title: .flv and .f4v file extensions displaying unexpected mime type
body: <p>When I look up the mime types of my <code>.flv</code> and <code>f4v</code> in <code>php</code> it states them as: application/octet-stream. </p>
  
  <p>I always thought the mime types for these files were 'video/x-flv' and 'video/x-f4v'. Is this a new thing or are the files coming from a funky source or something?</p>