djbaxter
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That document says:
So basically, whether or not they are required for still images, it wouldn't hurt to include them.
This should also apply to videos.1.2.2 Captions (Prerecorded)
Captions are provided for all prerecorded audio content in synchronized media, except when the media is a media alternative for text and is clearly labeled as such.
So basically, whether or not they are required for still images, it wouldn't hurt to include them.