Here's a code to get cutscenes to go fullscreen in persona 4 while using a 16:9 aspect ratio, I modified the original widescreen hack because i didn't like how sometimes chars that were supposed to be off screen just ran in place.
Code:
gametitle=Shin Megami Tensei: Persona 4 (SLUS-21782B)
//FMV's fix by nemesis2000
patch=1,EE,0046957c,word,1460000a
patch=1,EE,00469584,word,3c03c294
patch=1,EE,00469588,word,10000008
patch=1,EE,0046958c,word,00000000
patch=1,EE,004695a8,word,3c03c1a8
patch=1,EE,004695bc,word,00000000
//Progressive Scan & 60fps
patch=1,EE,0041751c,word,3c050000
patch=1,EE,00417524,word,3c060050
patch=1,EE,0041752c,word,3c070001
Are you loading from a quick save? Quick saves keep the patch intact.