title: Video content type is invalid in paperclip-ffmpeg
body: <p>When I try to upload .mov video in paperclip-ffmpeg it gives an error</p>
  
  <blockquote>
    <p>Video content type is invalid in paperclip-ffmpeg</p>
  </blockquote>
  
  <p>My code is </p>
  
  <pre><code>has_attached_file :video, :styles =&gt; { 
  :medium =&gt; { :geometry =&gt; "640x480", :format =&gt; 'webm' }
  }, :processors =&gt; [:ffmpeg]
  validates_attachment_size :video, :less_than =&gt; 100.megabytes
  validates_attachment_presence :video
  validates_attachment_content_type :video, :content_type =&gt; ["video/mov"]
  </code></pre>