An RTSP stream, short for Real Time Streaming Protocol, is a standard for efficiently streaming audio/visual data to large groups of people. VLC Media Player, a free media player and converter for Mac and PC computers, supports playback of many types of streaming media, including HTTP, MMS and RTSP streams simply by pasting the stream's URL into the proper field.
Click the "File" tab and select "Open Network."
Copy and past the URL of the RTSP stream into the "URL" field at the top of the screen. Click "Open" to load and play your stream in VLC.