Modeling teleconference traffic from VBR video coders

The authors analyze teleconference traffic, with moderate motion and scene changes, generated by different video codecs. These codecs differ in several aspects of coding, such as in the use of DCT and motion compensation. The results are that, even when traffic is generated using different coding schemes, the number of cells per frame can be described by a gamma (or equivalently negative binomial) distribution and a DAR(1) model determined by three traffic parameters (the mean, variance, and correlation) can be used to accurately model the source. The main contribution of the paper is in showing that the authors´ previously published results on source modeling and marginal distributions, which were based on analysis of traffic generated by one type of coder, hold for coders which differ in various ways and particularly differ in the use of motion compensation