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A minimal sufficient code is here:
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path = "/Users/balewski/Desktop/outMovie/frame.png";
Wiki Markup
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 *)
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It is very slow, the last line - doing the 3 sec long movie - took an hour+.
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