分布式视频转码服务调度算法研究

Research on Scheduling Algorithms for Distributed Video Transcoding Service

针对分布式环境下视频转码服务的任务请求自适应接收问题以及处理后视频序列分段向客户端的端传输控制问题,通过分析视频转码处理对资源占用的特点以及流式媒体服务实现的过程,提出了基于处理节点资源与客户信道质量反馈的视频转码任务自适应接收策略和用于实现客户端流畅视频服务的视频任务分段传输控制算法。实验表明,相比现有算法,该自适应客户请求接入策略能够依据客户端的信道质量选择最适合的任务版本;在用户播放缓冲区有限的条件下,提出的传输控制算法可以达到更小的任务失败几率。

To solve the problem of task accessing and operated task video sequence segment backward transmission control of distributed transcoding service, through analyzing the feature of resource occupation of video transcoding and the process of stream media service,a feedback based optimal video transcoding task assignment algorithm and a novel task segment data transmission control scheme for smooth stream service providing to clients are pro- posed in this article. The results of experiment show that the self - adaptive request access strategy can choose the most suitable task version for the clients according to their channel quality feedback and the transmission control scheme will take a lower task failure rate under the limited client video buff condition.