说明：  介绍了RTP实时传输协议以及RTCP实时传输控制协议的概念，使得读者对于RTP和RTCP有个更加深入的了解！
(Introduce a real-time transport protocol RTP and RTCP Real-time Transport Control Protocol of the concept, making the reader for the RTP and RTCP have a more in-depth understanding!)