说明：  实时传输协议（Real- time Transport Protocol，PRT）是在Internet 上处理多媒体数据流的一 种网络协议，利用它能够在一对一（unicast，单播）或者一对多 （multicast，多播）的网 络环境中实现传流媒体数据的实时传输。RTP
(Real-time Transport Protocol (Real-time Transport Protocol, PRT) in handling multimedia data streams on the Internet is a network protocol, it can use one (unicast, unicast) or many (multicast, multicast) of network environment to achieve real-time data transfer streaming media transmission. RTP)