RTSPTest | test GUI that I wrote that implements the RTSP Signalling

What the SETUP command does is that we need to establish a connection to the server so that we can access each "channel" of data (audio and video). As such, we need one SETUP command for audio and one for video. What this may look like for audio and video that’s returned from the server could be:. Note that both of the string chunks are more or less the same. The only difference is the server_port.
The SETUP command looks like the following. Bear in mind that we must issue a command per media track for setting up (i.e. one for video and one for audio). The Transport field is important, as it tells the server what kind of protocol the server should be streaming with (RTP of course), as well as where we will want to receive incoming media data, specified in this part of the string (recall the Port 9000 and 9001 that was mentioned earlier). We usually set the mode to unicast, signifying that the stream will only be broadcast to one device. Multicast options are possible, but the server must support it. What this means is that with one single audio/video stream, it can be replicated to many more devices than just a single one. This is not supported by most RTSP servers, and so unicast is always the safest mode to use.