Setting up Remix: en-ffmpeg not found

If you type en-ffmpeg from your terminal do you see its usage string?

If so, what happens when you try this:

# python
>>> import os
>>> os.system("en-ffmpeg")

There's nothing special about the way Remix calls ffmpeg, it just system shells via Popen. That error indicates that when it tried to do that it received "command not found" (it actually looks for this string)