W3C home > Mailing lists > Public > w3c-wai-ig@w3.org > January to March 2016

Re: Meaning of "synchronized media"

From: Andrew Kirkpatrick <akirkpat@adobe.com>
Date: Fri, 5 Feb 2016 15:52:47 +0000
To: Robin Hillman <robinhillman@tactica.ca>
CC: "w3c-wai-ig@w3.org" <w3c-wai-ig@w3.org>
Message-ID: <0AF67340-A169-46A0-BEEC-AE3590E1E425@adobe.com>
Yes, that all sounds right.

I’m not sure that it is the trickiest, but it might be the most expensive.  It is very much worth getting experienced help in creating the audio descriptions – writing high quality audio description is a skill…


From: Robin Hillman <robinhillman@tactica.ca<mailto:robinhillman@tactica.ca>>
Date: Friday, February 5, 2016 at 10:20
To: Andrew Kirkpatrick <akirkpat@adobe.com<mailto:akirkpat@adobe.com>>
Cc: "w3c-wai-ig@w3.org<mailto:w3c-wai-ig@w3.org>" <w3c-wai-ig@w3.org<mailto:w3c-wai-ig@w3.org>>
Subject: Re: Meaning of "synchronized media"

Thanks very much, Andrew.

So then I understand that most of what people normally refer to as "videos" (ie: video with audio) would be classified as synchronized media.

And I see the only way to meet this criteria is to have audio descriptions.

Except if there's no important time based information that would warrant audio descriptions:

This is probably the trickiest criteria to meet in level AA...

-Robin Hillman

On Fri, Feb 5, 2016 at 8:42 AM, Andrew Kirkpatrick <akirkpat@adobe.com<mailto:akirkpat@adobe.com>> wrote:
Synchronized media refers to the situation where there are multiple media types that are shown in a time-dependent manner.

An audio file on a web page is not synchronized media, and nor is a video file that doesn’t have audio. But if you play these together and the timing of one depends on the other in order to understand the content, then these are “synchronized media”.  Similarly, if you had an audio file and a synchronized sequence of images that appears at the same time, that would constitute synchronized media.  In many cases like this last example, the image sequence might be converted into a proper video file format, probably including the audio in that file as well, but this doesn’t have to happen. The term synchronized media establishes that the success criteria aren’t just referring to video with audio needing captions and audio descriptions, there are other cases where these are needed to provide access.


Andrew Kirkpatrick
Group Product Manager, Accessibility



From: Robin Hillman <robinhillman@tactica.ca<mailto:robinhillman@tactica.ca>>
Date: Friday, February 5, 2016 at 09:14
To: "w3c-wai-ig@w3.org<mailto:w3c-wai-ig@w3.org>" <w3c-wai-ig@w3.org<mailto:w3c-wai-ig@w3.org>>
Subject: Meaning of "synchronized media"
Resent-From: <w3c-wai-ig@w3.org<mailto:w3c-wai-ig@w3.org>>
Resent-Date: Friday, February 5, 2016 at 09:14

Hello --
I have a question about the meaning of "synchronized media", because the terms used seem very specific. This is related to SC 1.2.5 in WCAG 2.0: https://www.w3.org/TR/UNDERSTANDING-WCAG20/media-equiv-audio-desc-only.html

It defines synchronized media as:
"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"

My confusion is around "audio or video synchronized with another format" -- what is "another format"? What would some examples of synchronized media be? Does this necessarily include something like a movie?

So does this mean that all videos (I mean, audio & video, like what you would see on youtube) would require described audio in order to meet this SC?

-Robin Hillman

Robin Hillman
Tactica Interactive

354 Marion Street
Winnipeg, Manitoba R2H 0V3
Phone: 204.233.0694 x304<tel:204.233.0694%20x304>

Visit us at www.tactica.ca<http://www.tactica.ca> | Follow us on Twitter @tactica and Facebook
Tactica creates meaningful interactive experiences that enrich people's lives through websites, mobile apps, games, and social media.
This message is intended only for the named recipients. This message may contain information that is privileged, confidential or exempt from disclosure under applicable law. Any dissemination or copying of this message by anyone other than a named recipient is strictly prohibited. If you are not a named recipient or an employee or agent responsible for delivering this message to a named recipient, please notify us immediately by telephone at 204.223.0694<tel:204.223.0694> and permanently destroy this message and any copies you may have.
Received on Friday, 5 February 2016 15:53:20 UTC

This archive was generated by hypermail 2.3.1 : Friday, 5 February 2016 15:53:20 UTC