ok, i have a clue:
i have just tried mediaproxy on a debian and it works!
so, these are my questions:
since python works (i tried it with test.py) and since i did everything i have to do is it possible that mediaproxy as a problem with no-debian distros? or with gentoo?
and then,
what can i do to solve my problem?

> $  /etc/init.d/mediaproxy start
> : bad interpreter: No such file or directory
> and:
> $ /usr/local/mediaproxy/mediaproxy.py
> : No such file or directory


thakn you!