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Re: Topics for "Video" Breakout Group

From: Laura Carlson <laura.lee.carlson@gmail.com>
Date: Fri, 6 Nov 2009 09:32:50 -0600
Message-ID: <1c8dbcaa0911060732g731a2d5an770878c6ddfdf688@mail.gmail.com>
To: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
Cc: public-html <public-html@w3.org>, HTML Accessibility Task Force <public-html-a11y@w3.org>
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 15:33:19 GMT

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