Audio Description or Media Alternative (Prerecorded)
Success Criterion 1.2.3 Level A
Are you providing an optional audio track or text alternative to describe what is happening visually in all video content?
Why is this important
People with visual impairments are unable to see the images (moving or static) in a video. They can miss important information or context-setting clues because they are only able to listen to the accompanying audio. Providing text oraudio descriptions of visual components can help users access and understand the content in its entirety.
Whom does it benefit?
As a person who is blind,
I want an audio or text description of what is happening on the screen in a video
so that I fully understand the content.
As a person who is blind and taking an advanced Chemistry class online,
I want an audio or text description of simulations and videos of lab experiments
so that I understand the purpose of the experiment, complete my assignments, and fully participate in class discussions.
What should you do?
Provide a text description of the visual component.
– or –
- Include a second audio track (“audio description”) that describes what is happening visually on screen.
How do you do it?
Providing a text-based alternative:
- Provide a text version of all audio and visual information in the synchronized media. This includes full descriptions of visual information such as the main visual action, the surrounding context and the physical and facial expressions of the actors. It also includes transcripts of all dialogue and notation of non-speech sounds like laughter or other sounds.
- Provide a link to the text version next to the synchronized media.
Providing Audio Description:
Providing an audio description means that the original media file will need to be altered. A media file with both audio and visual content will need an additional audio track added to describe what is happening visually in the media. See bullets below for key points on providing an audio description.
- Add an additional narration soundtrack (an audio description) that describes important visual details that cannot be understood from the main soundtrack alone.
- The audio description should provide information about actions, characters, scene changes, on-screen text, and other important visual content.
- In standard audio description, the narration is added during existing pauses in dialogue. (See also Success Criterion 1.2.7 Extended Audio Description if pauses are not sufficient for adding the narration)
- Where all of the video information is already provided in existing audio, no additional audio description is necessary.
Need technical guidance?
- SC 1.2.3 Quick Reference
Technical guidance is available for implementing this Success Criterion at the Understanding
Success Criterion 1.2.3: Audio Description or Media Alternative (Prerecorded) page.
Additional Resources to help you:
- Making Audio and Video Media Accessible - W3C Web Accessibility Initiative
- The Ultimate Guide to Audio Description - (3PlayMedia)
- 508 Accessible Videos – How to Make Audio Descriptions - (Digital.gov)
- Examples of media with text based alternatives AND audio descriptions - (W3C Web Accessibility Perspectives videos)