well; first i made all my menus in Photoshop (PAR square pixels) i ve imported my menus in Encore to make the dvd; aswell as my video footage (PAR dv 1.07) . In After Effects i made a movie to put before my first menu (so you get the feeling that the menu flies in) also in PAR dv 1.07 .
The result is : the moment between the fly in animation and the beginning of my menu, you can see the swiching between the 2 files (because of their different PAR s)
It would be the easiest if i could just change the PAR of my menus in my Encore or Photoshop projects, not in AE