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The audio content of multimedia presentations is inaccessible to people who are unable to hear. If there is content presented auditorially, the accessibility solution is captioning that provides a synchronized text alternative to the audio track. For additional general information about captioning, see How do I make multimedia accessible?

Multimedia presentations can enrich education and enhance learning for many students, but it can also pose barriers for others. Audio and video are inaccessible to people who are unable to hear, andÌývideo is inaccessible to people who are unable to see critical information that is presented visually. Other students are impacted by low bandwidth Internet connections. Multimedia players can pose barriers as well if the player controls require use of a mouse or if they are not labeled sufficiently to be usable by screen reader users.

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There are many vendors who provide a wide range of captioning services. One of the best resources for selecting a vendor is the , which, in collaboration with the administered by the , officially approves captioning service vendors. Approved vendors are listed in the document .

The Ìýrequires that public programs and services,Ìýincluding educational institutions and opportunities, be accessible to people with disabilities. For example, with captions, the content of a videotape shown in a course might be made accessible to a personÌýwho is deaf. If the product is not captioned, access to the content would need to be provided in another way, perhaps with a sign language interpreter.

Captioning is usually considered when the video product is complete, if at all. Instead, the production should be filmed so that critical content does not appear where captioning will cover it (usually at the bottom of the screen). Captions should describe all of the visual content, including nonspeech noises. Suggestions for making attractive and functional captions include the following:

Yes, captions can be added to a video presentation that has already been published to make it accessible to people who are deaf or hard of hearing.

The first step in adding captions to a video is to transcribe it, or obtain a transcript if one already exists. The second step is to synchronize the transcript with the video. There are various tools and techniques for doing this, depending on the media type.