[QUOTE=notoriousii;2414989]For movies 2 hours or less DVD-RB looks the best. For movies over 2 hours and definitely for movies over 3 hours, this often includes movies with rated and unrated versions,
DVD-Shrink looks better to me.[/QUOTE]
It doesn’t work like that though as it depends on the content of the film, how well the existing motion vectors have been done and how well the existing compression is optimised.
Or in other words you could have a long film with very few fast moving scenes, where the compression hasn’t been very well optimised and you’ll have good scope for further compression.
On the other hand you could have a relatively short action film with stacks of fast moving scenes, film grain, changing camera angles, fast moving pans etc, where the compression has already been very highly optimised and you’ve next to no scope for further compression.
So it depends on a number of factors as well as length.
I’ve even come across certain DVDs that are in my opinion unacceptable quality even when fully re-encoded.
This is very exceptional though and thankfully such discs are rare.