video compression
compressed video

   Compression of sequences of images.  Video compression
   algorithms use the fact that there are usually only small
   changes from one "frame" to the next so they only need to
   encode the starting frame and a sequence of differences
   between frames.  This is known as "inter-frame coding" or "3D
   coding".

   MPEG is a committee producing standards in this area and
   also the name of their standard algorithm.  H.261 is
   another standard.

   See also Integrated Information Technology, 3DO,
   full-motion video, Online Media.