title: Edit MP4 Metadata with exiftool
body: <p>I have an MP4 file with <code>Title</code> metadata:</p>
  
  <pre><code>exiftool movie.mp4
  </code></pre>
  
  <p>Which gives:</p>
  
  <pre><code>Audio Bits Per Sample           : 16
  Audio Sample Rate               : 48000
  Handler Type                    : Metadata
  Handler Vendor ID               : Apple
  Title                           : Movie Title
  </code></pre>
  
  <p>I want to completely remove this <code>Title</code> metadata. I have tried overwriting the title:</p>
  
  <pre><code>exiftool -Title="" movie.mp4
  exiftool -Title= movie.mp4
  exiftool -Title="" -overwrite_original movie.mp4
  </code></pre>
  
  <p>The command takes awhile to execute, but exits with:</p>
  
  <pre><code>0 image files updated
  1 image files unchanged
  </code></pre>
  
  <p>What am I doing incorrectly? How can I view what the <code>exiftool</code> error is? How can I remove the <code>Title</code> attribute? According to <a href="https://linux.die.net/man/1/exiftool" rel="noreferrer">the man page</a>, MP4 seems to be a supported file type.</p>
  
  <p>Thanks so much for your help!</p>