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Video Compression

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Compression uses mathematic algorithms to store large amounts of digital data in a relatively small amount of space. There are two main kinds of compression, lossy, and loss-less. Loss-less compression includes the RAR/ZIP format, where the original data is compressed, and when de-compressed, the data has not changed. Lossy compression includes most video compression formats, such as JPEG, MPEG-1/2/4 - this means that when the digital data is compresssed and de-compressed, it is no longer the same as the original (usually denoting a loss of quality).