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.

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