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Re: Topics for "Video" Breakout Group

From: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
Date: Fri, 6 Nov 2009 09:18:54 -0800
Message-ID: <2c0e02830911060918h3c0471bepde9dc9726fff42ae@mail.gmail.com>
To: Laura Carlson <laura.lee.carlson@gmail.com>
Cc: HTML Accessibility Task Force <public-html-a11y@w3.org>
Thanks very much - much appreciated.
This will also help me deliver the overview page on the itext work
into the wiki, which I promised at the workshop on Sunday.

Best Regards,
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 Friday, 6 November 2009 17:19:48 GMT

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