title: issue with ffmpeg config
body: <p>a ffmpeg was installed in my server but it no support some liberary like libvpx
  (centos 6.5)
  I couldn't uninstall it but I install I new one with this tutorial:
  <a href="http://wiki.razuna.com/display/ecp/FFMpeg+Installation+on+CentOS+and+RedHat#FFMpegInstallationonCentOSandRedHat-InstallLibvpx" rel="nofollow noreferrer">http://wiki.razuna.com/display/ecp/FFMpeg+Installation+on+CentOS+and+RedHat#FFMpegInstallationonCentOSandRedHat-InstallLibvpx</a></p>
  
  <p>(all configs in ffmpeg seems install correctly)</p>
  
  <pre><code>PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig"
  export PKG_CONFIG_PATH
  ./configure --prefix="$HOME/ffmpeg_build" --extra-cflags="-I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib" --bindir="$HOME/bin" \ 
  --extra-libs=-ldl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvpx --enable-libfaac \
  --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libvo-aacenc --enable-libxvid --disable-ffplay \
  --enable-gpl --enable-postproc --enable-nonfree --enable-avfilter --enable-pthreads 
  </code></pre>
  
  <p>So I want to  test it:</p>
  
  <p>I try test it with:</p>
  
  <pre><code> #ffmpeg
  </code></pre>
  
  <p>result:</p>
  
  <p><img src="https://i.stack.imgur.com/qCRbi.jpg" alt="enter image description here"></p>
  
  <p>It seems related with older ffmpeg that was install.
  no change and no lib add!</p>