**RTP Control Protocol** (RTCP) is a helper protocol for *Real-time Transport Protocol* (RTP).
The Real-time Transport Protocol (RTP) defines a standardized packet format for delivering audio and video over IP networks.
Rtp does not address resource reservation and does not guarantee quality-of-service for real-time services;the data transport is augmented by a control protocol rtcp to allow monitoring of the data delivery in a manner scalable to large multicast networks and to provide minimal control and identification functionality
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The strange thing is that when streaming is done via rtsp unicast rtcp generates both sender reports and receiver reports but when streaming is done via rtp multicast only sender reports are generated
No receiver reports generated on RTP multicast via vlc