WCAG 2.0 AA (Web Content Accessibility Guidelines) requires that audio description be provided for all prerecorded video content in synchronized media. The purpose of audio description is to provide access to the visual information in a video for people who are blind or low vision by adding a sound track that describes what is happening as it is taking place in the video.
3PlayMedia, a popular captioning vendor, is now offering audio description services. Visit the 3PlayMedia website to find more information about the features offered with this service.
Additional vendors of audio description are listed on our Video Captioning Resources page.