流媒体技术是在数据网络上以流的方式传输多媒体信息技术。近年来,在宽带网络的高速发展和用户需求的驱动下,流媒体应用已经和3G、NGN 联系在一起,受到越来越多的关注。与传统播放方式不同,流媒体在播放前并不下载整个文件,只将部分内容缓存,使流媒体数据流边传送边播放,节省下载等待时间和存储空间。流媒体数据流具有三个特点:连续性、实时性、时序性,即其数据流具有严格的前后时序关系。除了宽带网络外,流媒体技术还可以广泛地应用于其他网络,例如无线流媒体传输是3G 网络的主要应用之一。在 NGN网络中,流媒体也扮演重要的角色。目前,应用提供商、内容开发商、业务支撑系统运营商、网络提供商、用户构成了完整的产业链。其中,用户最终获得宽带流媒体 Streaming media technology is the flow of multimedia information technology in the data network. In recent years, driven by the rapid development of broadband networks and user demands, streaming media applications have been linked to 3G and NGN and are receiving more and more attention. Unlike traditional playback, streaming media does not download the whole file before it is played, only part of the content is cached so that streaming media data can be transmitted while streaming, saving download waiting time and storage space. Streaming data stream has three characteristics: continuity, real-time, timing, that is, its data stream with strict timing relationship. In addition to broadband networks, streaming media technology can also be widely used in other networks, such as wireless streaming media transmission is one of the main applications of 3G networks. In the NGN network, streaming media also plays an important role. At present, application providers, content developers, business support system operators, network providers, users constitute a complete industrial chain. Among them, the user eventually won the broadband streaming media