Original project https://github.com/Godot-dcl/ffmpeg-node Updated to Godot release build 4.0.1
git submodule update --init --recursive
cd ffmpeg_build_scripts
./linux.sh
cd ..
scons target=template_debug dev_build=yes
Precompiled ffmpeg libraries (4.4) can be found here:
https://github.com/BtbN/FFmpeg-Builds/wiki/Latest
Download the win64-gpl-shared-4.4
Unpack the package and copy include, lib and bin into [project]/lib/windows/x86_64:
scons target=template_debug dev_build=yes
Copy all dlls from ffmpeg-4-shared/bin to bin/windows:
$ cp ffmpeg-4-shared/bin/*.dll bin/windows/
$ ls bin/windows
avcodec-58.dll* avdevice-58.dll* avfilter-7.dll* avformat-58.dll* avutil-56.dll* libffmpegmediadecoder.64.dll* libffmpegmediadecoder.64.exp libffmpegmediadecoder.64.lib postproc-55.dll* swresample-3.dll* swscale-5.dll*