Repeated Bitmap draw() bug?

Hi there,

I wrote the code below to convert timeline-animated movieclips into bitmaps to improve performance.

The only problem is, I have created a loop to draw each frame of the movieclip over 300 times.

The bug I am experiencing is that when the function BitmapMC is run 314 times, I get the error: “ArgumentError: Error #2015: Invalid BitmapData.”

It seems as if Flash is running out of memory or something, but I can’t figure out what might be causing this problem.

Is there an alternative to draw() that I could use? I’d like to use copypixels, but of course I have to draw the bitmap first before I can do that.

Incidentally, the animation I have converting to bitmap has 30 frames, so in total it is drawing about 9,340 bitmap images before it crashes.

Each bitmap image is 78 x 125.5 pixels.

The code is below:

package com.jpardoe.utils
	import flash.display.MovieClip;
	import flash.display.Bitmap;
	import flash.display.BitmapData;
	import flash.geom.Rectangle;
	import flash.geom.Point;
	import flash.utils.Dictionary;
	import flash.display.FrameLabel;
	import flash.utils.Timer;
	public class BitmapMC extends MovieClip
		private var frameLabel:FrameLabel;
		private var frameNames:Dictionary = new Dictionary();
		private var frames:Dictionary = new Dictionary();
		private var bitmaps:Dictionary = new Dictionary();
		private var bd:BitmapData;
		private var bmp:Bitmap;
		private var mcWidth:Number;
		private var mcHeight:Number;
		private var i:int;
		private var j:int;
		private var currFrame:int;
		private var startFrame:int;
		private var lastFrame:int;
		private var rect:Rectangle;
		private var point:Point;
		public function BitmapMC(mc:MovieClip, scale:Number = 1):void
			mcWidth = mc.width;
			mcHeight = mc.height;
			// Cycle through frames to find maximum width and height
			// Set bitmap width/height variables accordingly
			for(i = 1; i<mc.totalFrames; i++){
				if(mc.width > mcWidth){
					mcWidth = mc.width;
				if(mc.height > mcHeight){
					mcHeight = mc.height;
			// Cycle through frames to detect all frame labels
			for(i = 0; i<mc.scenes[0].labels.length; i++) {
				frameNames[mc.scenes[0].labels*.frame] = mc.scenes[0].labels*.name;
			for(i = 1; i<=mc.totalFrames; i++){
				bd = new BitmapData(mcWidth, mcHeight, true, 0x00000000);
				//bd.fillRect(bd.rect, 0x00000000);
				bmp = new Bitmap();
				bitmaps* = bd;
				frames* = bmp;
		public function Play(frameName:String, freq:int = 30):void
			// Cycle through frameNames dictionary to find the start frame number, specified by frameName (e.g. finds frame number of frame named 'walk')
			for (var val:* in frameNames) {
				if(frameNames[val] == frameName){
					currFrame = val;
					startFrame = val;
			var frameTimer:Timer = new Timer(1000/freq);
			frameTimer.addEventListener(TimerEvent.TIMER, nextFrameFunc);
			function nextFrameFunc(evt:TimerEvent):void
				bmp.bitmapData = bitmaps[currFrame];
				lastFrame = currFrame;
				if(frameNames[currFrame] == 'repeat'){
					currFrame = startFrame;
				} else {

Any ideas would me much appreciated!