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Index › Programming Questions & Help › Other Libraries › GifAnimation memory problems
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GifAnimation memory problems (Read 478 times)
Andre_V._P.
GifAnimation memory problems
Jun 2nd, 2008, 4:49pm  
Hi, I'm trying to make program that loads and displays multiple Gif animations at the same time and I'm having some problems:

1 - Using the GifAnimation library I could only load and run gif animations with file size smaller than 30Kb, if they were bigger, I got this error message:

Exception in thread "Thread-7" java.lang.OutOfMemoryError: Java heap space
   at java.awt.image.DataBufferInt.<init>(DataBufferInt.java:41)
   at java.awt.image.Raster.createPackedRaster(Raster.java:458)
   at java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.
java:1015)
   at java.awt.image.BufferedImage.<init>(BufferedImage.java:345)
   at gifAnimation.GifDecoder.readImage(GifDecoder.java:725)


So I sent an email with the Gif file to Kevin Weiner, who wrote some of the library classes, and answered like this to me:

"I believe the file is just too large for the heap.  Uncompressed, the frames take up 77MB.  (410x410x4x115)

Perhaps you can modify the reader to return frames one at a time through a callback, rather than saving them all in an ArrayList."

I don't know if I got him, but I tried than to load the Gif file frame by frame in an PImage[] array. And called one frame at a time to display in my program.

This actually worked, but not for long, because it only raised the limit of size to 113 frames.

I wrote an email to Patrick Meister who wrote the Processinng GifAnimation library and he told me to raise the memory in the Processing Preferences.

I tryed that too, but it didn't work for me.

Another thing was that in none of the technics I tryed I could run the sketch inside Processing environment, I must always export an application in order for it not to run out of memory.

Is anyone going through the same problem ?
Has anyone encountered this trouble before ?

What would be the most memory efficient way to load and display multiple Gif animations ?

If not Gif, any other kind of animation file, that carries a transparent background would work for me.

I'm going to try loading the frames in a list, instead of in an array to see if it makes a difference.

Thanks evereyone for the help so far.

And please forgive the english and gramatical mistakes.
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PhiLho 
Re: GifAnimation memory problems
Reply #1 - Jun 3rd, 2008, 12:53am  
http://processing.org/learning/topics/sequential.html

There are (free) tools to transform an animated Gif to a series of images. Might be slower than loading the whole animation at once, but might avoid the issue.
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extrapixel
Re: GifAnimation memory problems
Reply #2 - Jun 3rd, 2008, 10:21pm  
hi andre,

can you post your code and upload the 30k-gif somewhere? or could you zip up your sketch-folder and email it to me?

thx,
patrick
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http://www.extrapixel.ch
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Andre_V._P.
Re: GifAnimation memory problems
Reply #3 - Jun 5th, 2008, 9:19pm  
thanks for the help.

here is the code I use to load files into a PImage[] array:


PImage[] anim;
pngIndex = 0;
 numPngs = 113;
 anim = new PImage[numPngs];
 for(int i=0; i<numPngs; i++){
   int zeros = 0;
   String pre = "t_";
   int div = i/10;
   while(div > 0){
     zeros++;
     div = div/10;
   }
   String zerinhos = "0";  
   while(4 - zeros > 0){
     pre = pre.concat(zerinhos);
     zeros++;
   }
   String number = str(i);
   String extension = ".gif";
   pre = pre.concat(number);
   pre = pre.concat(extension);
   anim[i] = loadImage(pre);
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