Obviously when you capture, the video is field based because that's how it is transmitted from the LD player to the capture card. However AVISynth assumes frame-based video by default, so as long as the field order is correct, the full progressive frame is automatically reconstructed and you don't need to do anything else with it.
Obviously when you capture, the video is field based because that's how it is transmitted from the LD player to the capture card. However AVISynth assumes frame-based video by default, so as long as the field order is correct, the full progressive frame is automatically reconstructed and you don't need to do anything else with it.