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Re: Clarification Of Technique 1.3

From: Charles McCathieNevile <charles@w3.org>
Date: Tue, 1 Aug 2000 01:05:48 -0400 (EDT)
To: Chris Ridpath <chris.ridpath@utoronto.ca>
cc: WAI WCAG List <w3c-wai-gl@w3.org>, Al Gilman <asgilman@iamdigex.net>
Message-ID: <Pine.LNX.4.20.0008010104290.29763-100000@tux.w3.org>
I guess the real question is whether the until user agents condition in WCAG
checkpoint 1.3 has been met...


On Fri, 28 Jul 2000, Chris Ridpath wrote:

  OK. The requirement for an audio description is not dependant on the
  presence of a text description.
  > An audio description is required when what you miss by not seeing the
  > is [something in the range of (significant, important, critical)].
  An audio description is much more difficult to create than a text
  description and the file size is much larger. So we need to be clear about
  when it's required before telling the author to do all this work.
  Do all important/significant/critical videos require an audio description?
  Is an audio description necessary if there is a good text description?
  ----- Original Message -----
  From: "Al Gilman" <asgilman@iamdigex.net>
  To: "Chris Ridpath" <chris.ridpath@utoronto.ca>; "WAI WCAG List"
  Sent: Friday, July 28, 2000 2:07 PM
  Subject: Re: Clarification Of Technique 1.3
  > At 11:06 AM 2000-07-28 -0400, Chris Ridpath wrote:
  > >I'm looking for some clarification on technique 1.3:
  > >
  > >"1.3 Until user agents can automatically read aloud the text equivalent
  of a
  > >visual track, provide an auditory description of the important
  > >of the visual track of a multimedia presentation. [Priority 1]"
  > >
  > >Does this mean that an audio description is required only if there is a
  > >equivalent of a visual track? Or, when is an audio description required?
  > The description is required when it is required, not just when it is
  > An audio description is required when what you miss by not seeing the
  > is [something in the range of (significant, important, critical)].  Once
  > User Agents 'all' do synchronized audible playback of a text description
  > track as a native function, a synchronized text equivalent will meet the
  > requirement for a description.  Until then, provide audio.
  > The requirement for a description is determined by the complexity and
  > importance of the video, not by what the author has done about the
  > requirement.
  > The "until user agents" clause only affect whether this description must
  > in audio or may be only in text.  It has nothing to do with the criteria
  > for when a description is required.
  > Is that the way others recall, too?
  > Al
  > >
  > >Thanks,
  > >Chris
  > >

Charles McCathieNevile    mailto:charles@w3.org    phone: +61 (0) 409 134 136
W3C Web Accessibility Initiative                      http://www.w3.org/WAI
Location: I-cubed, 110 Victoria Street, Carlton VIC 3053
Postal: GPO Box 2476V, Melbourne 3001,  Australia 
Received on Tuesday, 1 August 2000 01:07:55 UTC

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