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• Export sprites/images from movie

  7 octobre 2014, par Dr.Kameleon

  OK, here’s the situation :

  • I have a .mov video, recorded using QuickTime
  • I want to split it into images (which I will use in a js animation)

  ---

  JS Code :

  function pad(num, size) {
  
      var s = num+"";
  
      while (s.length < size) s = "0" + s;
  
      return s;
  
  }
  
  
  
  
  
  $(function(){
  
      var currentIndex = 1;
  
  
  
  
  
      setInterval(function(){
  
         $("#theImage").attr("src","img/video"+pad(currentIndex,3)+".png");
  
         currentIndex++;
  
      }, 1000/24);
  
  
  
  });

  ---

  So, I tried with FFMpeg :

  ffmpeg -i "video.mov" -f image2 -vf fps=24 video%03d.jpg

  This works. But the quality of the sprites is very low.

  ffmpeg -i "video.mov" -f image2 -vf fps=24 video%03d.png

  This works too. But the quality/size of the sprite is HUGE. I mean every sprite is around 110KB, with a grand total far above the video’s size (100MB > 2MB !)

  What’s going on ?

  How can I achieve that, without losing any quality and still not having too deal with huge filesizes ?

• How can I use Windows absolute paths with the movie filter on FFmpeg ?

  26 février 2024, par Mason

  I want to do something like -filter_complex "movie=C:\\User\\...\\file" but I can't because of the : in the Windows path. I tried escaping it with a \ but no luck. I've figured out how to get around it by making everything else an aboslute path and running the command in the same directory as the file I need for the movie filter, but the only reason that works is because I only have a single movie filter. I'm hoping there's a better way.

  


• How to append 2 seconds of silence to an existing movie MP4 with ffmpeg ?

  27 février 2020, par Marie

  I would like to append 2 seconds of silence to an existing video using ffmpeg.
  I would like to keep the last frame displayed while the 2 seconds of video playsback not a black screen.

  Thank you.