Abstract: Server buffer is an application-controlled approach that is widely used in streaming media system. It can improve the quality of video playing by smoothing the transmission jitter of network, decrease the loss of data and optimize the quality of video playing in client. The role of rate control is appended in buffer management section. The rate control optimizes video playing quality, especially for such system that resources are limited, bandwidth is narrowed or real-time property is intensively requested.

Key words: Rate control, MPEG-4, Streaming media, Buffer

摘要： 服务器端缓冲技术是流媒体系统中常用的一种应用控制技术，能够平滑网络抖动，减少数据丢失，提高客户端视频播放质量。该文的缓冲区管理增加了码率控制的功能，控制策略能进一步提高视频质量，特别适合于系统资源有限、带宽窄或强实时性的视频流式传输。

关键词: 码率控制, MPEG-4, 流媒体, 缓冲区