基于P2P的视频点播系统设计

Design of P2P-based VOD System

随着计算机网络和多媒体技术的发展,人们对网络视频点播的需求越来越高,高清、流畅和互动已经成为人们对视频点播的要求,在传统的C/S模式的视频点播系统中,客户终端要观看视频都需要依赖中心化的视频服务器,而且对带宽的要求越来越大,视频服务器就容易成为网络的瓶颈,当网络规模越大时,服务器的负担就会越重,一旦服务器崩溃,整个网络就会瘫痪。另外由于服务器的能力有限,往往不能及时地对每一个客户端的请求作出响应,因此会造成资源利用率低下。P2P网络中没有中心化的服务器,不存在系统瓶颈,每个节点既充当客户端又充当服务器端,因而具有很高的资源利用率。

With the development of network and multimedia technique,the demand of people on the network VOD is more and more high.High definition,fluency and interaction have become the requirements of people to VOD in the traditional C/S model of VOD system,client terminal to watch video need to rely on the center of the video server,and the higher bandwidth demand,the video server the easilier becomes the bottleneck of network,when the network size is large,the burden on the server will be more heavy,once the server is crash,the entire network will be paralysis.In addition the server＇s capacity is limited,often cannot respond timely to every client,it will cause the utilization rate of resources is low.While the P2P network does not have a centralized server,and the bottleneck of the system is not exist,each node acts as both a client and a server,thus it has higher resource utilization rate.