WebAIM - Web Accessibility In Mind

E-mail List Archives

Re: Unsynchronised audio and video content


From: Sailesh Panchang
Date: May 27, 2020 1:23PM

>The video content is entirely decorative fluff except for a medical disclaimer that is >displayed for a few seconds.
Yes I can relate to that: like a person who is talking and the
visuals generelly cover the environment being talked about simply as a
background. The audio is not really narrating the visuals nor is in
sync with the visual and I would not regard it as synchronized media.
The exact same audio content can be ported (not my expertise) with a
background video content of a hospital / medical setting of another
What is needed is the disclaimer to be portrayed on screen as text or
as a transcript. Also some short text equivalent that conveys what
setting / environment the audio is recorded in. It does not have to be
an exhaustive screen by screen portrayal of the video content. And
of course the captions or transcript for the audio content.

Timing is certainly significant for synchronized media. If the audio
and visual content are not in sync in a time-based media, then that
media would not be very usable even by non-PWD regardless of
accessibility of that media.
So a movie clip would be synchronized media where the audio content
has to be in sync with the visual content on a screen by screen
Three relevant Definitions from WCAG 2.0/2.1:
Synchronized media:
audio or video synchronized with another format for presenting
information and/or with time-based interactive components, unless the
media is a media alternative for text that is clearly labeled as such
Alternative for time-based media
document including correctly sequenced text descriptions of time-based
visual and auditory information and providing a means for achieving
the outcomes of any time-based interaction
Note: A screenplay used to create the synchronized media content would
meet this definition only if it was corrected to accurately represent
the final synchronized media after editing.
Captions: synchronized visual and/or text alternative for both speech
and non-speech audio information needed to understand the media


On 5/27/20, glen walker < <EMAIL REMOVED> > wrote:
> > In the videos I am currently dealing with, the audio track contains all
> the important information. The video content is entirely decorative fluff
> except for a medical disclaimer that is displayed for a few seconds.
> My take is that if you can't play the audio separately from the video, then
> they're synchronized. Whether the video is just fluff, if the timing of
> the video plays along with the audio, it's synchronized.
> > > > >

Sailesh Panchang
Principal Accessibility Consultant
Deque Systems Inc
381 Elden Street, Suite 2000, Herndon, VA 20170
Mobile: 571-344-1765