Looping the same video to compare different coordinates at various frames

hello,
I am trying to analyze the x-coordinate of the first frame as compared to the second frame and calculate how much it has changed. I have attached a vi and tried to add in a second set of icons that do the same thing but starting start reading at i + 1; the problem is that since the file is already open it cannot run through two IMAQ AVI Read Frame, etc. I have deleted the second set, because it doesn't work, but have no ideas as to how to accomplish the comparison. Any suggestions?
thanks,
mgg
Attachments:
test centroid.vi ‏169 KB

nevermind. i figured it out.

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Thanks for your help...i think i am really getting this. And have learned a lot.
I had to go back to my computer programming and flowcharting skills to figure out the flow :-)
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Looping the same video to compare different coordinates at various frames

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