Mathematica 7 allows advance processing of graphics. I have used it to convert a series of PNG plots from root to this animated movie (~30MB) .

A minimal sufficient code is here:


path = "/Users/balewski/Desktop/outMovie/frame.png";
imgL = {}; 
For[i = 1, i < 95, i++, (* buil list of images *)
  	name = StringInsert[path, ToString\[i], -5];
  	img = Import\[name];
  	imgL = Append\[imgL, img]
  ];
M4 = ListAnimate\[imgL] (* build in-memeory animation *)
Export\["/Users/balewski/Desktop/jasM4b.avi", M4, "avi"] (* export animation *)


It is very slow, the last line - doing the 3 sec long movie - took an hour+.

Here is full "Mathematica Notebook" with working example, also show below as PDF.