G54: Including a sign language interpreter in the video stream G81: Providing a synchronized video of the sign language interpreter that can be displayed in a different viewport or overlaid on the image by the player SM13: Providing sign language interpretation through synchronized video streams in SMIL 1.0 SM14: Providing sign language interpretation through synchronized video streams in SMIL 2.0 Back to top 1.2.7 Extended Audio Description (Prerecorded) Level AAA Where pauses in foreground audio are insufficient to allow audio descriptions to convey the sense of the video, extended audio description is provided for all prerecorded video content in synchronized media. Understanding 1.2.7 Show Hide techniques and failures for 1.2.7 Sufficient Advisory Failures Sufficient Techniques for Success Criterion 1.2.7 Note: Other techniques may also be sufficient if they meet the success criterion. See Under
standing Techniques. G8: Providing a movie with extended audio descriptions SM1: Adding extended audio description in SMIL 1.0 SM2: Adding extended audio description in SMIL 2.0 Using any player that supports audio and video Advisory Techniques for Success Criterion 1.2.7 H96: Using the track element to provide audio descriptions Back to top 1.2.8 Media Alternative (Prerecorded) Level AAA An alternative for time-based media is provided for all prerecorded synchronized media and for all prerecorded video-only media. Understanding 1.2.8 Show Hide techniques and failures for 1.2.8 Sufficient Advisory Failures Sufficient Techniques for Success Criterion 1.2.8 Note: Other techniques may also be sufficient if they meet the success criterion.