Video and audio controls must be keyboard accessible. Any content that plays automatically must stop after 3 seconds. The use of the iFrames to embed video content is generally considered acceptable. Flash content may require special scripting or tools to ensure accessibility.
Captions & Audio Description
Video content usually requires captions and a text transcript.
Captions provide alternative audio content for deaf users and are usually provided as a separate text file synchronised to the video content. Caption content should assume that the user cannot hear anything at all. However it is common for captions to be accessed by users with no hearing impairment at all as they provide enhanced comprehension, flexibility in noisy environments and the ability to search multimedia content.
More information on creating captions can be found on the Captions page.
Audio Description provides alternative visual content to blind users embedded into the audio track. This information includes setting information, sound effects, actions and expressions etc.
A text transcript makes video and audio content accessible to deaf and blind users and can be on a separate web page. Transcripts must contain the full dialogue, setting information, sound effects, actions and expressions, graphics and any other useful information.
More information on creating transcripts can be found on the Transcripts page.