once you get used to that 2 step workflow you dont need many previews anymore
i do max 50 frames previews of different szenes but i dont render them to hd.
if veai crashes on .vob only, i guess there is something else wrong with your system.
as i never had this … not with an 1060, 3070 or 3090 …
i hope you dont upscale directly from the dvd drive…
and you copy the vob files to the fastest harddrive in your system first
i am using nvidia studio drivers only
and i keep my codecs always up to date with the K-Lite Codec Pack
to be honest, upscaleing dvds with an 1060 is no fun.
Thats really slow and time consuming.
Before the 3070 i had a 1060 only and i know how slow it was.
no i use always a fix value
for 1080p its 20 …
for 4k i use 25