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本文对ＶＯＤ视频服务器中同时为多个点播用户服务的比例服务策略进行了改进，比例服务策略在一个服务循环中，每路视频流所回取的数据块数与该流的播放帧率成正比．当用该算法算出的回取块数不为整数时，利用交替改变读取数据块数的方法，对连续的服务循环中所读出的各条流的数据块数分别进行细调，以获得同时为尽量多点播用户提供服务，同时也使所需的缓冲器大小以及新允许服务的视频流的起动时迟较小．通过增强比例服务算法的动态适应性，可透明地实现点播用户数的增减（即不影响在点播视频的连续播放），有效地实现允许控制．
In this paper, the VOD video server for multiple simultaneous on-demand service users to improve the proportion of service strategy, the proportion of service strategy in a service cycle, the number of blocks each video stream is retrieved and the playback rate is proportional to the stream frame . When the number of fetch blocks calculated by this algorithm is not an integer, the number of blocks read for each stream read in consecutive service cycles is finely adjusted by alternately changing the number of read data blocks to obtain While serving as many on-demand subscribers as possible, while keeping the required buffer size and timing of startup of new allowed service video streams. By enhancing the dynamic adaptability of the proportional service algorithm, the number of on-demand subscribers can be transparently increased and decreased (that is, the continuous play of video on demand is not affected), and the allowable control is effectively implemented.