title: Using ffmpeg to create looping apng
body: <p>I'm trying to create looping apng files from mkvs. My problem is that they don't loop. The files play once, but stop.</p>
  
  <p>This is what I'm doing:</p>
  
  <pre><code> ffmpeg -ss 16:43 -i ./10.mkv -loop 10 -t 1 -filter:v "setpts=PTS-STARTPTS, crop=1200:800, hqdn3d=1.5:1.5:6:6, scale=600:400"  10-file-2.apng
  </code></pre>
  
  <p>I've tried -loop -1 -loop 10 -loop 1 but there is no looping done. My version is </p>
  
  <blockquote>
    <p>ffmpeg-3.3.el_capitan.bottle.tar.gz</p>
  </blockquote>