I don't really know anything about this but I looked up Google and Wikipedia had something worth posting here.
http://en.wikipedia.org/wiki/Ntsc
Check the part titled "Frame rate conversion" as the 3:2 pulldown operation would seem to be what you need.
A site about making these operations yourself: http://documentation.apple.com/en/cinematools/usermanual/index.html#chapter=13%26section=3%26tasks=true
Best of luck!
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