title: Add different filter parameters to multiple images
body: <p>I have this command to generate a slideshow with zoompan from a list of images, but it applies the same zoompan to all pictures.</p>
  
  <pre><code>ffmpeg -r 1/5 -i img%03d.jpg -i 1.mp3 -c:a aac -c:v libx264 -r 25 -pix_fmt yuv420p -vf "zoompan=z='if(lte(zoom,1.0),1.2,max(1.001,zoom-0.0015))':d=100" out.mp4
  </code></pre>
  
  <p>How can I get it to have different zoompan parameters for each image?</p>