1000
Message-ID: <BANLkTi=ue-TnFBCM3yuxJbb-VHVYpca1qQ@mail.gmail.com>
To: HTML Accessibility Task Force <public-html-a11y@w3.org>
Hi all,

Please find the minutes of today's media subgroup meeting at
http://www.w3.org/2011/05/25-html-a11y-minutes.html and paste below.
Note that the agenda control didn't seem to go through to the
minutes... you can find them in the irc log at
http://www.w3.org/2011/05/25-html-a11y-irc .
I've made headings in the below copy.

Cheers,
Silvia.



- DRAFT -

HTML Accessibility Task Force Teleconference

25 May 2011

Attendees

Present
Janina, Sean, silvia, Judy, Eric, Plh
Regrets
John_Foliot, Marc_Watson
Chair
Janina_Sajka
Scribe
silvia


Contents
agenda+ Identify Scribe
agenda+ Clean Audio: What shall WE call it?
agenda+ Paused Media: Continuing Discussion
agenda+ Actions Review http://www.w3.org/WAI/PF/HTML/track/actions/open
agenda+ Other Business?
agenda+ be done

1. Indentify Scribe

scribe: silvia

2. Clean Audio: What shall WE call it?

discussion about what the tracks are
one type is a multi-channel mix in one track, where one channel has speech-only
such a track is an alternative to main audio
another type is an additional track that contains only speech and can
be increased in volume over other tracks
proposal is that we may need both
however there is not enough real-world use case knowledge in the group
to validate the use case

we will seek further input from experts before making a decision

3. Paused Media: Continuing Discussion

janina: last week we seemed to have a solution for how to
appropriately mark up alternative text, both short and long for video
including poster
both for graphical and non-graphical browsers
I took it to PF today
for example to find out if we retain language markup
and the answer is: yes - the markup is retained for elements, but not
for attributes
however, if you go into a non-graphical browsing mode, I'm not sure we are safe
eric: a non-graphical browser would not support the video element and
thus should take the fallback inside it
silvia: a lynx developer seemed to indicate that once a non-graphical
browser supports html5, it would not display the content inside the
video element
instead it would compose such text from the video element's attributes
I am not even sure we should be discussing this here in the a11y TF,
but it's an issue for the larger group
eric: it would then also have to support the aria attributes so it
should have enough information from aria-describedby as we have
suggested it

janina: what are the next steps? need to discuss in the wider community?
I wanted to introduce it into WAI today

sean, eric: seems a fine solution
silvia: the issue that John indicated was that when aria-describedby
points to structured markup, screenreaders currently just read it out
as text
when it should in fact be read out as structured markup, e.g. including URLs
Janina: yes, PF also agrees with this and screenreaders need to start
interpreting such text correctly
next step should be to get this information out more widely so we get
good information on that
janina: should this go into the HTML5 spec and / or into the HTML a11y
User Agent implementation guide

silvia: there is no spec change necessary for HTML5, but it might be
good to add an example into it to get the approach in front of more
eyes

eric: what we need to explain to people is how aria-describeby works
<janina> http://www.w3.org/TR/html-alt-techniques/
it should probably go into the HTML alt techniques document
janina: we also want it in the user agent guide, too
in particular that that level of markup should be supported
e.g. that uris need to be interpreted
eric, silvia: sounds fine by me
janina: will forward it in both cases
silvia: the only thing that we may need a change proposal for, if we
still want it, is the @transcript attribute
it could be replaced by a @longdesc attribute as a means to link to a
full transcript
sean: I think they are semantically different
silvia: instead we can just have it inside the aria-describedby markup
just like we have it for the poster long description
<video src="file.mp4" poster="poster.png" aria-describedby="posteralt
videosummary" aria-label="MyPlayer video player">
<p id="videosummary">A Clockwork Orange Trailer (<a
href="transcript.html">Transcript</a>)</p>
<p id="posteralt">Poster frame is a clockwork orange movie poster (<a
href="posterlongdesc.html">long description</a>)</p>
<p> <a href="file.mp4">Download the video file</a></p>
</video>
there is a lot of indirection now
sean: is the fallback content even in the dom?
eric, silvia: yes it is
sean: with this markup, there is no semantic markup that a machine can
rely on to interprete as the transcript
the user has no way to get at that content
silvia: yes, an attribute @transcript would allow creating a context
menu item for users
so do we want to start a discussion in the larger HTML5 group about
introducing such an attribute?
I can start such an email discussion on public-html
janina: yes
 general agreement

<scribe> ACTION: janina to work with authors of HTML alt techniques
document and HTML a11y user agent implementation guide to add the
aria-describedby video example there [recorded in
http://www.w3.org/2011/05/25-html-a11y-minutes.html#action01]
<trackbot> Created ACTION-127 - Work with authors of HTML alt
techniques document and HTML a11y user agent implementation guide to
add the aria-describedby video example there [on Janina Sajka - due
2011-06-01].

<scribe> ACTION: silvia to follow-up on @transcript attribute
[recorded in http://www.w3.org/2011/05/25-html-a11y-minutes.html#action02]
<trackbot> Created ACTION-128 - Follow-up on @transcript attribute [on
Silvia Pfeiffer - due 2011-06-01].

4. Actions Review http://www.w3.org/WAI/PF/HTML/track/actions/open

Judy will follow up on a reply to the ISO/MPEG group
re kind attribute values
other actions are still open and continue
there is also a bug on providing track usage examples - silvia will follow up

5. Other Business?

note that Google proposed a WebVTT WG charter to W3C
janina: we still have to take up the topic of navigation
silvia: had a brief discussion with Ian about this and we may be able
to satisfy it with existing techniques - have to look at it in more
depth - there's a bug in the HTML bug tracker
janina: keen to look at the Web Audio API
there is an ETSI standard on this for broadcasting


Summary of Action Items

[NEW] ACTION: janina to work with authors of HTML alt techniques
document and HTML a11y user agent implementation guide to add the
aria-describedby video example there [recorded in
http://www.w3.org/2011/05/25-html-a11y-minutes.html#action01]
[NEW] ACTION: silvia to follow-up on @transcript attribute [recorded
in http://www.w3.org/2011/05/25-html-a11y-minutes.html#action02]

[End of minutes]
Received on Wednesday, 25 May 2011 23:44:00 GMT

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