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Many. Basically, MPEG-1 is a compression system that focuses on storing video in a hard disk, that is to say, an "error-free" environment and only is valid for low resolution images. On the other hand, MPEG-2 not only improves the compression factor, but also enhances the capabilities of the antecessor MPEG-1. MPEG-2 can be used not only to store videos (e.g. a DVD) but also can be used for broadcasting. Today's digital television (terrestrial, cable and satellite) uses the compression and signalling of MPEG-2, adapted as international organizations (ATSC, DVB) reccomend. dmb_1

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