Don't use zapstudio
http://www.zapstudio.net/framecalc/
^ this website is completely inaccurate in all of its conversions. My best advice is to download VirtualDub, a free program. The main UI has a frame counter at the bottom and it's very simple to cut the video down to just frame one of gameplay to the first frame of completion. I can even make a simple tutorial if necessary.
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