WCAG 2.1 - SC 1.2.5 Audio Description (Prerecorded)

Provide an additional audio track for prerecorded video content describing what is happening on-screen, synchronized with the screen action.

Official Requirements:

1.2.5 Audio Description (Prerecorded): Audio description is provided for all prerecorded video content in synchronized media. (Level AA)

How to fix:

Provide an additional audio track for prerecorded video content describing what is happening on-screen, synchronized with the screen action.