Dolby Vision now possible through MP4 Mux.

[kazuma]

why are some movies 4000nits MDL on the disc? and other ones 1000nits? what are the differences?

[coopzr]

@RESET_9999 In the case of How to Train Your Dragon (2025), why would the artist put all that effort into a detailed 100nit trim, only to cancel it at 300nits? Feels like a waste of time and effort.

Also, how do the saturation and hue fields work? Are they applied regardless of TV capabilities, or do they target a specific trim?

[RESET_9999]

why are some movies 4000nits MDL on the disc? and other ones 1000nits? what are the differences?

it's a studio decision to grade movies on 4000 or 1000 nits mastering monitor.

@RESET_9999 In the case of How to Train Your Dragon (2025), why would the artist put all that effort into a detailed 100nit trim, only to cancel it at 300nits? Feels like a waste of time and effort.
Also, how do the saturation and hue fields work? Are they applied regardless of TV capabilities, or do they target a specific trim?

Because the 100-nit trim is delivered for the SDR Blu-ray release. Personally, I like when they explicitly cancel trim interpolation to other targets like that. It shows that the colorist knows what he’s doing and that he wanted the 100-nit trim to be more aggressive while keeping the higher targets intact, since most of this movie sits under 300 nits anyway and don't need tone mapping.

When they apply a strong 100-nit trim, if they push it too far, it can result in higher targets appearing brighter than the HDR master. That doesn’t really make sense, because with a 1000-nit MDL DV grade, those trims will be ignored on TVs with a peak brightness higher than the 1000 nits MDL. So if the 100-nit trim ends up brightening beyond the master, an 800-nit TV could actually show a brighter HDR presentation than a 1000-nit+ TV, which isn’t logical. The whole purpose of trims is to fine-tune tone mapping when the content exceeds the TV’s capabilities, not to make the image brighter than the HDR master itself.

[coopzr]

Because the 100-nit trim is delivered for the SDR Blu-ray release.

Makes sense.

Do you mind explaining what saturation and hue fields are and how they work? I don't recall you talking about them in your explanation videos. The only thing I know is that they have something to do with colors... and they appear to be set by the colorist during some parts of movies.

[RESET_9999]

They’re essentially just extra fine-tuning colors controls for the colorist during the SDR trim pass creation. I don’t think I’ve ever seen a 600–1000-nit trim that actually makes use of them, but it’s possible.