build tool 
- mingsw : mingw-get-inst-20120426
- http://www.mingw.org/

FFmpeg 
- version 1.0.0(09/28/2012, Stable)
- http://www.ffmpeg.org

exteral library
* SDL : The SDL(Simple DirectMedia Layer)  module is licensed under the LGPL.
 - version 1.2.15
 - http://www.libsdl.org/

* libfaac : The libfaac AAC encoder module is licensed under the LGPL.
 - version 1.28
 - http://www.audiocoding.com


* lame : The lame MP3 encoder module is licensed under the LGPL. 
 - vertion 3.99.5
 - http://lame.sourceforge.net


* How to build
1. install mingw
2. build and install SDL
3. excute mingw
4. move {working directory}\ffmpeg
5. _build.bat
6. output file : {working directory}\output
 




