STATISTICAL MULTIPLEXING OF MULTIPLE MPEG-2 VIDEO PROGRAMS IN A SINGLE-CHANNEL

This paper discusses rate control for statistically multiplexed (stat mux) systems and derives the fundamental equations governing encoder a nd decoder buffer fullness. An example of how these equations can be u sed to determine the sizes of the encoder and decoder buffers is prese nted Two fundamental approaches to stat mux rate control are also disc ussed: the look-ahead approach and the feedback approach. in the look- ahead approach, statistics computed by a preprocessor are used to adju st the bit rate prior to coding the frames in question, In the feedbac k approach, statistics generated by the encoder as a by-product of the compression process are used to control the future bit-rate allocatio n. Finally, simulation results for one stat mux implementation are pre sented.