title: FFmpeg how to get an image for a particular 'coded_picture_number' together with motion vectors
body: <p>I am looking for ways to get this output from ffmpeg:</p>
  
  <p><a href="https://i.stack.imgur.com/0cTDy.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0cTDy.jpg" alt="enter image description here"></a></p>
  
  <p>Basically, I would like to pass to the shell, a command that allows me to output a particular frame number, let's say <code>coded_picture_number=200</code> with the motion vectors drawn into it.</p>
  
  <p>Any clue? Thanks in advance.</p>