基于标准的RTSP协议被用于信令所使用的播放器（和服务器）。
The standards based RTSP protocol is used by the player (and server) for signalling.
RTSP协议覆盖信令等领域，比如请求所需的电影编解码器的细节，通道数目，源服务器的IP地址和端口发送流。
RTSP protocol covers signalling areas such as requesting the details of the movie codecs required, number of tracks, source IP addresses and ports of the server sending the stream.
本文首先简单介绍了VOD视频点播的原理，然后给出了一种具体的服务器的设计方案，其中详细分析了系统控制、信令功能及播放控制部分。
This paper first briefly introduces VOD's principle and application, then presents a design of VOD server software, and particularly analyzes the system control, signaling and play control.
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