Downloads & builds headless FFMPEG along with all dependencies in parallel, enabling all features

Headless FFMPEG Build Script (Ubuntu)

#!/bin/bash -e

# Distro: Ubuntu 14.04.2 LTS
# Derived from https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu

# Builds the dependencies in parallel prior to starting FFmpeg build.

sudo apt-get update
sudo apt-get -y --force-yes install \
  autoconf automake build-essential libass-dev libfreetype6-dev libgpac-dev \
  libtheora-dev libtool libvorbis-dev pkg-config texi2html zlib1g-dev yasm \
  cmake mercurial unzip libx264-dev libmp3lame-dev libopus-dev libfdk-aac-dev

rm -rf ~/ffmpeg
mkdir -p ~/ffmpeg/sources
mkdir -p ~/ffmpeg/build
mkdir -p ~/bin

pushd ~/ffmpeg/sources

# libx265
{
  hg clone --insecure https://bitbucket.org/multicoreware/x265
  pushd x265/build/linux
  PATH="$HOME/bin:$PATH" cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$HOME/ffmpeg/build" -DENABLE_SHARED:bool=off ../../source
  make
  make install
  make distclean
} &

# libfdk-aac
{
  wget -O fdk-aac.zip https://github.com/mstorsjo/fdk-aac/zipball/master
  unzip fdk-aac.zip
  pushd mstorsjo-fdk-aac*
  autoreconf -fiv
  ./configure --prefix="$HOME/ffmpeg/build" --disable-shared
  make
  make install
  make distclean
} &

# libvpx
{
  wget http://webm.googlecode.com/files/libvpx-v1.3.0.tar.bz2
  tar xjvf libvpx-v1.3.0.tar.bz2
  pushd libvpx-v1.3.0
  PATH="$HOME/bin:$PATH" ./configure --prefix="$HOME/ffmpeg/build" --disable-examples --disable-unit-tests
  PATH="$HOME/bin:$PATH" make
  make install
  make clean
} &

# ffmpeg download & extract
{
  wget http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2
  tar xjvf ffmpeg-snapshot.tar.bz2
} &

# join all dependant jobs before starting ffmpeg
wait

# ffmpeg
pushd ffmpeg
PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg/build/lib/pkgconfig" ./configure \
    --prefix="$HOME/ffmpeg/build" \
    --pkg-config-flags="--static" \
    --extra-cflags="-I$HOME/ffmpeg/build/include" \
    --extra-ldflags="-L$HOME/ffmpeg/build/lib" \
    --bindir="$HOME/bin" \
    --enable-gpl \
    --enable-libass \
    --enable-libfdk-aac \
    --enable-libfreetype \
    --enable-libmp3lame \
    --enable-libopus \
    --enable-libtheora \
    --enable-libvorbis \
    --enable-libvpx \
    --enable-libx264 \
    --enable-libx265 \
    --enable-nonfree
PATH="$HOME/bin:$PATH" make
make install
make distclean
hash -r