title: Fade out is not executed at the right time
body: <p>I have</p>
  
  <pre><code>-y -ss 00:03:23.382 -i "G:\video.MP4" -t 00:00:18.321 -af "afade=t=in:ss=0:d=2,afade=t=out:st=00:00:16.321:d=2" -c:v libx264 3.mp4
  </code></pre>
  
  <p>yet the fade out is not executed. From where does <code>st</code> in <code>out</code> count here?</p>