STEVEN Excellent utility.
I used it to convert a movie into images which I need for an OpenGL computer game. This is the only program that could do it (out of 10 I tried) and is understandable. It is fast too. The editing of the movie is great (shift key to select a portion of the movie). The only disadvantage is probably that it makes one big image instead of several smaller. As it turned out this was actually an advantage because now I could add an alpha chanel and color adjustments in one go.
Problem is the pricing, but it seems to work fine even if you haven't paid.
(Version 1.0)