P2P技术在视频网格中的应用研究

Application of P2P Techniques in Video Grid

研究优化视频效率问题,现有视频网格结构可伸缩性不足的缺点,使系统效率降低。引入P2P技术将客户端主机中缓存的视频流数据发送给同一子网或者相邻子网中的客户端主机,缩短网络中视频流数据的传送路径,节约网络干线的数据流量,降低区域服务器的负载,提高视频网格的可伸缩性。提出了融入P2P技术的PGVOD系统的结构设计方案和节点的运行模式,描述了LCN的设计及其动态更新过程。最后通过视频网格模拟器VGSim将PGVOD与基于C/S模式的视频网格系统进行对比,结果表明,能够有效减少网络中的视频流流量,提高系统的吞吐量和性能。

In current video grid,the scalability is low.In this paper,P2P techniques were imported to transfer data of video stream buffered in client computers to other client computers which located in the same or neighboring subnet,to shorten the path of video data stream,and the transmission path of data of video streams in main stem network was also reduced.So,the payloads of POP servers were depressed and the scalability of video grid was improved.A structure design scheme of PGVOD system with P2P techniques and its access mode of node were proposed.The process of designing,dynamic updating and managing of LCN were described.Then the paper compared PGVOD with video grid of C/S structure by the VGSim,a simulator of video grid.Tthe result shows that PGVOD can cut down the data of video streams in networks,and improve the throughput and performance of system.