Provided that you are exporting from AE as PAL 720 x 576 (1.46), iDVD - which I don't know - should do the 16:9 aspect ratio conversion.
Does iDVD give you a choice of ratio output? 4:3 is 1.09 ratio, whereas 16:9 anamorphic, which I assume is the one you want, is 1.46 ratio.
If you author in square pixels, 16:9 would be 1050 x 576 pixels (1.82 ratio)
Thanks for your reply.
This is CS3 I'm using. I think PAL D1/DV widescreen is the equivelent of PAL 1.46 in CS5. So I am using that setting, and I can't seem to find any output settings on iDVD except Pl or NTSC and 4GB or 8GB DVDs.
Ah, I have that window but no option for 4:3 or 16:9.
I was wondering this... I think it must be an old version of iDVD. Since it's a work machine they won't let me connect to the internet or update any software.
Was there a work around back in the old days? ;P