I just completed the 48hr Film Project in Philadelphia and had the same problem with our footage shot on a Canon XL2 at 24P. Editing in Final Cut the cut looks great. But when I went to do a 4:3 letterbox version it turned out with horrible artifacting, crunchiness in the detail, and pronounced stair stepping. I think it is from incorrect deinterlacing and then scaling 480 vertical lines down to the center 360 lines.
I tried copy/pasting the Final Cut sequence into a non-anamorphic 4:3 sequence and I also tried it several times in After Effects. I tried the “Guess Pulldown” and the “Guess Advanced 24P” buttons under “Interpret Footage.” I also tried conform to 24 fps.
After a weekend of litte sleep, I’m desperatre for help. I would really like to understand what I’m missing here because I think I have some grasp of the theory behind it.
Thanks,
Luke Krill
luke@haleypro.com
Senior Producer
Haley Productions
http://www.haleypro.com