网络环境下视频连续播放控制算法

A CONTROL SCHEME FOR VIDEO CONTINUOUS PLAYBACK IN NETWORK ENVIRONMENT

从信宿端的角度来解决视频媒体的同步连续播放,提出了一种自适应的动态媒体播放算法。分析了马尔可夫调制的泊松到达情况下的排队模型,给出了缓冲区门限的选取原则。最后提出了通过用不连续性和播放失真的方差来衡量同步性能方法,实验结果表明,该算法的同步性能优于Yuang的算法。通过选择合适的参数,可有效地防止缓冲区下溢造成的播放停顿以及缓冲区上溢造成的播放跳跃,从而实现同步平滑播放。

An improved dynamic playback algorithm is proposed in order to keep multimedia playing smoothly, which deals with the problem from the perspective of an end system. In the algorithm, playback rates of multimedia are variable according to the occupied buffer level with an intention of eliminating buffer underflow or overflow. The playback rates are chosen based on the requirement of the intra-media synchronization. To determine the thresholds of the occupied buffer level, a queuing model is established. Based on the analytic results, suitable thresholds can be determined according to the system parameters. Simulation results show the algorithm wins an advantage over Yuang＇s.