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Re: Videos - do we need both captions and transcripts?

From: Janina Sajka <janina@rednote.net>
Date: Mon, 6 Feb 2017 09:33:24 -0500
To: Gregg C Vanderheiden <greggvan@umd.edu>
Cc: John Foliot <john@foliot.ca>, Nimisha Joshi <nimisha.joshi@northwestern.edu>, IG - WAI Interest Group List list <w3c-wai-ig@w3.org>
Message-ID: <20170206143324.GE2476@opera.rednote.net>
Hi, Gregg, All:

Gregg C Vanderheiden writes:
> > On Feb 3, 2017, at 6:07 PM, John Foliot <john@foliot.ca> wrote:
> > 
> > Both captions and video descriptions are synchronized to the "Master" timeline of the video: their utility is based on this synchronization. Transcripts (Gregg called them scripts, but I am unsure what his differentiation is, however the *actual* WCAG definition is for alternative for time-based media - https://www.w3.org/TR/WCAG20/#alt-time-based-mediadef <https://www.w3.org/TR/WCAG20/#alt-time-based-mediadef>) traditionally are not synced to the video resource, but (per the MAUR) should instead take advantage of semantic structure (good headings, inter-document navigation, etc.)
> A transcript is a text doc that contains a transcript of audio.  
> It is only an alternative to a audio recording (or a talking head where there is nothing to describe regarding the video). 
> a Script is a text doc that contains a transcript of the audio and a text description of the important visual information
> a script is an alternative to an AV recording (a video or  movie)
> Synchronized media
> any time based media that needs to be synchronized with something else such as video or audio or interaction
> Examples of media this is synchronized and not 
> an audio recording - is NOT Synchronized media
> an video only recording - is NOT Synchronized media
> an audio/video recording - IS Synchronized media
> an audio recording that has  “press now” in it where what happens depends on pressing at that point in time  - IS Synchronized media
> a video only recording where doing an action at different points in the video has different results (e.g. clicking when you see the car you want)  - IS Synchronized media
> The proper alternatives to the above  5 items
> audio only —  alt is transcript
> video only -   alt is either described video or a text description of the video (the latter is better for deaf-blind access and is faster )
> audio/video -  alt is captioned and described video — or a SCRIPT containing all dialog and sounds and all important visual information  (best for deaf blind)
> Audio with time-based interaction — alt is a transcript with links at the appropriate points in the transcript 
> video only with time based interaction — alt is a text description of the visual information with links at the appropriate points in the text description 
> it would probably be a good idea to grab this and save it someplace like the Understanding WCAG 2.0  - maybe under the general GUIDELINE. 

We expect to update the MAUR this year. Several edits to MAUR 1.0 have
been already proposed before this discussion, So these comments are
timely and most welcome.

I expect APA will form a Task Force to update the MAUR, and then to help
determine further W3C support for accessible media via both the ARIA and
Web Platforms WGs.



> best
> gregg


Janina Sajka,	Phone:	+1.443.300.2200
		Email:	janina@rednote.net

Linux Foundation Fellow
Executive Chair, Accessibility Workgroup:	http://a11y.org

The World Wide Web Consortium (W3C), Web Accessibility Initiative (WAI)
Chair, Accessible Platform Architectures	http://www.w3.org/wai/apa
Received on Monday, 6 February 2017 14:34:44 UTC

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