Research And Implement Of Proxy Based VOD System

With the quick development of Internet and especially the prevalence of broad band network these years, stream media is a hotspot of development in recent years. VOD system is one of the most popular applications in stream media field. All kind of VOD applications will bring new chance and hope to INTERNET and 3G network; therefore the research of related technology is great important.The paper,"Research and Implement of Proxy Based VOD System"is under the topic of"Non-Real-Time Education System"which is one task of MOST's(Ministry of Science and Technology ) National Key And Technologies R&D Project of the Tenth five-yearPlan. This paper is based on stream media protocol and MPEG-4 standard, depth research in proxy based VOD system,finally a proxy based VOD system prototype is implemented,which has own copyright.The paper begins with the framework of proxy based VOD system and proxy-caching technology. And then, in the base of stream media protocol technology, the research on implement of protocol in proxy is introduced. Afterwards, in the base of MPEG-4 standard and network transmission technology, the research on streaming encryption based proxy is introduced.Combining the research of related theories, the paper design and implement a proxy based VOD system .The VOD system adopt RTP/RTSP/SDP protocol, sustains MPEG-4 natural audio/video data being tramsformed and controlled by RTP/RTSP protocol, prefix-caching functiong,fast streaming encryption function and other functions are implemented in proxy.At the end of this paper,we give the concrete scheme of improvement and consummation for the proxy based VOD system.