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为了能实时地跟踪网络时延的变化,减少因时延抖动造成的对播放质量的影响,该文提出一种自适应多媒体播放(AMP)的算法。该算法利用Chebyshev不等式和时延抖动的统计特性,预测适宜的播放速度,同时利用缓冲区的状态共同调节播放速度。计算机仿真结果表明:该算法在有效地减小缓冲区溢出可能的同时可以实时地跟踪网络延时的变化改变播放速度,播放速度的方差可以减少40%~80%;用主观视觉观测,抑制抖动的效果比原有的AMP算法更好。
In order to track the change of network delay in real time and reduce the impact of delay jitter on the playback quality, this paper proposes an adaptive multimedia playback (AMP) algorithm. The algorithm uses the statistical properties of Chebyshev inequality and delay jitter to predict the appropriate playback speed, and simultaneously adjusts the playback speed by using the state of the buffer. Computer simulation results show that the proposed algorithm can effectively reduce the buffer overflow and track the real-time changes of the network delay to change the playback speed. The variance of the playback speed can be reduced by 40% ~ 80%. Subjective visual observation can restrain jitter The effect is better than the original AMP algorithm.