Packet delays in multiplexed video streams

A model for multiplexed video sources and the resulting packet delay distribution for a fluid buffer is given. A measurement driven Markov chain based traffic model for a variable bit rate (VBR) source is used in the analysis. A characterization of the queueing delays of a multiplexed stream comprised of statistically identical sources is undertaken. It is shown that inadequate spectral content in the single source generator matrix manifests in an underestimate of the packet delay probabilities for the multiplexed stream. A reduced dimension generator matrix is derived for the multiplexed stream that amply models the spectral content of the multiplexed sources. The simulated and calculated results using the aforementioned model are shown to agree favorably.