A Video Codec Control Scheme for ATM Networks

Abstract

The cost-effective transfer of coded video over ATM networks demands that network parameter values be suitably decided for each type of video sequence. This paper first describes the relationship between delay and declared values of peak and average bitrate A video codec control scheme based on this relationship is introduced. Several video sequences used in standardization activities are evaluated from the standpoint of the fraction of video frames that are not restricted due to the declared traffic parameters. As a result, it becomes clear that the peak rate should be twice the average bitrate. An algorithm is introduced to select the transfer mode, variable bitrate or constant bitrate, for video codec terminals given the type of video sequence and the level of quality required The algorithm also describes the suitable values of the average bitrate.