PS: Since AVIs don’t store the field order, QTGMC+ will fail at detecting the right field order.

AVISynth+ will assume BFF, which is correct for pretty much any DV (there are very few exceptions). But QTGMC+ will try to be clever and assume the field order on its own. And might determine your field order to be TFF (since that is its default).

If you need it, I’ll provide you with a script to change the field order to always be TFF.