<!-- QuickTime video, and all MP4 formats, are based on it -->
    <acronym>QTFF</acronym>
    <_comment>QuickTime container format</_comment>
  </mime-type>
  <mime-type type="application/mp4">
    <!-- Arbitrary data stored in a MP4 container -->
    <_comment>MP4 container format</_comment>
    <glob pattern="*.mp4s"/>
    <sub-class-of type="application/quicktime" />
  </mime-type>