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

From: Timed Text Working Group Issue Tracker <sysbot+tracker@w3.org>
Date: Wed, 21 May 2014 08:32:33 +0000
Message-Id: <E1Wn1wv-0007v1-R3@stuart.w3.org>
To: public-tt@w3.org
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 ยง6 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.
Received on Wednesday, 21 May 2014 08:32:34 UTC

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