AS3 GIF Animation Encoding Class 0.1 by Thibault Imbert

I have to admit that I just love animated GIF's, it reminds me the old school days playing the SNES ;)

Recently I found a java GIF encoder and decided to implement it in AS3, ok maybe some people will say it's just unuseful but here it is, I love it !

Everything is encoded through the player. Then you know the story, the GIF stream is sent through AMFPHP to a server to download it, and then save it to your hard disk. Any kind of images can be included in the final GIF, each frame is a flash.display.BitmapData object.

I'll post the sources in a few days, I want to add some more features, stay tuned !

Piterwilson did a funny experiment with this and the GIFPlayer class.

Here is how to generate an animated GIF stream in ActionScript 3 :

// we create the GIF encoder
var myGIFEncoder:GIFEncoder = new GIFEncoder();
// we call the start method to start a new GIF file stream
myGIFEncoder.start();
// we call the setRepeat method with 0 as parameter so that it loops
myGIFEncoder.setRepeat(0);
//we specify each frame delay in ms before each addFrame call
myGIFEncoder.setDelay ( 100 );
//we add each BitmapData as frames with the addFrame method
myGIFEncoder.addFrame( new BitmapData ( 200, 200 ) );
// we finalize the GIF stream by calling the finish method
myGIFEncoder.finish();
// then you retrieve the GIF ByteArray with the stream getter
var myGIFStream:ByteArray = myGIFEncoder.stream;

Online Demo :

A Flash animation should have appeared here, but it seems that your browser has an older version of the Flash Player or it is not installed at all. Please, install the last release of the Flash Player now, then reload this page.

The GIF Encoder looks nice on the Web Flash Festival 2007 screen :)

GIF Encoder on Screen

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.

Sources and documentation available at http://code.google.com/p/as3gif/

Comments (61)

  1. Tek wrote::

    This is a cool project. I can think to some good things to do with it.

    For the moment, the algorythm do not optimize well consecutives frames. If you use the same image in two consecutives frames, the generated image will almost be twice the size of the imagegenerated with only one frame with this image.

    I’m sure that the animated GIF algorythm could help you to do some optimizations not to include the same area in two (or more) consecutives frames when they are the same because most of the animated GIF software use this option.

    Wednesday, May 23, 2007 at 5:13 pm #
  2. Thibault Imbert wrote::

    Hi Tek,

    yes i’m going to double check that, I will also include some more features :)

    Some crazy things to do with this project.

    cheers

    Wednesday, May 23, 2007 at 5:25 pm #
  3. Han Sanghun wrote::

    Hi Thibault Imbert.
    I dare say this is NOT unuseful. Actually, one of my colleagues is developing a animated GIF encoder too.
    Regards.

    Wednesday, May 23, 2007 at 5:58 pm #
  4. Thibault Imbert wrote::

    Hi Han,

    Glad to hear that :) It seems that we all have ideas about what to do with it :)

    Wednesday, May 23, 2007 at 6:18 pm #
  5. Tek wrote::

    I’ve read a little what can be found on the internet and look at what my animated GIF edition tool (Jasc Animation Shop) could do. The best is simply the GIF specification : http://members.aol.com/royalef/gif87a.txt

    In fact, animated GIF do not offer a real way to create special frames for optimization, like video with I, P, B-frames. This can only be a succession of simple GIF image block.

    For consecutive images that are exactly the same, the optimization is simply to combine the duration of the display of the two images … not too complicated :)

    For the optimisation between two or more different consecutive frames, you must know that display on the screen of the GIF renderer must only be refreshed at the end and the start of the animation.

    It means that pixels that are not specifically redrawn by a frame will stay the same all the animation long.

    It is possible to use images that are not the same size and position (top,left) between each frame and you can position them the way you want. The optimisation is so to use images in frames that only define the changed area. To define several changed area on the same image you can use several frames with images of different position and size separated by a zero delay, the renderer will display them as a single image.

    Animation Shop Pro also use the transparent color on non-transparent GIF images to store the unchanged area. This process that can be quite simple for you to use and a better optimization for the file size if you decide not to offer transparent GIF images.

    But as said in private, the optimization could wait … it does what it says for the moment :)

    Wednesday, May 23, 2007 at 6:31 pm #
  6. dan wrote::

    Guys, you keep impressing :) thanks for the effort and can’t wait to see more of it.

    Thursday, May 24, 2007 at 5:50 am #
  7. Love it (and love the funky sample) !

    Tanks a lot…

    Thursday, May 24, 2007 at 10:27 am #
  8. Thibault Imbert wrote::

    hehe yes Bob,

    we love it foonky ;)

    Thursday, May 24, 2007 at 3:25 pm #
  9. I could use just a regular non animated gif encoder. Is there anyway you could post an encoder for non animated gifs? Or, if you could just let me know where you found the gif encoding algorithm that would be helpful too. About how long did it take you to convert it to AS3?

    Friday, May 25, 2007 at 6:39 pm #
  10. Thibault Imbert wrote::

    Hi Andrew,

    If you want to encode unanimated GIF, the actual GIF class I did has a addFrame method that takes an incoming flash.display.Bitmap object to compose each frame from the GIF.

    Just don’t add more than one frame and that’s it, I’ll post all the sources and references on tuesday ;)

    cheers :)

    Saturday, May 26, 2007 at 1:22 am #
  11. Piterwilson wrote::

    Very useful i think. Here’s something quick i put together with you gif encoder/player. Requires a webcam and flash9.
    Thanks for this encoder, i look forward to more.

    Tuesday, July 3, 2007 at 7:20 pm #
  12. Piterwilson wrote::

    url:

    http://www.piterwilson.com/wcsmt/index.html

    (Embarasing, forgeting to copy+paste)

    Tuesday, July 3, 2007 at 7:21 pm #
  13. Thibault Imbert wrote::

    Hi Piterwilson,

    Thanks for the link, it’s very nice and funny :)
    Love to see those classes used in a funny way ;)

    Tuesday, July 3, 2007 at 8:39 pm #
  14. Michel wrote::

    Hi,

    I’m trying to use this on my local server, but I can’t figure out how to make the PHP code to store the GIF file. I’m thinking I just need to store the stream, but I’m not that good with PHP.

    Could you post that part as well?

    Friday, July 6, 2007 at 2:20 pm #
  15. Piterwilson wrote::

    It works the same way as the jpg encoder php code.

    if ( isset ( $GLOBALS["HTTP_RAW_POST_DATA"] )) {

    / /get the binary stream
    $im = $GLOBALS["HTTP_RAW_POST_DATA"];

    $file=”myfile.gif”;
    $fp = fopen($file, ‘wb’);

    fwrite($fp, $im);
    fclose($fp);

    }

    Saturday, July 7, 2007 at 1:20 am #
  16. Michel wrote::

    Thanks a lot! didn’t know it was that simple..

    Monday, July 9, 2007 at 9:38 am #
  17. Thibault Imbert wrote::

    Thanks Piterwilson for helping Michel ;)

    Monday, July 9, 2007 at 9:53 am #
  18. doar wrote::

    hello
    i saw the little project of yours, can you share sources for the webcam / gif secvence?
    sorry for my bad english

    Wednesday, September 12, 2007 at 12:24 am #
  19. doar wrote::

    sry 4 double post, i was adressing to mr. Piterwilson i hope he’s watching this thread… i have an ideea on making a video sequencer but i need a point to start for a school project. Thanks.

    Wednesday, September 12, 2007 at 12:26 am #
  20. A heads up for AMFPHP users. Almost started to pull my hair out on this one.

    Your objectEncoding should be set to AMF3, not AMF0, otherwise you will get a 0kb gif file.

    Monday, December 3, 2007 at 2:31 am #
  21. Patryk@wolnosc.eu wrote::

    I also created GIFEncoder ( III 2007 )
    All frames capturef from WebCam @ 160×120

    20 frames
    My: 27 s – 340kb
    Your: 31 s – 284kb

    5 frames:
    My: 5s – 88kb
    Your: 8s – 72kb

    Wednesday, December 12, 2007 at 1:03 pm #
  22. jankrut wrote::

    Sir,
    when will u put the source of AS3 GIF Animation Encoding Class
    i don’t know anything about AMFPHP so want that in order to save any gif.
    so, please let me know when u put that source
    thanks

    Tuesday, December 18, 2007 at 9:05 am #
  23. Evgeny wrote::

    Hey,

    The project I am working on requires animated gifs. I need load, create/change and save animated gifs.
    Is there any chance you’ll chare this source?
    I am also willing to pay for it, if there any substansial code behind.

    In any case any help would be very appreciated.

    Monday, February 4, 2008 at 8:13 pm #
  24. Thibault Imbert wrote::

    Hi Evgeny,

    You can everything you need here :

    http://code.google.com/p/as3gif/

    let me know if it works smoothly :)

    regards,

    Thibault

    Monday, February 4, 2008 at 8:16 pm #
  25. Evgeny wrote::

    Many thanks for such prompt reply.
    Really!

    I will check it out and let you know.

    Monday, February 4, 2008 at 8:20 pm #
  26. Evgeny wrote::

    Hi Thibault,

    Do I need to connect to your gateway?

    I also see the “gifencoder.GIFEncoder.saveToServer” call. Is there a way to bypass it?

    Kind regards,
    Evgent

    Monday, February 4, 2008 at 9:07 pm #
  27. Thibault Imbert wrote::

    Hi,

    I use AMFPHP to save the GIF on the server and retrive it later.

    You can download AMFPHP and use it the same way I did.

    http://www.amfphp.org

    If you have problems setting up everything, I can send you an example.

    regards,

    Thibault

    Monday, February 4, 2008 at 9:14 pm #
  28. Evgeny wrote::

    Well. I am not familiar with AMPPHP, thus if you have anything under your hand, I would appreciate it very much.

    What if I would like to save it locally?

    Monday, February 4, 2008 at 9:30 pm #
  29. Vlad wrote::

    Hi,
    i’m really impressed by gif encoder. thank you.
    But i have a little problem.

    Finish gif is so big :(
    Where a real gif optimisation?
    Are there any parameters of oprimisation in your class?

    Thank you and sorry for may bad eng.

    Tuesday, March 11, 2008 at 11:55 am #
  30. Alen wrote::

    The performance is very slow and I get bytesAvailable = 0 in the debugger. I’m building my own sample with two BitmapData objects 400×400 size. Any ideas?

    Thursday, May 1, 2008 at 2:13 pm #
  31. Piterwilson wrote::

    Mr ByteArray,

    As you know i have been enjoying and using your classes a lot and i have run into a limitation and im trying to find where to look for information on where to bypass it.

    When i use this gif loader to load a very large animation, something above 2mb or so, it starts to ‘stall’ and fail to load depending on the user’s machine (i think).

    I have traced this problem to be triggered by the time out error which seems to come from the bytearray class (am i right?) probably line 508 of the GIFDecoder.as source file.

    Im trying to find out if there is a way to extend the time limit in which a time out is declared so that really long animations can be loaded without problem.

    Any ideas? If you can give me any tips on where to look, and if its possible at all, i would gladly implement a fix so the class is more stable.

    I also had some problems with the currentFrame being updated a bit later than needed but this is minor and can be fixed no problem.

    Thanks.

    Friday, July 11, 2008 at 4:41 pm #
  32. Piterwilson wrote::

    Sorry to double post, but in case anyone ahs the same problem i believe there are 2 ways to fix:

    1- i found out you can modify the script time out limit in the flash publish settings (duh!)

    2- i believe the GIFDecoder class on the read() method attempts to read everything at once (in ‘while’ loop), this is very bold of the class! a more sensible approach could be to instead use a ENTER_FRAME or TIMER event to do only one loop per frame (or one loop every so many miliseconds) and ease the load (even if it takes a bit longer) so that not THE WHOLE GIF has to be decoded at once :)

    Friday, July 11, 2008 at 5:33 pm #
  33. julie p wrote::

    Hi there – I’m confused about how to save a .gif locally – with the “generate gif” button you have there. i don’t see that button in the file i downloaded. i simply want to allow people to download a gif of the current stage. is this possible with your code?

    Thursday, July 17, 2008 at 3:30 am #
  34. tureki wrote::

    Hi,

    I?m trying to use this on my local server, but I can?t figure out how to make the PHP code to store the GIF file.I have trying to use this plan:
    if ( isset ( $GLOBALS["HTTP_RAW_POST_DATA"] )) {

    / /get the binary stream
    $im = $GLOBALS["HTTP_RAW_POST_DATA"];

    $file=?myfile.gif?;
    $fp = fopen($file, ?wb?);

    fwrite($fp, $im);
    fclose($fp);

    }

    But it is also cannot save GIF stream,I know how to using amfphp,but I don”t know how to save it ,can u shared your php code ? or give me some solvent.

    thank!

    ps:/ sorry my bad English

    Sunday, August 3, 2008 at 11:45 am #
  35. gino8080 wrote::

    this is so KOOL!

    but now with the flash player 10 and the great filereference,
    it is possible to save with the filerefence.save() a GIF animated file without using PHP server side?

    Wednesday, December 10, 2008 at 6:36 pm #
  36. Thibault Imbert wrote::

    Hi gino,

    Of course we can ! That is the cool thing with the Flash Player 10, no more server-side round tripping. ;)

    best,

    Thibault

    Wednesday, December 10, 2008 at 10:30 pm #
  37. Paulo Rocha wrote::

    Hello,

    I need HELP. Im using AMFPHP to save GIF file, but the file size is always 0 bytes(objectEncoding=AMF3). Somebody helpme?
    Sorry for my bad english.

    Codes:
    //////
    AS3:

    import org.gif.encoder.GIFEncoder;
    import flash.net.NetConnection;
    import flash.net.ObjectEncoding;
    //
    var myService:NetConnection = new NetConnection();
    myService.objectEncoding = ObjectEncoding.AMF3;
    myService.connect(“http://www.abarbearia.com.br/amfphp/gateway.php”);
    var myResponder:Responder = new Responder (onSuccesso, onErro);

    function onSuccesso(responds:Object):void {
    tstatus.text = “ok” + responds;
    };
    function onErro(responds:Object):void {
    tstatus.text = “error” + responds;
    };

    botao.addEventListener(MouseEvent.CLICK, _fbclick);
    function _fbclick(e:MouseEvent):void{
    var bmp1:BitmapData = new BitmapData (f1.width,f1.height);
    bmp1.draw(f1);//f1 – MovieClip to save
    //
    var myGIFEncoder:GIFEncoder = new GIFEncoder();
    //
    myGIFEncoder.start();
    myGIFEncoder.setRepeat(0);
    myGIFEncoder.setDelay (100);
    myGIFEncoder.addFrame(bmp1);
    myGIFEncoder.finish();
    //
    var myGIFStream:ByteArray = myGIFEncoder.stream;
    var streamObject:Object = {gifstream : myGIFStream};
    myService.call (“gifencoder.GIFEncoder.saveToServer”, myResponder, [streamObject] );
    };

    SERVICE – PHP

    data property
    $imageData = $bytearray->data;
    $idimage = date(“U”) . “.gif”;

    return ( $success = file_put_contents(“../../../lab/gifs/”.$idimage, $imageData) ) ? $idimage : $success;

    }

    }

    ?>

    Tuesday, December 30, 2008 at 11:08 pm #
  38. Paulo Rocha wrote::

    Sorry for double post.
    The PHP code is:
    data property
    $imageData = $bytearray->data;
    $idimage = date(“U”) . “.gif”;

    return ( $success = file_put_contents(“../../../lab/gifs/”.$idimage, $imageData) ) ? $idimage : $success;

    }

    }

    ?>

    Thanks!

    Tuesday, December 30, 2008 at 11:27 pm #
  39. Paulo wrote::

    Hi Thibault,

    you can send me the Service(GIFEncoder.php) to use with AMFPHP?

    Thanks and sorry for my bad english

    Wednesday, January 21, 2009 at 10:05 am #
  40. Muhammad wrote::

    When I hit the Generate GIF, I get this error thrown to me by flash player: Certain actions, such as those that display a pop-up window, may only be invoked upon user interaction, for example by a mouse click or button press.

    Monday, March 30, 2009 at 11:45 pm #
  41. Thibault Imbert wrote::

    HI Muhammad,

    This is due to new FP10 security restrictions, download method from FileReference should not be called outside a keyboard or mouse event. I will update the demo, thanks :)

    Thibault

    Monday, April 6, 2009 at 10:30 pm #
  42. DB wrote::

    Hey, I just downloaded this and gave it a shot – seems to work so great job! One thing, the first animated gif I tried loaded but didn’t display, the second one did. So I opened both in Fireworks to see the difference – turned out the first had a transparent background. So, did you know that transparent background gifs don’t display? And do you have a fix for this?

    Thanks! -DB

    Wednesday, April 15, 2009 at 10:05 pm #
  43. DB wrote::

    PS – when I exported that first gif back out of Fireworks without the transparent background it played just fine. -DB

    Wednesday, April 15, 2009 at 10:06 pm #
  44. Benjamin wrote::

    How can i resize an existing gif with your components?
    I use your gif player to load the gif and then i create an new gif an resize every single bitmap, but this takes to long.
    Thanks for help.

    Tuesday, September 15, 2009 at 5:02 pm #
  45. Kaiser wrote::

    Hi,

    I am just struggling to combine the encoder with the player. I use your example from above and the resulting byteArray for the GIFPlayer in “loadbytes”. After doing that, totalFrames always returns 0, no matter how many bitmaps I send to the encoder. I can send you the class is you want, nothing complex.

    Cheers!

    Monday, October 12, 2009 at 6:42 pm #
  46. Kaiser wrote::

    Hi!

    Strange, when I use the encoder, the byteArray is always 0 long, no matter how many bitmaps I am adding..

    Any idea? (using v0.4)

    Tuesday, October 13, 2009 at 1:35 am #
  47. Kaiser wrote::

    Ok, I found it, dunno if this is a bug or if I am stupid, but after encoding, you have to set the byte-pointer back to 0:

    myGIFEncoder.stream.position = 0;

    At least for the Playback.

    Tuesday, October 13, 2009 at 1:48 pm #
  48. Thibault Imbert wrote::

    Hi Kaiser,

    Sorry for the late response. Cool you found the problem, I will patch the latest version so that it automatically resets the pointer to 0.

    Thanks ;)

    Thibault

    Tuesday, October 13, 2009 at 1:56 pm #
  49. Marek wrote::

    First i would like to thank you for the gif classes, CUrrently i’m working on an project where i need to save gifs wirh reduced colors – 128,64,32 or 16. Is there an option in the gif encoder class to reduce colors? I have tried a few things – reduced the colors in the NeuQuant Class but that didnt work. What would you do to reduce colors an export an animated gif? I suppose you havve to create a palette of (for example 64 colors) for all frames!?

    Tuesday, November 3, 2009 at 10:14 am #
  50. Benjamin wrote::

    What about my problem? Will there be a resizing method?
    My problem is the color palette for every frame. It takes to much time to calculate it for every frame. Can i take the color palette from the given animation and use it for the resized animation?

    Thanks and Greetings
    Benjamin

    Monday, February 15, 2010 at 3:43 pm #
  51. Hi I am Japanese wrote::

    hello!

    I am Japanese.

    this message was created by Google Translate.

    Can I use the commercial?

    I’m trying to sell the software with this encoder.

    if I can use the commercial I link your page.

    I am sorry.

    I can not speak English : (

    please mail my e-mail address.

    Friday, March 12, 2010 at 12:17 pm #
  52. Thibault Imbert wrote::

    Hi my Japanese friend :)

    Of course you can use it commercially. No problem ;)

    best,

    Thibault

    Friday, March 12, 2010 at 12:25 pm #
  53. Hi I am Japanese wrote::

    Thank you very much!!

    Friday, March 12, 2010 at 1:21 pm #
  54. Hi I am Japanese wrote::

    My nickname is Somila.
    Nice to meet you!

    Can this encoder create a transparent gif?

    I can speak a little English:)

    Saturday, March 13, 2010 at 3:49 am #
  55. Stone wrote::

    When I save the GIF decoder’s stream to a file, it cannot be displayed correctly. Why….

    Sunday, April 25, 2010 at 1:21 pm #
  56. Abarrow wrote::

    I’ve been using this class in an image editing program I’ve been writing and I’ve noticed a problem. When I load an image with thousands of colors and try to save it as a gif it fails. Is there anyway that I/you could modify this class to allow it to generate pallets when given an obscene number of different colors?

    Thursday, July 15, 2010 at 3:22 pm #
  57. Eldar wrote::

    Thank you for your job!

    I have some problem. I add 8 frames by this manner:
    // creating Array of BitmapData in loop by snap some sprite;
    var gifSource:BitmapData = new BitmapData (106, 106, false, 0xf29a9a);
    gifSource.draw(spriteCont, null, null, null);
    framesArray.push(gifSource);

    // then add them to GIF
    myGIFEncoder = new GIFEncoder();
    myGIFEncoder.start();
    myGIFEncoder.setRepeat(0);
    myGIFEncoder.setDelay ( 1000 );

    myGIFEncoder.addFrame(framesArray[0]);
    myGIFEncoder.setTransparent(0xf29a9a);
    myGIFEncoder.setDispose(2);
    myGIFEncoder.addFrame(framesArray[1]);
    myGIFEncoder.addFrame(framesArray[2]);
    myGIFEncoder.addFrame(framesArray[3]);
    myGIFEncoder.addFrame(framesArray[4]);
    myGIFEncoder.addFrame(framesArray[5]);
    myGIFEncoder.addFrame(framesArray[6]);
    myGIFEncoder.addFrame(framesArray[7]);

    myGIFEncoder.finish();

    And I have only 3rd frame with transparent background:
    http://kalb.ws/temp/some.gif

    Can you say me what is wrong.

    Saturday, November 27, 2010 at 2:46 pm #
  58. Forrest wrote::

    How to use the transparency of a bitmapdata that already has an alpha channel?
    AND If I setTransparent(0×00000000) only a few frames are converted correctly..what’s wrong?
    I really need this wonderful class :(

    Tuesday, August 30, 2011 at 4:25 pm #
  59. Forrest wrote::

    still no luck, this class doesn’t handle transparency correctly…Thibault can you help? :(

    Friday, September 9, 2011 at 1:26 pm #
  60. Roman wrote::

    Thank you for all.
    Thibault, Can you help me please?
    When I created some a gif, class encoder created stream for a gif, so when I want to play created gif, i use .loadBytes(bytes) method, but it don’t play loaded by stream (((
    But .load(url) method perfectly works.
    What my wrong?

    Sunday, November 6, 2011 at 4:54 pm #
  61. Keyneko wrote::

    Hello, thanks for your classes,
    but this gifplayer doesn’t handle transparency correctly, what method can be solved?

    Friday, March 23, 2012 at 7:34 am #

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