RE: ISSUE-309 (Image profile fails WCAG 1.2): Image profile needs to permit text equivalent [TTML IMSC 1.0]

“Overlooked” and a “pity” in W3C perhaps, but not in CFF where it was studied and rejected as it created more problems than it solved.  Alternative full tracks/documents are a much cleaner solution in full media files (e.g. MP4).

 

Maybe W3C has different requirements for stand-alone TTML documents?

 

No objection to enabling it, but we could do with less judgment about other industry work.

 

                Mike

 

From: John Birch [mailto:John.Birch@screensystems.tv] 
Sent: Wednesday, May 21, 2014 2:02 AM
To: Timed Text Working Group
Cc: Glenn Adams
Subject: RE: ISSUE-309 (Image profile fails WCAG 1.2): Image profile needs to permit text equivalent [TTML IMSC 1.0]

 

This is actually a very old ‘requirement’… (it’s a great pity it is consistently over-looked L

 

http://www.w3.org/2005/03/21/DFXPLastCallResponses.html - specifically Al Gilman’s comments

http://lists.w3.org/Archives/Public/public-tt/2003May/0011.html

http://lists.w3.org/Archives/Public/public-tt/2003May/0015.html

 

best regards,

John

 

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From: Glenn Adams [mailto:glenn@skynav.com] 
Sent: 21 May 2014 09:41
To: Timed Text Working Group
Subject: Re: ISSUE-309 (Image profile fails WCAG 1.2): Image profile needs to permit text equivalent [TTML IMSC 1.0]

 

I had previously reported this same comment on the CFF-TT image profile.

 

On Wed, May 21, 2014 at 5:32 PM, Timed Text Working Group Issue Tracker <sysbot+tracker@w3.org> wrote:

ISSUE-309 (Image profile fails WCAG 1.2): Image profile needs to permit text equivalent [TTML IMSC 1.0]

http://www.w3.org/AudioVideo/TT/tracker/issues/309

Raised by: Nigel Megitt
On product: TTML IMSC 1.0

IMSC1 Image profile [1] defined in §6 does not permit a text equivalent. If this profile is used to provide captions as an alternative to audio then it will fail the WCAG2 guideline 1.2 [2]. From a practical perspective this would mean that users who can neither see nor hear well can not use tools to translate the content into e.g. Braille.

[1] http://www.w3.org/TR/ttml-imsc1/#image-profile-constraints
[2] http://www.w3.org/TR/2008/REC-WCAG20-20081211/#media-equiv

Some potential ways to solve this:
1. Permit text to be included within the image profile that describes the images.
2. Require or recommend that when image profile captions are provided there should be a text profile caption track available simultaneously.





 

 

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