The intent of this Success Criterion is to provide people who are blind or visually impaired access to the visual information in a synchronized media presentation. This Success Criterion describes two approaches, either of which can be used.
-One approach is to provide audio description of the video content. The audio description augments the audio portion of the presentation with the information needed when the - video portion is not available. During existing pauses in dialogue, audio description - provides information about actions, characters, scene changes, and on-screen text - that are important and are not described or spoken in the main sound track. + video portion is not available. Audio description provides information about actions, + characters, scene changes, and on-screen text that is important and not described + or spoken in the main sound track. Audio description is added during existing + pauses in the dialogue.
-The second approach involves providing all of the information in the synchronized media (both visual and auditory) in text form. An alternative for time-based media provides a running description of all that is going on in the synchronized media content. @@ -48,21 +44,18 @@
If the original audio does not have sufficient pauses in the dialogue, authors need to provide + an appropriate alternative instead in order to pass this criterion. +
If there is any interaction as part of the synchronized media presentation (e.g., "press now to answer the question") then the alternative for time-based media would provide hyperlinks or whatever is needed to provide the same functionality.
-For 1.2.3, 1.2.5, and 1.2.7, if all of the information in the video track is already - provided in the audio track, no audio description is necessary. - - + provided in the audio track, no audio description is necessary.
-1.2.3, 1.2.5, and 1.2.8 overlap somewhat with each other. This is to give the author some choice at the minimum conformance level, and to provide additional requirements @@ -76,61 +69,40 @@
See also 1.2.5 Audio Description (Prerecorded), 1.2.7 Extended Audio Description (Prerecorded) and 1.2.8 Media Alternative (Prerecorded).
- -- Describer: A title, "Teaching Evolution Case Studies. Bonnie Chen." A teacher shows photographs - of birds with long, thin beaks. -
- -- Bonnie Chen: "These photos were all taken at the Everglades." -
- -- Describer: The teacher hands each student two flat, thin wooden sticks. -
- -- Bonnie Chen: "Today you will pretend to be a species of wading bird that has a beak like this." -
- -- Describer: The teacher holds two of the sticks to her mouth making the shape of a beak. -
- ++Describer: A title, "Teaching Evolution Case Studies. Bonnie Chen." A teacher shows photographs of birds with long, thin beaks.
+Bonnie Chen: "These photos were all taken at the Everglades."
+Describer: The teacher hands each student two flat, thin wooden sticks.
+Bonnie Chen: "Today you will pretend to be a species of wading bird that has a beak like this."
+Describer: The teacher holds two of the sticks to her mouth making the shape of a beak.
+
Transcript of audio based on the first few minutes of "Teaching Evolution Case Studies, Bonnie Chen" (copyright WGBH and Clear Blue Sky Productions, Inc.)
-- - Providing an alternative for time-based media including any interaction using one of the following techniques -
- +Providing an alternative for time-based media including any interaction using one of the following techniques
-Linking to the alternative for time-based media using one of the following techniques - -
- +Linking to the alternative for time-based media using one of the following techniques
-- - Providing a version of a movie with audio descriptions using one of the following: -
- +Providing a version of a movie with audio descriptions using one of the following:
- - Providing a movie with extended audio descriptions using one of the following: -
- +Providing a movie with extended audio descriptions using one of the following: