I try to install ffmpeg in Ubuntu
according to https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu
I create a shell file with below code

sudo apt-get update

sudo apt-get -y install autoconf automake build-essential libass-dev libfreetype6-dev libgpac-dev 

  libsdl1.2-dev libtheora-dev libtool libva-dev libvdpau-dev libvorbis-dev libx11-dev 

  libxext-dev libxfixes-dev pkg-config texi2html zlib1g-dev

mkdir ~/ffmpeg_sources



cd ~/ffmpeg_sources

wget http://download.videolan.org/pub/x264/snapshots/last_x264.tar.bz2

tar xjvf last_x264.tar.bz2

cd x264-snapshot*

PATH="$PATH:$HOME/bin" ./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" --enable-static --disable-opencl

PATH="$PATH:$HOME/bin" make

make install

make distclean



sudo apt-get install unzip

cd ~/ffmpeg_sources

wget -O fdk-aac.zip https://github.com/mstorsjo/fdk-aac/zipball/master

unzip fdk-aac.zip

cd mstorsjo-fdk-aac*

autoreconf -fiv

./configure --prefix="$HOME/ffmpeg_build" --disable-shared

make

make install

make distclean





cd ~/ffmpeg_sources

wget http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2

tar xjvf ffmpeg-snapshot.tar.bz2

cd ffmpeg

PATH="$PATH:$HOME/bin" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure 

  --prefix="$HOME/ffmpeg_build" 

  --extra-cflags="-I$HOME/ffmpeg_build/include" 

  --extra-ldflags="-L$HOME/ffmpeg_build/lib" 

  --bindir="$HOME/bin" 

  --enable-libfdk-aac 

  --enable-libx264 

PATH="$PATH:$HOME/bin" make

make install

make distclean

hash -r

(I add execution permission to this file ) and in command line run ./mybashfile.sh)

it run correctly and start to download but some last line of terminal output is

.

.

.

rm -f libMpegTPEnc/src/.dirstamp

rm -f libPCMutils/src/.deps/.dirstamp

rm -f libPCMutils/src/.dirstamp

rm -f libSBRdec/src/.deps/.dirstamp

rm -f libSBRdec/src/.dirstamp

rm -f libSBRenc/src/.deps/.dirstamp

rm -f libSBRenc/src/.dirstamp

rm -f libSYS/src/.deps/.dirstamp

rm -f libSYS/src/.dirstamp

rm -f libtool config.lt

rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags

rm -f cscope.out cscope.in.out cscope.po.out cscope.files

rm -f config.status config.cache config.log configure.lineno config.status.lineno

rm -rf ./.deps libAACdec/src/.deps libAACenc/src/.deps libFDK/src/.deps libMpegTPDec/src/.deps libMpegTPEnc/src/.deps libPCMutils/src/.deps libSBRdec/src/.deps libSBRenc/src/.deps libSYS/src/.deps

rm -f Makefile

--2014-09-07 15:18:35--  http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2

Resolving ffmpeg.org (ffmpeg.org)... 192.190.173.45

Connecting to ffmpeg.org (ffmpeg.org)|192.190.173.45|:80... connected.

HTTP request sent, awaiting response... 200 OK

Length: unspecified [text/html]

Saving to: ‘ffmpeg-snapshot.tar.bz2’



    [ <=>                                   ] 13          --.-K/s   in 0s      



2014-09-07 15:18:45 (1.30 MB/s) - ‘ffmpeg-snapshot.tar.bz2’ saved [13]



bzip2: (stdin) is not a bzip2 file.

tar: Child returned status 2

tar: Error is not recoverable: exiting now

./install-ffmpeg.sh: line 31: cd: ffmpeg: No such file or directory

./install-ffmpeg.sh: line 32: ./configure: No such file or directory

make: *** No rule to make target `install'.  Stop.

make: *** No rule to make target `distclean'.  Stop.

where is the Problem? and how Can I install ffmpeg correctly?