title: How to batch process a directory of mp4 files to remove their metadata?
body: <p>I convert one mp4 file using ffmpeg to remove all metadata from the mp4 file  with the following command:</p>
  <pre><code>ffmpeg -i test.mp4 -map_metadata -1 -c:v copy -c:a copy out.mp4
  </code></pre>
  <p>This works fine but I want a bash script that will automatically remove all metadata of a directory containing mp4 files, with minimum interaction.</p>
  <p>How can I do that?</p>