title: Install ffmpeg in to virtual environment
body: <p>I am trying to install <code>ffmpeg</code> in order to use it on OpenAI to record videos. I have installed it using <code>brew install ffmpeg</code> but somehow when I compile my code I get the same error, it is like the package is not recognized by my <code>virtualenv</code> where I am working.</p>
  
  <p>Error on Python console:</p>
  
  <pre><code>raise error.DependencyNotInstalled("""Found neither the ffmpeg nor avconv executables. On OS X, you can install ffmpeg via `brew install ffmpeg`. On most Ubuntu variants, `sudo apt-get install ffmpeg` should do it. On Ubuntu 14.04, however, you'll need to install avconv with `sudo apt-get install libav-tools`.""")
  </code></pre>
  
  <p>However, when I execute which <code>ffmpeg</code> I got the following path <code>/usr/local/bin/ffmpeg</code>.</p>
  
  <p>It seems like that <strong>Anaconda</strong> for example needs a specific command to install this package into its environment, it is the same for <strong>virtualenv</strong>?</p>
  
  <p>Thanks in advance.</p>