Success Criterion 1.2.5: Audio Description (Prerecorded)

Understanding Success Criterion: 

Audio description is provided for all prerecorded video content in synchronized media.

Accessibility Level: 
AA
Intent of Success Criterion: 

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.
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.

Note 1: 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.

Note 2: 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 at higher levels. At Level A in Success Criterion 1.2.3, authors do have the choice of providing either an audio description or
a full text alternative. If they wish to conform at Level AA, under Success Criterion 1.2.5 authors must provide an audio description - a requirement already
met if they chose that alternative for 1.2.3, otherwise an additional requirement. At Level AAA under Success Criterion 1.2.8 they must provide an extended
text description. This is an additional requirement if both 1.2.3 and 1.2.5 were met by providing an audio description only. If 1.2.3 was met, however,
by providing a text description, and the 1.2.5 requirement for an audio description was met, then 1.2.8 does not add new requirements.

Specific Benefits of Success Criterion: 

People who are blind or have low vision as well as those with cognitive limitations who have difficulty interpreting visually what is happening benefit
from audio description of visual information.