how to manipulate images in a swf document, through its xml counterpart

Hello, i have converted my swf document to xml using a java package in order
to manipulate(filtering etc.) image contents and replace them back to the
same document. I think this can be achieved easier by using the xml file.
Here is my piece of code that returns a null image data:

List imgList = root.getChildren("definebitsjpeg2");
ListIterator imgListIter = (ListIterator) imgList.iterator();
while (imgListIter.hasNext()) {
    Element imgEl = (Element) imgListIter.next();
    byte[] imgBytes = Base64.decode(imgEl.getText());
    ......
}
//imgBytes is returned null in the first iteration, what is the probable
reason you guess?

regards.
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