how to play RTSP video in OSX
VLC works for me but it only supports a single video stream. QuickTime Player 10 does not support even a single RTSP stream as far as I can tell. QuickTime Player 7 worked for me up until a few days ago when I upgraded my system. I resorted to making a copy of VLC:

cd /Applications
cp -pr VLC.app/ VLC2.app


Then opening the VLC2 app and using it to open another RTSP stream.