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The Big Squeeze: MPEG-2

You may be wondering why we couldn't just put movies onto the existing CD format, seeing as how it works so well with music. The problem is a matter of file size: digital video takes up many more times the space of CD audio files and there is simply not enough room to store a high-quality, full-length (90+ minute) movie on a 700 MB CD. Heck, there's not even enough room on a 4.37 GB DVD to store a full-length digital movie, unless it's gone through a special squeezing process beforehand called encoding. All DVD video must be encoded into either the MPEG-2 or MPEG-1 format before being written to a DVD disc. Both MPEG formats allow a digital movie file that was originally very large to be squeezed down to something quite small.


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