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Re: Clarification Of Technique 1.3

From: Charles McCathieNevile <charles@w3.org>
Date: Wed, 2 Aug 2000 21:49:36 -0400 (EDT)
To: Chris Ridpath <chris.ridpath@utoronto.ca>
cc: WAI WCAG List <w3c-wai-gl@w3.org>
Message-ID: <Pine.LNX.4.20.0008022146420.8754-100000@tux.w3.org>
An Audio equivalent to video is necessary in the same situations that a text
equivalent is necessary (ignoring the question of whether it is OK to rely on
synthesising speech from the text equivalent), In My Humble Opinion.

I don't know of anyone doing a lot of audio description (but then I can point
to a lot of other access barriers that people haven't removed yet too).

just my personal thoughts on the topic

Charles McCN

On Wed, 2 Aug 2000, Chris Ridpath wrote:

  Ignoring the "until user agents" clause for a minute, when is an audio
  description necessary?
  
  Does anyone know of a site that provides audio descriptions for their
  multimedia?
  
  Wondering,
  Chris
  
  
  ----- Original Message -----
  From: "Charles McCathieNevile" <charles@w3.org>
  To: "Chris Ridpath" <chris.ridpath@utoronto.ca>
  Cc: "WAI WCAG List" <w3c-wai-gl@w3.org>; "Al Gilman" <asgilman@iamdigex.net>
  Sent: Tuesday, August 01, 2000 1:05 AM
  Subject: Re: Clarification Of Technique 1.3
  
  
  > I guess the real question is whether the until user agents condition in
  WCAG
  > checkpoint 1.3 has been met...
  >
  > Thoughts?
  >
  > 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
  >   video
  >   > 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?
  >
  >   Chris
  >
  >
  >   ----- Original Message -----
  >   From: "Al Gilman" <asgilman@iamdigex.net>
  >   To: "Chris Ridpath" <chris.ridpath@utoronto.ca>; "WAI WCAG List"
  >   <w3c-wai-gl@w3.org>
  >   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
  >   information
  >   > >of the visual track of a multimedia presentation. [Priority 1]"
  >   > >
  >   > >Does this mean that an audio description is required only if there is
  a
  >   text
  >   > >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
  >   provided.
  >   >
  >   > An audio description is required when what you miss by not seeing the
  >   video
  >   > 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
  >   be
  >   > 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
  >
  

--
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 Wednesday, 2 August 2000 21:51:38 GMT

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