the resulting file would be enormous.
No joke there, I tried to make a lossless single disc copy of Das Boot recently (the uncut, almost 5 hour long version), and it went from a 7.73 GB source to over 31 GB! Which of course didn’t work as an SD Blu-ray. I seem to have a knack for picking problematic video projects 😃
Actually, a lossless AVI rendered from a 2 hour, 30GB movie would be at least 300GB.