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• Split a movie so that each GIF is under a certain file size

  9 novembre 2014, par Terence Eden

  Problem

  I want to convert a long movie into a series on animated GIFs.

  Each GIF needs to be <5MB.

  Is there any way to determine how large a GIF will be while it is being encoded ?

  Progress So Far

  I can split the movie into individual frames :

  ffmpeg -i movie.ogv -r 25 frameTemp.%05d.gif

  I can then use convert from ImageMagick to create GIFs. However, I can’t find a way to determine the likely file size before running the command.

  Alternatively, I can split the movie into chunks :

  ffmpeg -i movie.ogv -vcodec copy -ss 00:00:00 -t 00:20:00 output1.ogv

  But I’ve no way of knowing if, when I convert the file to a GIF it will be under 5MB.

  A 10 second scene with a lot of action may be over 5MB (bad !) and a static scene could be under 5MB (not a problem, but not very efficient).

  Ideas

  I think that what I want to do is convert the entire movie into a GIF, then find a way to split it by file size.

  Looking at ImageMagick, I can split a GIF into frames, but I don’t see a way to split it into animated GIFs of a certain size / length.

  So, is this possible ?

• Processing 3, video lib : could not load movie file Ubuntu

  19 novembre 2017, par Konstantin Pashennykh

  Don’t sample code video lib processing 3.3.6 on Ubuntu 16.04. File in both folder - with sketch and data folder. Previous Install gstreamer 0.10-ffmpeg (solved previous problem with not run lib) Any your idea ?
  P.S. Work on Windows 7

  import processing.video.*;
  
  
  
  Movie mov;
  
  
  
  void setup() {
  
    size(640, 360);
  
    background(0);
  
    mov = new Movie(this, "transit.mov");
  
    mov.loop();
  
  }
  
  
  
  void movieEvent(Movie movie) {
  
    mov.read();  
  
  }
  
  
  
  void draw() {    
  
    image(mov, 0, 0);
  
  
  
    float newSpeed = map(mouseX, 0, width, 0.1, 2);
  
    mov.speed(newSpeed);
  
  
  
    fill(255);
  
    text(nfc(newSpeed, 2) + "X", 10, 30); 
  
  }

  Best Regards,
  Kos

• Creating a movie with Bullet Physics

  27 novembre 2012, par Sara

  I am trying to make a movie from my bullet demo. To do that, I want to store an image every timestep, and create a movie using ffmpeg.

  I need the simulation to advance only one step at a time. For that, I am doing

  m_dynamicsWorld->stepSimulation(0.005,0);

  And after that, I store the scenario (I later create an image of the scenario). At the end of the animation, I am creating a movie using as timestep 200 fps (1/0.005). This should give me the real time animation, but instead the animation is a little bit slow.

  Any ideas ?