Is it possible to run SM 5 from a usb?

I have been told by a fellow player that it is possible to run stepmania 5 through a usb, so i tried it and i got an error, i tried again and still got an error, so i was wondering if it was just a issue with my folder or what? id really like to know if this was possible...

I believe it's to do with FFMPEG. Are you running it on the same PC where you copied the files from?

yes, i tryed the usb copy with my pc and someone elses pc, both had this error