title: playing video while encoding with ffmpeg
body: <p>in my Webapplication the user should be able to upload his own videos (either format).
  I am using ffmpeg to encode the video to .mp4 and .flv using the command:</p>
  
  <p>ffmpeg -i uservid.whatever output.mp4 output.flv</p>
  
  <p>while ffmpeg encodes the video, it's loaded in the flowplayer on the users-page. But flowplayer always says "file not found" cause ffmpeg is not yet finish with encoding.</p>
  
  <p>Is there a possibility to load the video in a certain player even if it is not yet completly encoded? maybe there is a ffmpeg option?</p>
  
  <p>Thanks</p>