Real Time Streaming Protocol definition

Real Time Streaming Protocol

(also RTSP)

Real Time Streaming Protocol (RTSP) is a network protocol used to control streaming media servers. It allows a client to play, pause, rewind, fast forward, or stop the stream, much like a remote control works with a VCR.

How Real Time Streaming Protocol works

RTSP operates on a client-server model. The client (like a media player) sends control requests, and the server (where the media is stored) responds and streams the media. RTSP uses the Real-Time Transport Protocol (RTP) for the actual streaming, while RTSP itself manages the control sequence.

The client initiates a session by sending a SETUP request to the server. This request specifies the media stream to be controlled.
The server responds with session details, such as a session identifier.
The client can then send control commands such as:
PLAY to start the stream
PAUSE to pause it
TEARDOWN to end the session
RECORD (in some applications) to record the stream
Other commands for seeking, fast-forwarding, or rewinding within the media stream
Upon receiving a control command, the server responds accordingly. For a PLAY command, for example, the server starts streaming media to the client using RTP.
Throughout the session, the client and server maintain communication. The server sends media data as per client requests, and the client may send further control commands as needed.
When the media playback is complete or the user ends it, the client sends a TEARDOWN command to close the session.

Uses of Real Time Streaming Protocol

Streaming applications. RTSP is used for live video and audio streaming in applications like video conferencing and live broadcasts.
Media player control. Media players and clients used it for controlling playback with actions such as play, pause, and seek.
Surveillance systems. Security systems use RTSP for live streaming from cameras and other surveillance equipment.