中文摘要：实时视频流技术在可视电话、远程教育、视频点播等方面得到广泛应用。网络实时视频系统一般分为4 大模
块：采集子系统、编码压缩子系统、传输控制子系统和输出子系统。其中传输控制子系统是实时视频流的一项关键核
心技术。提出了基于RTP/RTCP 协议构建实时视频传输控制子系统，传输层通信使用UDP Socket 完成。对于RTP/RTCP
协议的封装和UDP Socket 使用标准C++和Berkeley 标准Socket 库完成，不依赖于具体的平台，具有良好的可移植性。
英文摘要：The real-time video streams technology is used widely in such aspects as videophone, distance education and video on demand.
The network real-time video systemis generally divided into 4 bigmodules: capturing subsystem, compressed coding subsystem, transmission
and controlling subsystem and output subsystem. Among them transmission and controlling subsystem is the key technology of
real-time video streams. How to built transmission and controlling subsystem is proposed based on RTP/RTCP agreement, and UDP
socket is utilized to realize the communication between transport layers. Standard C++ and berkeley standard socket storehouse are used
to finish the encapsulation of RTP/RTCP agreement and UDP socket. This subsystem does not depend on the concrete platform so it has
good portability.基金项目：国家973 重点基础研究发展规划基金项目（G199803040803
