[LAU] screencasting with xephyr - wiki page

[Renato]

Hi, I'm trying to follow the wiki screencasting guide:

http://apps.linuxaudio.org/wiki/screencasttutorial

however I don't get how Xephyr should work. I just get a big black
window. That's probably because I just removed the "/etc/X11/Xession"
line, but I don't have that file (I'm on Archlinux). I tried
substituting it with "xinit" (how I normally start X) but that didn't
work too.

how is it supposed to work?

cheers,
renato