title: Android app to search mp4 videos by metadata
body: <p>I have a set of mp4 files that I need to load onto an SD Card and read in my Android app.</p>
  
  <p>The app needs to be able to search the videos by category, so my plan was to add some category info in the mp4 metadata before loading them (probably in the "description" field) and then use a <code>ManagedQuery</code> on the <code>MediaStore.Video.Media.EXTERNAL_CONTENT_URI</code> to find them. </p>
  
  <p>I have updated the "description" field using Adobe Bridge, but when I look at the tags returned by a search, the "description" field is always null. Clearly, the data I'm writing to the mp4 files is not being picked up when Android looks at the video file.</p>
  
  <p>Is there another way I should be writing/searching video metadata?</p>