earticle

영어

Although standard DiffServ (Differentiated services) framework allows simultaneous transmission of video and data streams, it can not distinguish the importance of different video frames. Consequently, more received video packets may not lead to better decoded video quality. In this paper a novel inner-priority based video streaming scheme and its corresponding IP policy are proposed. Using IP policy, the importance of video packet could be recognized and corresponding RED queue will be assigned. Comprehensive evaluation results show that the average PSNR of IP policy is much higher than that of traditional policy in most cases and RED parameters settings influence the performance of IP policy. The best choice of RED parameters settings depends on many factors, including available bandwidth of the video stream, coding structure of video sequence, and the employed scheduling mode and dropping mode.