Once you open VLC Media player, Click Media in the menu at the top, then click "Open Network Stream..." VLC will open a box that asks for the network stream URL.

For both the RC8221 (indoor) and the OC821D (Outdoor), I use rtsp://IPADDRESS:554/img/media.sav?channel=2

There is quite a bit of information in the threads above about the different streams that are available, as well as the commands to modify the settings of the streams.