Thanks! Hmm. AviSynth is script-only, right? No GUI or timeline-based editing ability?

I’m hoping to get the frames out on an editing timeline so I can, say, delete one, swap two others, etc. Just poke at and mess with them ad nauseum. I have no idea how to do any of that with scripts.

Are you suggesting that I split them in AviSynth, then import that into another program and edit it – then export it and weave the fields back together in Avi as a final step?

Alternately: do you know if this is possible in AfterEffects? I believe I read that it has a field-separating ability, but I don’t know much more.