(e.g., /bin suggests a directory in a Unix-like system).
At first glance, it looks like a typo. Is it a variable? A binary flag? A placeholder? fgoptionalmpfilesbin better
git clone https://github.com/rdp/ffmpeg-windows-build-helpers.git cd ffmpeg-windows-build-helpers ./cross_compile_ffmpeg.sh fgoptionalmpfilesbin better