I need help with artifacts

can someone please help me

i’m using dvd decrypter 3.1.9 and dvd shrink 3.1

i’m getting artifacts on my backed up dvds

they’re like squares or lines of squares on the screen that show up even thou they’re not supposed to

does anyone know what causes this?

i heard that aggressive ram timings might have something to do with it so i put them back to default. still have the same problem thou

any help would be appericated