• MSYS (Install it)
  http://www.mingw.org/download/installer
  Choose at least install options gcc-g++ as below
  
  Then click Installation | Apply Changes
• FFmpeg source code
  https://github.com/FFmpeg/FFmpeg
  

• Visual Studio 2013 Free Community Edition (Install it)
  https://www.visualstudio.com/en-us/news/releasenotes/vs2013-community-vs
  
  
• YASM
  http://yasm.tortall.net/Download.html
  

One time setup

• Rename & copy yasm-1.3.0-win64.exe to C:\MinGW\bin\yasm.exe
• Then rename C:\MinGW\msys\1.0\bin\link.exe to something else (link-removed.exe) so it doesn't obscure MSVC link.exe.
  
  

Compile

This is the tricky part. Otherwise configure might run forever without returning or give errors.
You need to launch cmd.exe first to load msvc env variables with vcvarsall.bat amd64 for 64-bit or  vcvarsall.bat for 32-bit, then from that window launch msys.bat

Launch cmd.exe and type :

cd "c:\Program Files (x86)\Microsoft Visual Studio 12.0\VC"
vcvarsall.bat amd64
C:\MinGW\msys\1.0\msys.bat

A new MinGW prompt will open with unix shell, then type :

$> ./configure --enable-asm --enable-yasm --disable-ffserver --disable-avdevice --disable-doc --disable-ffplay --disable-ffprobe --enable-shared --disable-static --disable-bzlib --disable-libopenjpeg --disable-iconv --disable-zlib --prefix=/c/ffmpeg --toolchain=msvc --arch=amd64 --extra-cflags="-MDd" --extra-ldflags="/NODEFAULTLIB:libcmt" --enable-debug
$> make
$> make install
$> cp ffmpeg_g.* /c/ffmpeg/bin

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