title: matplotlib animation ArtistAnimation failure due to ffmpeg unavailable
body: <p>I am trying to call matplotlib.animation.ArtistAnimation to make an animation from a series of png images, but I get an error that is connected to the ffmpeg. I have Anaconda installed on my Ubuntu 14.04. The error message that I get is:</p>
  
  <pre><code>UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.
    warnings.warn('Matplotlib is building the font cache using fc-list. This may take a moment.')
  /home/ohm/anaconda2/lib/python2.7/site-packages/matplotlib/animation.py:782: UserWarning: MovieWriter ffmpeg unavailable
    warnings.warn("MovieWriter %s unavailable" % writer)
  ...
    File "/home/ohm/anaconda2/lib/python2.7/site-packages/matplotlib/animation.py", line 810, in save
      writer.grab_frame(**savefig_kwargs)
    File "/home/ohm/anaconda2/lib/python2.7/contextlib.py", line 24, in __exit__
      self.gen.next()
    File "/home/ohm/anaconda2/lib/python2.7/site-packages/matplotlib/animation.py", line 196, in saving
      self.finish()
    File "/home/ohm/anaconda2/lib/python2.7/site-packages/matplotlib/animation.py", line 389, in finish
      + ' Try running with --verbose-debug')
  RuntimeError: Error creating movie, return code: 1 Try running with --verbose-debug
  </code></pre>
  
  <p>I've tried <code>sudo apt-get install ffmpeg</code>, but there is no such package. Someone knows what package I'm missing?</p>