视频流多播系统的设计和实现

流模式是一种重要的多媒体数据传输和应用模式。针对数据广播平台等应用，设计并实现了一个视频流媒体多播系统。该系统采用B／S结构，由服务器端的节目编排子系统和节目播出服务子系统以及节目接收客户端的视频播放子系统三部分组成。服务器采用新视频编码标准H．264提高编码效率，后预测算法进行变码率流式传输的调度，以及智能化功能。客户端采用多播组技术、缓存管理技术、播放状态控制技术、COM组件嵌入技术。服务器和播放器均有支持数字权限管理的接口。系统的运行表明符合预期目标。

Design and Implement of Video Streaming Multicast System

Multimedia streaming is an important mode for multimedia data transport and applications. A video streaming multicast system was designed and implemented for applications such as data broadcast and TV. Employing Brower/Server(B/S) architecture, the system consists of three subsystems, two in the server, named as program authoring subsystem and program broadcasting subsystem respectively, and one in receiver, named as player. In server, a new video encoding/decoding standard, H.264, is applied to improve encoding efficiency, an algorithm called backward-prediction proposed to schedule the variable bitrate streaming transfer, and some intelligent functions implemented. At the receiver some techniques such as multicasting management, buffer management, play states control and COM embedding are employed. There have DRM interfaces in both server and receiver. The system runs well as expected.