Real-Time Streaming Protocol
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RTSP is the "Real Time Streaming Protocol" developed by the IETF and published as RFC 2326. RTSP is a protocol for use in streaming media systems which allows a client to remotely control a streaming media server, issuing VCR-like commands such as "play" and "pause", and allowing time-based access to files on a server.
RTSP servers typically use RTP as the protocol for the actual audio/video data.
For more information about RTSP, see rtsp.org