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Re: Unsynchronised audio and video content

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From: Patrick H. Lauke
Date: May 27, 2020 6:38AM

On 27/05/2020 13:16, Steve Green wrote:
> My interpretation of WCAG's definition of "synchronised media" is that the audio and video do need to be synchronised, such as when you have a talking head i.e. the relative timing of the audio and video is important. I don't believe that merely having audio and video present at the same time is sufficient to constitute "synchronised media" if their relative timing does not matter. It would simply be "multimedia". The word "synchronised" has a very specific meaning and I don't think we can simply ignore it.
>

https://www.w3.org/TR/WCAG21/#dfn-synchronized-media
synchronized media: audio or video synchronized with another format for
presenting information...

I'm fairly sure a video with an audio track counts as "synchronized
media", irrespective of whether the exact timing / synchronisation
between the two is important or not. I can't find any clarification
anywhere that would suggest otherwise.

See also understanding documents like
https://www.w3.org/WAI/WCAG21/Understanding/captions-prerecorded.html
https://www.w3.org/WAI/WCAG21/Understanding/audio-description-or-media-alternative-prerecorded.html
https://www.w3.org/WAI/WCAG21/Understanding/captions-live.html etc which
don't really make a specific distinction here between what does and
doesn't count as "synchronised" audio+video.

P
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Patrick H. Lauke

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