this post was submitted on 29 Sep 2025
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correct.
Incorrect.
Though there exist dual layer or DVD9 commercial releases they were usually either double features like 2 movies on a disk or 4 TV episodes or uncommonly long films (Lord of the Rings for example).
MOST commercially released DVDs were DVD5 or about 4.7GB in size. And this is based on oh 20 years of sample size.
On DVD encoding: Things get tricky in comparisons because AVC introduced a lot of tricks to get lower bitrates while maintaining a certain psycho-visual level of passing image quality that MPEG2/4 simply didn't have. It may not pass detailed frame by frame study of corner elements but for most people without perceptible quality loss you can knock the bitrate down meaningfully beyond the pure compression efficiency improvements of the follow-on codecs.
Most commercial film DVDs that I have seen are on DVD9. So much so that software exists such as "DVDShrink" so that pirates could compress DVD9 movies to a 4.5GB DVD-R disk.
I'm not sure what data you are looking at to think that most DVDs are sold at DVD5. I know for a fact that your statement about DVD9 only being used in special cases is not true. I've seen communities that specialize in sharing raw DVD disc images and I am certain that DVD9 images exist for almost every movie.