An adaptive QoS control method in the multi-channel communication of the MPEG video data streams

We propose the new scaling and bandwidth allocation method for multistream MPEG video transmission. First, we propose hybrid scaling method which applies both re-encoding and reduction of DCT coefficient, and show that relation between SNR degradation and coded bitrate can be approximated by piecewise line. Then, we obtain the optimum bandwidth allocation algorithm for multistream video transmission, based on the strategy that the largest SNR degradation should be minimum. Furthermore, a practical bandwidth allocation method is proposed for video streams, which contain scene changes. Computer simulation shows that the proposed method can decrease largest distortion of MPEG video streams.