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

From: Gregg C Vanderheiden <greggvan@umd.edu>
Date: Fri, 3 Feb 2017 18:43:20 +0100
Message-Id: <DA5813EC-FE6F-4F24-B56A-001BF05EC3A9@umd.edu>
Cc: Nimisha Joshi <nimisha.joshi@northwestern.edu>, Janina Sajka <janina@rednote.net>, IG - WAI Interest Group List list <w3c-wai-ig@w3.org>
To: John Foliot <john@foliot.ca>

> 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. 


best

gregg
Received on Friday, 3 February 2017 17:43:55 UTC

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