title: FFmpeg output to MacOSX screen?
body: <p>How do I route ffmpeg output to the screen on MacOSX?</p>
  
  <p>If I type: </p>
  
  <pre><code>ffmpeg -i input.mp4 -i logo.png -filter_complex overlay  output.mp4
  </code></pre>
  
  <p>The output file contains the input file with the logo overlayed on top of it.</p>
  
  <p>If I type:</p>
  
  <pre><code>ffplay -i input.mp4 -i logo.png -filter_complex overlay  
  </code></pre>
  
  <p>Then it throws the error:</p>
  
  <pre><code>Argument 'logo.png' provided as input filename, but 'input.mp4' was already specified.
  </code></pre>
  
  <p>...but typing:</p>
  
  <pre><code>ffplay -filters
  </code></pre>
  
  <p>displays a list of filters including:</p>
  
  <pre><code> T.C overlay          VV-&gt;V      Overlay a video source on top of the input.
  </code></pre>
  
  <p>Clearly, I'm missing something obvious.  </p>
  
  <p>How do I route ffmpeg output to the screen, and where can I find a list of which filters and options work in ffmpeg but not in ffplay?</p>