[vampiredom]

Also lose the AssumeFieldBased() line... This is not what you want. You should instead use (if anything) AssumeTFF() or AssumeBFF() to tell AviSynth the field order of the clip. Also take a look at DGIndex -> mpeg2source() instead of DirectShowSource(). mpeg2source should set the field order correctly, so you probably won't need to "assume" anything.