While JPEG takes more or less the same amount of time to compress and decompress, the speed of MPEG compression varies.

Like JPEG, MPEG compresses by removing redundant information.

MPEG compressed movies run faster and take less space.

JPEG performs just intraframe compression

It removes redundant information from within a single frame.

MPEG also performs interframe compression.

MPEG doesn't even store the information that doesn't change from frame to frame (background) once it has compressed and stored it.

It samples every 15 frames (i.e., every half second).

There are three parts to the MPEG standard:

Video encoding,

Audio encoding,

Synchronization of these two is performed primarily by MPEG Audio.

The goal is to be able to compress full-motion video so that it can be shown at a rate of 1.5 Megabits (million bits) per second with minimal quality degradation.