Sign Language for Video: The Decisions That Matter
Providing sign language interpretation of the audio in prerecorded video, usually as an interpreter shown in a window alongside the main picture.
Marcus Adeyemi
Why does it matter?
For many deaf people sign language is their first language and captions in written English are a second language, which is why WCAG includes sign language at level AAA.
What are the numbers?
- WCAG 1.2.6 Sign Language, AAA sign language interpretation is provided for prerecorded audio in synchronized media
- Language American Sign Language is a distinct language with its own grammar, not a signed form of English
- Presentation the interpreter should be large enough to read hand shapes and facial expressions
- Captions still needed alongside interpretation, since not all deaf viewers sign
What should I do?
- Use qualified, certified interpreters
- Frame the interpreter large enough to read clearly on phones
- Keep the interpreter window in a consistent position
- Provide captions as well as interpretation
- Involve deaf reviewers in checking the result
What should I avoid?
Avoid:
- Interpreter windows too small to read
- Cropping hands or face in the interpreter shot
- Assuming captions make interpretation unnecessary
- Placing the window over important visual content
When should I get help?
Short answer Bring in help when producing public service, health or government video, or when deaf audiences are a core audience.
Where this comes from
- W3C Web Accessibility Initiative — Understanding SC 1.2.6 Sign Language (Prerecorded)
- ADA.gov — Effective communication
The figures and practices above come from the sources listed.
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