title: How to filter by duration at YouTube search API
body: <p>I'm trying to filter my search results by the duration (short) parameter. However, it still returns videos as long as one hour. Also, the <code>orderby</code> parameter doesn't seem to work. Here's the code (all other filters work):</p>
  
  <pre><code>var request = gapi.client.youtube.search.list({
    part: 'snippet',
    q: 'kittens',
    maxResults: 5,
    duration: 'short',
    orderby: 'published',
  });
  </code></pre>
  
  <p>Does it have something to do with the fact that these are "custom search parameters"? If so, how do I use them?</p>