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Re: Topics for "Video" Breakout Group

From: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
Date: Fri, 6 Nov 2009 16:19:13 -0800
Message-ID: <2c0e02830911061619s46264280x1cb35987a463a38e@mail.gmail.com>
To: Laura Carlson <laura.lee.carlson@gmail.com>
Cc: public-html <public-html@w3.org>, HTML Accessibility Task Force <public-html-a11y@w3.org>
The minutes of today's breakout group meeting are at
http://www.w3.org/2009/11/06-video-minutes.html (please
s/sylvia/silvia/).

We didn't get through the whole agenda (only points 1-3 of
http://esw.w3.org/topic/HTML/MultimediaAccessibilty/TPACSession), but
I believe we visited the core issues and made a start at discussions
and requirements for specifications.

I'd like to thank everyone there for the constructive discussions and
it's excellent to see the work on media accessibility started.

Cheers,
Silvia.

On Fri, Nov 6, 2009 at 7:32 AM, Laura Carlson
<laura.lee.carlson@gmail.com> wrote:
> Hi Silvia,
>
>> If somebody wants to put this in a wiki, I'd be happy for it, but
>> since I'm not an editor, this is probably the best way to start the
>> list.
>
> I put the agenda in the Wiki. It is at:
> http://esw.w3.org/topic/HTML/MultimediaAccessibilty/TPACSession
>
> I also added you to the Wiki Editor's Group.
> http://esw.w3.org/topic/ESWEditorsGroup
>
> Best Regards,
> Laura
>
> On Thu, Nov 5, 2009 at 7:01 PM, Silvia Pfeiffer
> <silviapfeiffer1@gmail.com> wrote:
>> Hi all,
>>
>> This is a list of issues that I have gathered about video from
>> Sunday's workshop and would like to see discussed in the HTML WG
>> "Video" breakout group on Friday, 10am at TPAC.
>>
>> If somebody wants to put this in a wiki, I'd be happy for it, but
>> since I'm not an editor, this is probably the best way to start the
>> list. Please reply to the email with anything I have missed in your
>> eyes.
>>
>> 1. baseline codecs (http://www.w3.org/html/wg/tracker/issues/7,
>> http://www.w3.org/html/wg/tracker/actions/130)
>> * the consumer need for a common baseline codec is being voiced widely
>> * what are the options towards getting to an agreement on a common
>> baseline codec
>>
>> 2. Cue Ranges
>> * there seems to be a need for cue ranges, e.g. activate slide
>> changes, pause and display ad, captions for live video, others??
>> * why is timeupdate not sufficient?
>> * why was previous specification not acceptable?
>> http://web.archive.org/web/20080724033624/http://www.whatwg.org/specs/web-apps/current-work/#cue-ranges
>> * revisit Apple proposal:
>> http://lists.w3.org/Archives/Public/public-html/2008May/0512.html
>>
>> 3. Media element accessibility (http://www.w3.org/html/wg/tracker/issues/9)
>> * brief summary of Sunday workshop: http://www.w3.org/2009/11/01-media-minutes
>> * feedback from PFWG: http://www.w3.org/2009/08/html5-spec-review
>> * current status:
>> http://lists.w3.org/Archives/Public/public-html/2007Jul/0136.html
>>
>> 3.1. Requirements
>> * existing documents:
>> http://esw.w3.org/topic/HTML/MultimediaAccessibilty
>> http://wiki.whatwg.org/wiki/Video_accessibility
>> https://wiki.mozilla.org/Accessibility/Video_a11y_Study08
>> * existing bugs:
>> http://www.w3.org/Bugs/Public/show_bug.cgi?id=5758 (general accessibility)
>> http://www.w3.org/Bugs/Public/show_bug.cgi?id=8187 (audio descriptions)
>> * Sunday workshop stated need to write another requirements document -
>> possibly a summary of the above
>>
>> 3.2. Caption/Subtitle support
>> * there seems to be a need for declarative syntax for external caption
>> files - all inside the DOM or through javascript integrated?
>> * there seems to be a need to find out what content tracks are
>> available in a binary media file - a javascript query or a descriptive
>> block or a link to a file, SMIL-style?
>> * there seems to be a need to provide user interface controls for
>> captions (both, internal and external) and/or a standard API that
>> would allow a UA to query if media ".hasCaptions"
>> * there seems to be a need to provide a javascript API to get access
>> to the individual captions (both, internal and external)
>> * how would a user relate a caption file to a video inside the browser
>> on the fly?
>>
>> 3.3. What format to support for captions/subtitles?
>> * there seems to be a need for a baseline caption/subtitle codec
>> * srt vs DFXP vs. smilText? others?
>> http://www.srt-subtitles.com/
>> http://www.w3.org/TR/ttaf1-dfxp/
>> http://www.w3.org/TR/SMIL3/smil-text.html
>>
>> 3.4. Security issues with external caption files
>> * there seems to be a need to deal with XSS issues for external
>> caption/subtitle files
>> * is CORS the answer? http://www.w3.org/TR/access-control/
>>
>> 3.5. Display activation issues with captions/subtitles
>> * there seems to be a need to specify display mechanisms for captions
>> * automated activation based on a browser preference? e.g. subtitles = on/off
>> * automated language selection based on browser setting? e.g. en for
>> ppl with browser set to en
>> * captions on by default / by selection
>>
>> 3.6. Audio description support
>> * there is a need to provide support for audio descriptions
>> * textual vs. audio versions?
>> * content negotiation for multi-track video?
>> * control of playback rate changes?
>>
>> 4. Hierarchical navigation through audio/video elements
>> * there seems to be a need to mark up media elements with a
>> hierarchical structure that can be used for browsing through the
>> element
>> * how should that be included?
>>
>> 5. Multi-track video
>> * there are many more alternative information tracks for videos, such as
>> - sign language,
>> - music/background sound track,
>> - alternate video angles,
>> - dubbed audio tracks,
>> - ticker text
>> - active regions (timed)
>> - annotations
>> - timed metadata
>> - timed transcript
>> - karaoke
>> - lyrics
>> - linguistic markup
>> * how to deal with such a collection of additional materials?
>>
>> Looking forward to an interesting and productive discussion tomorrow!
>>
>> Best Regards,
>> Silvia.
>
> --
> Laura L. Carlson
>
Received on Saturday, 7 November 2009 00:20:14 GMT

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