Ray-I Chang, Meng Chang Chen, Jan-Ming Ho and Ming-Tat Ko
In this paper, a new method is proposed to optimize stored VBR (variable-bit-rate) video transmission on CBR (constant-bit-rate) channel. The proposed method can minimize both the buffer requirement and work-ahead for a given peak transmission rate. Besides, the network utilization is maximized with the minimum service connection time. These problem parameters are not optimized at the same time in the conventional approaches. In this paper, we at first present the Lazy scheme to determine the minimum buffer and work-ahead required for a given peak transmission rate. Then, the Aggressive scheme is applied to maximize the system resource utilization (e.g., network bandwidth). The proposed schemes can be easily extended to transmit the VBR video with the minimum rate variability, or to resolve the buffer-constrained transmission problem with the minimum peak transmission rate for a given buffer size. Experiments to many well-known benchmark video traces show that the proposed method can obtain better network utilization and requires less memory buffer than the conventional approaches.