title: Convert isom to mp42
body: <p>How do I convert a video from ISOM to MP42?
  Using FFMPEG in particular? There is no such an option to specify that.</p>
  <pre><code>General
  Complete name                            : C:\wamp\www\tree.mp4
  Format                                   : MPEG-4
  Format profile                           : Base Media
  Codec ID                                 : isom
  File size                                : 763 KiB
  Duration                                 : 3s 834ms
  Overall bit rate                         : 1 630 Kbps
  Writing application                      : Lavf56.30.100
  </code></pre>