This assumes Ubuntu 10.04 (Lucid Lynx). The output video should play on most
Windows.
sudo apt-get install \
libmp3lame-dev \
libopencore-amrnb0 \
libopencore-amrwb-dev \
libxvidcore-dev
svn checkout svn://svn.ffmpeg.org/ffmpeg/trunk ffmpeg
cd ffmpeg
./configure \
--enable-gpl \
--enable-libmp3lame \
--enable-libopencore-amrnb \
--enable-libopencore-amrwb \
--enable-libxvid \
--enable-version3
./ffmpeg \
-i input.3gp \
-f avi \
-acodec libmp3lame \
-vcodec msmpeg4v2 \
output.avi