For each feature that transmits, converts or records a pre-recorded time-based media with an audio description, is at the end of the process the audio description correctly preserved?

Tests

1. 4.16.1

   For each feature that transmits, converts or records pre-recorded time-based media with audio description, at the end of the process does the audio description meet these conditions?

   The audio description is present.
   The audio description can be activated.
   The audio description is correctly synchronised.