An alternative for time-based media or audio description of the prerecorded video content is provided for synchronized media, except when the media is a media alternative for text and is clearly labeled as such.
Provide an audio description for all prerecorded video content in synchronized media.
Makes visual content accessible to people who are blind or have low vision.
Audio descriptions or media alternatives very rarely exist at all. It often is a problem of not knowing they should be provided.
Check the video and ensure that the alternative
This also relates to criterion 1.2.5. If the video has an audio description, it meets the requirements for both these criteria.