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Re: sect 5.2 review

From: Jon Gunderson <jongund@staff.uiuc.edu>
Date: Wed, 14 Apr 1999 21:16:06 -0500
Message-Id: <199904141414.JAA16488@staff1.cso.uiuc.edu>
To: allan_jm@tsb1.tsbvi.edu, WAI UA group <w3c-wai-ua@w3.org>
Cc: Geoff Freed <Geoff_Freed@wgbh.org>
Thanks,
Jon


At 04:51 PM 4/13/99 -0500, James Allan wrote:
>Geoff Freed (WGBH) and I review the section dealing with multimedia as part
>of a different task. below are some comments/thoughts/explanations.
>
>from http://www.w3.org/TR/1999/WAI-USERAGENT-19990331/
>
>Guideline 5.2 Ensure user control over alternative representations of
>content
>User agents must give users access to author-supplied alternative
>representations of content (descriptions of images, captions for video or
>audio, etc.) since some users cannot perceive the primary content due to a
>disability or a technological limitation (e.g., browser configured not to
>display images). See also guideline 5.3.
>
>General checkpoints:
>
>5.2.1 [Priority 1]
>Ensure that the user has access to alternative representations of content
>(e.g., the value of "alt" in HTML or SMIL
><note>there is no "alt" in SMIL,  perhaps "captions or audio description in
>SMIL"</note>,
>the resource designated by "longdesc", or the content of OBJECT in HTML 4.0,
>the "summary" attribute for tables in HTML, etc.).
>
><new>Checkpoints for images: </new>
><note>these two checkpoints seem to deal specifically with images, so we
>grouped them together, as well as changed/inserted the groupings of other
>media types.</note>
>
>5.2.2 [Priority 2]
>When no alternative text representation has been specified, indicate what
>type of object is present.
><note>possible technique-indicate what alternatives are available from the
>source in SMIL player</note>
>
>5.2.3 [Priority 3]
>When alternative text has been specified explicitly as empty (i.e., an empty
>string), render nothing.
>
><new> Checkpoints for Multimedia:
>Multimedia includes audio and video information with specific alternative
>representation of information. Alternative representations of audio includes
>other audio language tracks and captions (also in other languages).
>Alternative representations of video include other audio language tracks,
>captions and audio description.
>
>Checkpoints for captions: </new>
><note>We thought it made sense to have specific checkpoints for captions.
>They are text representations of audio information. Alternative audio
>representations (other audio languages) are found in the Checkpoints for
>audio section. A person from the A/V field would categorize the information
>in this manner. </note>
>
><note>Moved from checkpoints for audio</note>
>5.2.5 [Priority 2]
>Allow the user to specify that captions for audio be rendered at the same
>time as the audio.
><note> separated captions from audio description and made 2 separate
>checkpoints. Audio description is alternative content for video and should
>be included in that section (see 5.2.9).</note>
>
><note>Moved from checkpoints for video</note>
>5.2.6 [Priority 1]
>If a technology allows for more than one caption track (e.g., text,
>alternative language (subtitle), etc.), allow the user to choose from among
>tracks.
><note>  separated captions from audio description and made 2 separate
>checkpoints. Audio description is alternative content for video and should
>be included in that section (see 5.2.9a).</note>
>
>Checkpoints for audio:
>
><note>Moved from checkpoints for video</note>
>5.2.7 [Priority 1]
>If a technology allows for more than one audio track (alternative language
>or overdub) for video, allow the user to choose from among tracks.
>
>Checkpoints for video:
>
>5.2.9 [Priority 1]
>Allow the user to specify that audio descriptions for video be rendered at
>the same time as the video.
><note>separated the captions, see 5.2.5</note>
>
><new>
>5.2.9a [Priority 1]
>If a technology allows for more than one audio description track for video,
>allow the user to choose from among tracks.</new>
><note>mirroring caption checkpoints</note>
>
><new>5.2.x [Priority 2]
>Allow the user to specify that sign language video track (if available) be
>rendered at the same time as the video. </new>
><note>this was not specified before. it is possible with in the SMIL spec to
>provide this capability</note>
>
>
>Jim Allan, Statewide Technical Support Specialist
>Texas School for the Blind and Visually Impaired
>1100 W. 45th St., Austin, Texas 78756
>voice 512.206.9315    fax: 512.206.9453  http://www.tsbvi.edu/
>"We shape our tools and thereafter our tools shape us." McLuhan, 1964
> 
Jon Gunderson, Ph.D., ATP
Coordinator of Assistive Communication and Information Technology
Division of Rehabilitation - Education Services
University of Illinois at Urbana/Champaign
1207 S. Oak Street
Champaign, IL 61820

Voice: 217-244-5870
Fax: 217-333-0248
E-mail: jongund@uiuc.edu
WWW:	http://www.staff.uiuc.edu/~jongund
	http://www.als.uiuc.edu/InfoTechAccess
Received on Wednesday, 14 April 1999 10:15:36 GMT

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