i did some mega googling yesterday, but couldn't find even a shred of docs on the subject, basically what would editor want is the ability to encode to:
prores 422 LT
prores 422 standard
prores 422 HQ
prores 444
clues?
edit: staring at the code
http://git.videolan.org/?p=ffmpeg.gi...2e336b;hb=HEAD
first 3 seems plausible, but no idea how should that transform into ffmpeg command line...