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Captions, Transcripts, and Audio Description | Center for Digital Ac…
https://digitalaccessibility.uchicago.edu/resources/content-creators/captions-transcripts-audio-description/#:~:text=Audio%20Description%20%28AD%29%20is%20narration%20added%20to%20the,critical%20to%20comprehension%20within%20the%20audio%20track%20itself.
Understanding Success Criterion 1.2.5: Audio Description ...
https://www.w3.org/WAI/WCAG21/Understanding/audio-description-prerecorded.html
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.
Understanding Success Criterion 1.2.3: Audio Description ...
https://www.w3.org/WAI/WCAG21/Understanding/audio-description-or-media-alternative-prerecorded
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.
W3C Multimedia Accessibility FAQ
https://www.w3.org/2008/06/video-notes
(Audio description says what's in the visuals, so it's available to people who are blind.) Most W3C video won't need audio description. For example, you do not need audio description for talking heads only, or for text on slides as long as the slide text is woven into what you say. You might need audio description of things like charts and diagrams.
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