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Index › Programming Questions & Help › Programs › How to export a sketch to AVI
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How to export a sketch to AVI ? (Read 2745 times)
TweakingKnobs
How to export a sketch to AVI ?
Nov 21st, 2008, 10:54pm  
How do i export a sketch to avi raw or even better png's ?

And how to i tell Processing how long the video must be , like 60 frames for example.

There is another thing, i have my sketch running at 60, but i want my avi to run acctually at 25 fps.


thanx !
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« Last Edit: Nov 22nd, 2008, 12:36am by TweakingKnobs »  
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koogy
Re: How to export a sketch to AVI ?
Reply #1 - Nov 22nd, 2008, 6:04pm  
SaveFrame will save the current display as a png

http://processing.org/reference/saveFrame_.html

as for stopping - just increment a counter in your draw loop and exit at the required number of frames.

your sketch won't run at 60fps if it's saving a png every frame.

as for forcing the final avi to 25fps, that's a function of whatever you're using to create the avi from the pngs rather than processing.

(i use mencoder in linux -
http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-enc-images.html - have used this with 15000 frames for a 10 minute animation)
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PhiLho 
Re: How to export a sketch to AVI ?
Reply #2 - Nov 22nd, 2008, 6:05pm  
I used the QuickTime video library to export a movie. The code of the code is:
Code:
void setup()
{
  smooth();
  frameRate(24);

// Some init code here ...

  if (bExportVideo)
  {
    mm = new MovieMaker(this, width, height, "movie.mov", 24,
	  MovieMaker.JPEG, MovieMaker.BEST);
  }
}

void draw()
{
  // Stop on the wanted frame number
  if (frameCount > MAX_FRAME_NB)
  {
    if (bExportVideo)
    {
	mm.finish();
	delay(1000);
    }
    exit();
  }
  DrawBackground();

  // Some drawing code here ...

  if (bExportVideo)
  {
    mm.addFrame();
  }
}

Now, it won't export AVI, I think. I don't know if another library can do that.
You write exporting PNG can do the job, indeed you can post-process them with something like ffmpeg or similar.
You can use saveFrame() (or just save()) for this task.

Framerate: not an issue if you collect a bunch of PNGs, but as shown above, there is a function to control this.
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TweakingKnobs
Re: How to export a sketch to AVI ?
Reply #3 - Nov 23rd, 2008, 2:22pm  
Thanx, i am very new, so i dont know where to put that code in my sketch,

Her's my sketch :
Code:

/*Bouncing ball
*/


//Declare global variables
int xspeed, yspeed;
int xpos,ypos,wdth,ht;

//inicializar sketch

void setup(){
  
  //set sketch window and background color
  
  size(800,300);
  background(#FA005C);
  smooth();
  
  //ball speed
  
  xspeed = 8;
  yspeed = 9;
  
  
  // ball size
  
  
 wdth = 10;
 ht = 10;
 
 noStroke();
 
 //initial ball placement
 
 xpos = width /2;
 ypos = height /2;
 
 frameRate(60);
} 

//begin animation draw

void draw (){
  
  //update background
  
//lbackground (#FA005C);
  
  // draw ball
    ellipse ( xpos,ypos,wdth,ht);
    
    //upgrade ball position
    
    xpos+=xspeed;
    ypos+=yspeed;
    
    /*detects ball collition with sketch window edges also accounts for thickness of the ball
    */
    
    if ( xpos>width-wdth/2 || xpos<=wdth/2){
	 xspeed*=-1;
	 }
	   if (ypos>=height-ht/2 || ypos<=ht/2){
	     yspeed*=-1;
	     }
	     }


Can you tell me where to put the code ?

Thanx !
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PhiLho 
Re: How to export a sketch to AVI ?
Reply #4 - Nov 23rd, 2008, 2:44pm  
Look at linked saveFrame() reference: it is always called at the end of draw() routine.
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TweakingKnobs
Re: How to export a sketch to AVI ?
Reply #5 - Nov 23rd, 2008, 4:04pm  
Thanx, i tried to put the code at the end of my void draw, but i get this error, i puted the new code where its yellow.
Hope you can help me , thanx!

http://www.mediafire.com/imgbnc.php/ee7b414f24a9ae9bd6f276bfa03f6bac6g.jpg
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PhiLho 
Re: How to export a sketch to AVI ?
Reply #6 - Nov 23rd, 2008, 6:39pm  
Well, the code with x is unrelated, it is the animation example of the sample code. Just add saveFrame(). And you can use a .png extension there.
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TweakingKnobs
Re: How to export a sketch to AVI ?
Reply #7 - Nov 23rd, 2008, 9:58pm  
Allright ! I got it , thanx !!!
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