sip里的rtcp操作
https://wenku.baidu.com/view/854dd3e55ef7ba0d4a733bed.html
rtpstreamdepay Depayloads RTP/RTCP packets for streaming protocols according to RFC4571 rtp gst-plugins-good
rtpstreampay Payloads RTP/RTCP packets for streaming protocols according to RFC4571 rtp gst-plugins-good
rdtmanager Accepts raw RTP and RTCP packets and sends them forward realmedia gst-plugins-ugly
rtpdec Accepts raw RTP and RTCP packets and sends them forward rtsp gst-plugins-good
srtpdec A SRTP and SRTCP decoder srtp gst-plugins-bad
srtpenc A SRTP and SRTCP encoder srtp gst-plugins-bad
rdtmanager Accepts raw RTP and RTCP packets and sends them forward realmedia gst-plugins-ugly
原文：https://www.cnblogs.com/dong1/p/10300092.html