So, after doing a lot of digging to find out exactly what parameters you need and why, I decided to make a small script in python that will give you the correct rtmpdump command for all qualities of a stream to start dumping from own3d.tv.
http://pastebin.com/dqpRnp6h
Usage:
$ script.py <streamID>
(streamID is the numeric value from the stream URL. For "http://www.own3d.tv/live/37905/TSM_Dyrus", it's 37905)
If you guys have any problems, let me know the stream url you're having problems with please.