TiMeBaNDiT76

It seems, that ffmpeg -v doesn't get the version. You have to use ffmpeg -version instead.

I removed the installation check from the script but in the end, the call of ffprobe doesn't work on my machine. I got no result from the "-show-streams" call, just...

Yes, if you install ffmpeg on OSX, ffmpeg -version would be the command to get the version (instead of ffmpeg -v, which you used)