Better use this: Loadplugin("...\decomb.dll") Telecide() That's it. It has the advantadge to adapt to any fields order change. Your method doesn't seem to adapt to any fields order change.

You could use ComplementParity SeparateFields.DeleteFrame(0).AssumeFieldBased.Weave instead but whats the problem with your script? regards Simon

@DJ Bobo, Thanks! @siwalters, I wanted to know how to do it with AviSynth 1.xx, where AssumeBFF is not available.