Try AssumeTFF() first and scrub the video through parts with motion. If the video jerks back and forward have bff video and should use AsuumeBFF(). In any case to confirm that you are right try the opposite function and look for jerky video in parts with motion.
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Specs: Intel Core 2 Quad Q6600(4*2.4GHz), Win XP Pro SP2, 2 Gb DDR2, 1*120Gb HDD, 1*500Gb HDD
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