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Section: Three DVD planning, encoding, a... > Encoding: Compressing video and audi...

Chapter 14. Encoding: Compressing video and audio for DVD

The marvel of DVD is made possible in part by compressing very large, high-quality video streams into significantly smaller files that fit on a DVD disc. On the average, video files on DVD usually compress down to about six times smaller than their original source files. Amazingly, even at this smaller size, DVD video retains its broadcast-quality appearance. High-quality compressed video is made possible by the MPEG-2 (pronounced em peg two) format.

Audio on DVD can also benefit from compression. Compared to video, original audio streams are much smaller to begin with, but if disc space is tight, compression will help conserve space. Audio is encoded differently from video, using either the Dolby Digital (AC3) or DTS format.


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