ffmpeg-windows-build-helpers

Cross-compiling from a Linux environment:

Install minigw-w64

   $ sudo apt-get install mingw-w64

Clone this repo
Run ./cross_compile_ffmpeg.sh -h to see what are the available options
Invoke the cross compilation script as root ! (invocation example)

   $  sudo ./cross_compile_ffmpeg.sh --build-ffmpeg-static=n --build-ffmpeg-shared=y --gcc-cpu-count=4 --compiler-flavors=win64