calling external program via QtScript

[Be]

I'm looking to write a service extension with QtScipt for SoundCloud. It
looks like most of the hard work has already been done by the Python
program youtube-dl (https://rg3.github.io/youtube-dl/ ). Is there a way
to call external programs via QtScript? I understand there is no way to
do this in JavaScript in browsers for security reasons, but I am hoping
QtScript is different.