Need for a text equivalent for audio description

Name: Maria Moore
Email: maria.moore@utas.edu.au
Affiliation: University of Tasmania
Document: UW
Item Number: Understanding Success Criterion 1.2.1
Part of Item: Sufficient Techniques
Comment Type: technical
Summary of Issue: Need for a text equivalent for audio description
Comment (Including rationale for any proposed change):
I am a bit unclear about the note on http://www.w3.org/TR/UNDERSTANDING-WCAG20/media-equiv-av-only-alt.html, that says /Note: /A text equivalent is not required for audio that is provided as an equivalent for video with no audio information. For example, it is not required to caption video description that is provided as an alternative to a silent movie.
> Surely this does not assist deaf-blind people? I would have thought that a text equivalent would be needed.


Proposed Change:
A text equivalent would be needed for the audio description of a video-only file.