i don't want to make it more confusing

, but since this is a thread about the gop for the cartoon-type of movies, i think kwag meant that for the likes of 'monsters inc' etc u should use GOP 15. and for anime or 'drawn' cartoons, u should use 12? for PAL anyway.
'kvcd official specifications'
For animation, old cartoons, etc., we recommend a maximum GOP size of 12 pictures for NTSCFilm (23.973fps), 15 pictures for PAL (25fps) and 18 pictures for NTSC (29.97fps).
'latest optimal script'
For Anime/Cartoon material:
Same as DVD clean material, but shorten the GOP to 12 frames (PAL) or 15 (NTSC)
no, i won't lose any sleep over this :P