DivX

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Video compression is essential to conserve space on your hard disk, and DivX is one of the leaders in this field. DivX is a type of MPEG-4 codec which provides a higher compression than the older MPEG-1 and MPEG-2 codecs without loss of quality (MPEG-2 is the codec used in DVDs). Many modern DVD players can also play DivX movies.

If you record movies, you should seriously consider using the DivX codec.

Available from http://www.divx.com/divx/windows/