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Additional Features

We've covered most of the outwardly visible functions of a DVD-Video disc, but there are other important features of the DVD specification that you wouldn't readily notice when you view a disc normally on your television.

Closed Captions

Closed Captioning is an accessibility feature that exists for the benefit of people who are deaf or hearing impaired, allowing them to read spoken dialog on a DVD. Like subtitles, Closed Captioned dialogue appears as text at the bottom of a television screen, but it's not a subpicture overlay. Instead, DVD Closed Captions are text instructions embedded in an MPEG-2 video stream. The data is sent from the DVD to the player, and then decoded and displayed by a television itself. Closed Captions will not only display text of the spoken dialogue—it also identifies the speakers and includes sound effect -descriptions.


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