【作者】 王琦；

【导师】 吉逸；

【作者基本信息】 东南大学 ， 计算机系统结构， 2006， 硕士

【摘要】 随着互联网的快速发展和宽带网络的逐步普及,流媒体最近几年成为了发展的热点,而视频点播系统(VOD系统)则是目前流媒体应用的主要表现形式之一。各种形式的VOD应用将给INTERNET和3G无线网络带来新一轮的商机,因此与之相关技术的研究具有非常重要的应用价值。“基于代理服务器的VOD系统研究及实现”是结合科技部十五重大科技攻关项目“网络教育关键技术及示范工程”中的“非实时教学系统”课题进行的。论文在研究流媒体协议和MPEG-4标准的基础上,对基于代理服务器的VOD系统框架进行深入研究,开发了基于代理服务器的VOD原型系统。论文首先介绍了基于代理服务器的VOD系统结构和代理缓存技术,然后介绍了基于代理服务器的VOD系统使用的流媒体协议,并展开对代理服务器上协议实现的研究,紧接着论文介绍了MPEG-4标准和MPEG-4流的传输控制技术,并对代理服务器上数据流加密进行了研究。结合对相关理论的研究,论文介绍了自己设计和实现的一个基于代理服务器的VOD系统,对系统的整体架构、系统的功能模块划分和功能模块实现进行了详细介绍。该系统完全遵守标准流媒体协议RTP/RTCP、RTSP和SDP,支持MPEG-4数据在标准流媒体协议上的传输和控制,并在代理服务器上上实现了前缀缓存、媒体流加密等功能。在本文的最后还对系统进行了性能分析并且对系统的改进做了一些探讨。更多还原

【Abstract】 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.更多还原