ffmpeg install (include x264) , you should non-free

ffmpeg_install.sh

#!/bin/bash

# ref: http://takuya-1st.hatenablog.jp/entry/20120225/1330184067

##uninstall
sudo apt-get remove ffmpeg x264 libx264-dev -y
## install build-tools and library
sudo apt-get update
sudo apt-get install -y build-essential checkinstall git libfaac-dev libjack-jackd2-dev \
  libmp3lame-dev libopencore-amrnb-dev libopencore-amrwb-dev libsdl1.2-dev libtheora-dev \
  libva-dev libvdpau-dev libvorbis-dev libx11-dev libxfixes-dev texi2html yasm zlib1g-dev
#install x264
cd
git clone git://git.videolan.org/x264
cd x264
./configure --enable-static
make
sudo checkinstall --pkgname=x264 --pkgversion="3:$(./version.sh | \
     awk -F'[" ]' '/POINT/{print $4"+git"$5}')" --backup=no --deldoc=yes \
     --fstrans=no --default
#install ffmpeg
cd
git clone --depth 1 git://source.ffmpeg.org/ffmpeg
cd ffmpeg
./configure --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb \
    --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 \
    --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab
make
sudo checkinstall --pkgname=ffmpeg --pkgversion="5:$(date +%Y%m%d%H%M)-git" --backup=no \
  --deldoc=yes --fstrans=no --default
hash x264 ffmpeg ffplay ffprobe