Install on ReadyNAS OS6

full-ffmpeg.sh

# Add multimedia source
echo "deb http://www.deb-multimedia.org wheezy main non-free" >> /etc/apt/sources.list
echo "deb-src http://www.deb-multimedia.org wheezy main non-free" >> /etc/apt/sources.list
apt-get update
apt-get install deb-multimedia-keyring # if this aborts, try again
apt-get update

# Go to local source directory
cd /usr/local/src

# Find the version number of libswscale2 provided by the deb-multimedia repository, this is required to install x264
apt-cache policy libswscale2

# Switch to the version of libswscale2 from deb-multimedia
apt-get install libswscale2=8:1.0.10-dmo1

# Install all dependencies we'll need
apt-get install \
  -y                  \
  libfaad-dev         \
  faad                \
  faac                \
  libfaac0            \
  libfaac-dev         \
  libmp3lame-dev      \
  x264                \
  libx264-dev         \
  libxvidcore-dev     \
  build-essential     \
  checkinstall
 
# Install all build dependencies for ffmpeg
apt-get build-dep ffmpeg
 
# Get the actual ffmpeg source code
apt-get source ffmpeg
 
# Go into the ffmpeg source directory
cd ffmpeg-*
 
# Configure it
./configure \
--enable-gpl \
--enable-nonfree \
--enable-libfaac \
--enable-libgsm \
--enable-libmp3lame \
--enable-libtheora \
--enable-libvorbis \
--enable-libx264 \
--enable-libxvid \
--enable-zlib \
--enable-postproc \
--enable-swscale \
--enable-pthreads \
--enable-x11grab \
--enable-libdc1394 \
--enable-version3 \
--enable-libopencore-amrnb \
--enable-libopencore-amrwb
 
# a fix
mkdir -p /usr/local/share/ffmpeg 
 
# Generate the debian package (*.deb)
checkinstall -D --install=no --pkgname=ffmpeg-full --autodoinst=yes -y

# install the package :)
dpkg -i ffmpeg-full_*-1_amd64.deb

How do I update ffmpeg after following this in order to get it installed?