title: ffmpeg interpolate a loop to be smooth
body: <p>I am using ffmpeg to create looping video, where looping is totally smooth, same as moving between all frames.
  I have 27 images, which one transforms in another, so frame 0 = frame 27
  I use -vf minterpolate=fps=30 between images, so transition is very smooth. I have -framerate 10, so in theory interpolation filter creates 3 additional frames. So I remove 27'th frame and creating a video</p>
  
  <p>ffmpeg -framerate 10 -start_number 0 -i ./motion/%d.png -vf "minterpolate=fps=30"</p>
  
  <p>But when it looping, there no transition between 0 and last frame, and it is not smooth. How to create a smooth transition between loops? I tried to leave 27'th frame and when gluing video, delete last frame, which is repeating. but don't know how to cut only one frame, by time it failed.</p>
  
  <p>Please help me get smooth loop with minterpolate filter. </p>