build ffmpeg for win32

how to build ffmpeg ?

1. winxp/win7 msys2 environment
   download and install msys2

2. install required packages

pacman -S git
pacman -S make
pacman -S mingw-w64-i686-gcc
pacman -S mingw-w64-i686-yasm
pacman -S mingw-w64-i686-nasm
pacman -S mingw-w64-i686-pkg-config
pacman -S mingw-w64-i686-diffutils

3. execute build_ffmpeg_for_win32.sh script
   (you can find it in ffplayer project source code.)

./build_ffmpeg_for_win32.sh

can't find xxxxx.dll ?

they are under the msys2 directory. find them and release them with ffmpeg dlls and your apps.