sudo apt-get install libfaac-dev
git clone git://git.videolan.org/ffmpeg.git
cd ffmpeg
./configure --enable-nonfree --enable-libfaac
make
./ffmpeg \
-i input.mkv \
-vcodec copy \
-acodec libfaac \
-ab 192k \
-ac 2 \
-threads 4 \
-strict experimental \
output.mp4
Serve to Xbox with FUPPES
Adapted from: http://www.bizzeh.com/683/fast-convert-x264-mkv-xbox360-mp4-play-mkv-xbox-360