基于播放速度预测的自适应多媒体播放算法  

Playout speed prediction-based adaptive media playout scheme

作　　者：李航[1] 郑华[1] 崔慧娟[1] 唐昆[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2008年第4期530-533,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(60572081)

摘　　要：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。An adaptive media playout （AMP） scheme was developed which adaptively follows changes of the network delay to reduce the effect of delay jitter on the visual quality. The scheme utilizes the Chebychev inequality to analyze the statistical characteristics of the jitter to predict the best playout speed, using the current buffer status to adjust the playout speed. Simulations show that the algorithm effectively reduces the likelihood of buffer outage and adaptively follows changes of the network delay. This algorithm, whose de-jitter effect is better than that of the original AMP method using subjective vision, reduces the variation of the playout speed by 40% - 80%.

关 键 词：多媒体通信 时延抖动 缓冲 自适应媒体播放 

分 类 号：TN919.8[电子电信—通信与信息系统]