Now I see your problem. Of course you have to use KSV's version. He has done some necessary modifications for this site (and many others).
I get NetStream.Play.Failed for now, too. The only way i found to get around this is using a login. You'll find they details here in the thread:
here
RTMPDumpHelper does something a bit more tricky. It hooks between your flashplayer and the server to record everything it receives (simply said). So you won't be able to close the tabs without losing connection.