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• mp3enc : write full LAME frame

  12 avril 2014, par Anton Khirnov

  mp3enc : write full LAME frame
  Most importantly, it contains the encoder delay and replaygain info.
  

  • [DBH] doc/muxers.texi
  • [DBH] libavformat/mp3enc.c

• Creating a movie from multiple .png files

  21 octobre 2014, par QuantumFool

  I’ve got quite a few .png files, and I need to create a movie out of them. So, I’m going through this tutorial which uses ffmpeg :

  http://www.miscdebris.net/blog/2008/04/28/create-a-movie-file-from-single-image-files-png-jpegs/

  When I go to type the first line (sudo apt-get install ffmpeg), in Terminal and enter my password as appropriate, I get :

  Reading package lists... Done
  
  Building dependency tree       
  
  Reading state information... Done
  
  Package ffmpeg is not available, but is referred to by another package.
  
  This may mean that the package is missing, has been obsoleted, or
  
  is only available from another source
  
  
  
  E: Package 'ffmpeg' has no installation candidate

  That’s funny ; I installed the latest version manually this morning ! Anyway, I proceed with the instructions assuming ffmpeg is installed properly (I’m looking at the file where it downloaded to, so that can’t be the issue) :

  cd Downloads
  
  cd python-meep
  
  cd Images
  
  ffmpeg -qscale 4 -r 20 -b 9600 -i Image%03d.png movie.mp4

  To my surprise, I get :

  ffmpeg: command not found

  I just installed it ! Furthermore, I dragged my manual installation folder into the very same directory with the pictures ! What’s going on ?

  Thanks !

• 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 ?