Dolby Vision now possible through MP4 Mux.

Please post here for issues related to UHD discs
dkangel
Posts: 5
Joined: Sun Oct 23, 2022 12:34 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by dkangel »

RESET_9999 wrote:
Fri Dec 27, 2024 2:59 pm
Thanks for explaining. How to interpret those? Is the madvr plot the best, because it has the most dynamics?
If I do the madvr measuremnt, I adjust cmv4.0 when I generate from madvr file with dovi_tool ,e.g.
No, madvr generated metadata (3-2) is the worst and not really suited for DV playback. Also, Madvr scene cut detection is not very good. It's quite sensitive to flashes/explosions/fast movement and can sometimes miss obvious scene cuts. The best dv metadata generation is one of the analysis tunings using Davinci Resolve. I prefer the ''balanced tuning'' which is the dovi_scripts default in workflow 3-1


Hello
in your video you said that we should choose most highlights details in resolve but now i see that you prefer balanced. So what is the best ? :D
RESET_9999
Posts: 2181
Joined: Mon Aug 05, 2019 7:12 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by RESET_9999 »

Yeah, when I did the video, I was using tuning 1.
After more tests/comparisons, I now prefer tuning 3 because it's a bit brighter without clipping. Both tunings are good though and tuning 3(balanced) is Resolve default.
dkangel
Posts: 5
Joined: Sun Oct 23, 2022 12:34 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by dkangel »

ok thank you :)
powdeau
Posts: 49
Joined: Sat Jan 12, 2019 1:01 am

Re: Dolby Vision now possible through MP4 Mux.

Post by powdeau »

Does Chroma Weight makes a big difference if it is used only in 100 nits trim?
RESET_9999
Posts: 2181
Joined: Mon Aug 05, 2019 7:12 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by RESET_9999 »

powdeau wrote:
Fri Jan 10, 2025 12:22 pm
Does Chroma Weight makes a big difference if it is used only in 100 nits trim?
yes and it doesn't matter if it's only a 100nits trim because whatever they did in the SDR trim gets extrapolated to any brightness.
thankfully CW is not used very often.
darrrkmanxxx
Posts: 86
Joined: Mon Apr 13, 2020 9:55 am

Re: Dolby Vision now possible through MP4 Mux.

Post by darrrkmanxxx »

RESET_9999 wrote:
Fri Jan 10, 2025 3:22 pm
powdeau wrote:
Fri Jan 10, 2025 12:22 pm
Does Chroma Weight makes a big difference if it is used only in 100 nits trim?
yes and it doesn't matter if it's only a 100nits trim because whatever they did in the SDR trim gets extrapolated to any brightness.
thankfully CW is not used very often.
so if there are no CW trims (flat line) at 1000nits and my device has 1000nits peak brightness, will it still be tone mapped because of the 100nit trim?
RESET_9999
Posts: 2181
Joined: Mon Aug 05, 2019 7:12 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by RESET_9999 »

darrrkmanxxx wrote:
Fri Jan 10, 2025 10:48 pm
so if there are no CW trims (flat line) at 1000nits and my device has 1000nits peak brightness, will it still be tone mapped because of the 100nit trim?
If there's a blank 1000nits trim, the 100nits trim gets ignored if your target brightness is 1000+
If there's a blank 600nits trim, the 100nits trim gets ignored if your target brightness is 600+

if there's just a 100-nits trim, yes the metadata gets extrapolated to any brightness but the higher your TV target is the less effect the trims have.
if you're using LLDV, and if you use an edid of 1000+ then the trims are 100% ignored if the RPU MDL is 1000nits (tested on shield, ATV, ugoos, x800m2 x700).

@powdeau confirmed to me that the trims are not ignored in TV-LED on the LG G4 with 1000nits RPU, so the behavior is different than LLDV because that TV must have a target higher than 1000nits.
I see the same behavior with my 2000nits Hisense TV, the trims always work regardless of the RPU MDL. So the trims not working in LLDV with 1000nits edid might be another DV bug.

He also confirmed that Chroma Weight doesn't work in cmv2.9 on the G4, same as my C2 and hisense TV. So dolby cmv4.0 fixed the Chroma Weight bug in LLDV and broke it in TV-LED for cmv2.9... typical Dolby...
powdeau
Posts: 49
Joined: Sat Jan 12, 2019 1:01 am

Re: Dolby Vision now possible through MP4 Mux.

Post by powdeau »

@RESET_9999 I have tried your metadata comparison for Kill Bill 1 and Smile 2 on my G4 and I don't see any changes with Kill Bill but I do se them with Smile.
Is it because Kill Bill has almost no trims in 1000nits or because Smile is mastered for 4000 nits?
RESET_9999
Posts: 2181
Joined: Mon Aug 05, 2019 7:12 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by RESET_9999 »

By the look of the L2 trims and the content brightness, it sounds normal.

Smile 2 is graded at SDR level but in some shot, the trims have very strong brightening values. So you probably see no change with L1, but a brighter image with L1+L2
kill bill is a bit brighter but still only 400nits and the trims don't brighten as much as Smile 2.

And yes, the RPU also has more effect when it's 4000nits MDL.
powfu
Posts: 3
Joined: Sat Jan 18, 2025 12:57 am

Re: Dolby Vision now possible through MP4 Mux.

Post by powfu »

RESET_9999 wrote:
Tue Nov 26, 2024 3:55 pm
RESET_9999 wrote:
Sat Nov 09, 2024 1:50 pm
anyway the problem is the EL and german discs
I wonder if all the French UHD-BD should be verified now. It looks like Blade 1998 FEL FRA BD has the same issue :(

https://slow.pics/c/YzYgHn4x
Hi, I'm just curious. I checked the FraMeSToR version which used the FRA UHD BD and MakeMKV. ffmpeg counts 172,927 frames and dovi_tool also counts 172,927 in the RPU as well. I've attached the plot. Is this release unaffected?

Parsing RPU file...

Summary:
Frames: 172927
Profile: 7 (FEL)
DM version: 1 (CM v2.9)
Scene/shot count: 2533
RPU mastering display: 0.0001/1000 nits
RPU content light level (L1): MaxCLL: 996.13 nits, MaxFALL: 427.95 nits
L6 metadata: Mastering display: 0.0001/1000 nits. MaxCLL: 1217 nits, MaxFALL: 884 nits
L2 trims: 100 nits, 600 nits, 1000 nits
Attachments
L1_plot.png
L1_plot.png (202.29 KiB) Viewed 749 times
skull88
Posts: 59
Joined: Mon Mar 27, 2023 3:08 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by skull88 »

AFAIK, it might matter which version of makeMKV is used, no? Could be how their encode wasn't affected. It does seem that it is worth verifying all EUR discs if using current version though.
RESET_9999
Posts: 2181
Joined: Mon Aug 05, 2019 7:12 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by RESET_9999 »

powfu wrote:
Sat Jan 18, 2025 1:06 am
Hi, I'm just curious. I checked the FraMeSToR version which used the FRA UHD BD and MakeMKV. ffmpeg counts 172,927 frames and dovi_tool also counts 172,927 in the RPU as well. I've attached the plot. Is this release unaffected?
I don't know, I'll check it out.
powfu
Posts: 3
Joined: Sat Jan 18, 2025 12:57 am

Re: Dolby Vision now possible through MP4 Mux.

Post by powfu »

RESET_9999 wrote:
Sat Jan 18, 2025 4:51 am
powfu wrote:
Sat Jan 18, 2025 1:06 am
Hi, I'm just curious. I checked the FraMeSToR version which used the FRA UHD BD and MakeMKV. ffmpeg counts 172,927 frames and dovi_tool also counts 172,927 in the RPU as well. I've attached the plot. Is this release unaffected?
I don't know, I'll check it out.
Using the Zapax FRA UHD BD and MakeMKV 1.17.8, I get the same results.

Code: Select all

Parsing RPU file...

Summary:
  Frames: 172927
  Profile: 7 (FEL)
  DM version: 1 (CM v2.9)
  Scene/shot count: 2533
  RPU mastering display: 0.0001/1000 nits
  RPU content light level (L1): MaxCLL: 996.13 nits, MaxFALL: 427.95 nits
  L6 metadata: Mastering display: 0.0001/1000 nits. MaxCLL: 1217 nits, MaxFALL: 884 nits
  L2 trims: 100 nits, 600 nits, 1000 nits

Code: Select all

Disc Title:     Blade.1998.2160p.FRA.UHD.Blu-ray.HEVC.TrueHD.Atmos.7.1-Zapax
Disc Size:      90,487,440,940 bytes
Protection:     AACS2
Extras:         Ultra HD
BDInfo:         0.7.5.9 (compatible layout created by DVDFab 12.0.7.0)

PLAYLIST REPORT:

Name:                   00006.MPLS  
Length:                 2:00:12.496 (h:m:s.ms)
Size:                   88,383,080,448 bytes
Total Bitrate:          98.03 Mbps

(*) Indicates included stream hidden by this playlist.

VIDEO:

Codec                   Bitrate             Description    
-----                   -------             -----------    
MPEG-H HEVC Video       77400 kbps          2160p / 23.976 fps / 16:9 / Main 10 @ Level 5.1 @ High / 4:2:0 / 10 bits / 1000nits / HDR10 / BT.2020
* MPEG-H HEVC Video     8644 kbps (10.05%)  1080p / 23.976 fps / 16:9 / Main 10 @ Level 5.1 @ High / 4:2:0 / 10 bits / 1000nits / Dolby Vision FEL / BT.2020

AUDIO:

Codec                           Language        Bitrate         Description    
-----                           --------        -------         -----------    
DTS-HD Master Audio             French          2576 kbps       5.1 / 48 kHz / 2576 kbps / 24-bit (DTS Core: 5.1 / 48 kHz / 1509 kbps / 24-bit)
Dolby TrueHD/Atmos Audio        English         4024 kbps       7.1+11 objects / 48 kHz / 3576 kbps / 24-bit (AC3 Core: 5.1-EX / 48 kHz / 448 kbps)

SUBTITLES:

Codec                           Language        Bitrate         Description    
-----                           --------        -------         -----------    
Presentation Graphics           French          0.272 kbps                      
Presentation Graphics           French          14.43 kbps
Attachments
L1_plot-Zapax.png
L1_plot-Zapax.png (202.29 KiB) Viewed 592 times
RESET_9999
Posts: 2181
Joined: Mon Aug 05, 2019 7:12 pm

Re: Dolby Vision now possible through MP4 Mux.

Post by RESET_9999 »

I dont know, I had an old rip so I assumed it was muxed with makemkv. Maybe not after all.
Some of my ST P7 rips were muxed with mkvtoolnix from DT P7 TS so that might be the reason.
powfu
Posts: 3
Joined: Sat Jan 18, 2025 12:57 am

Re: Dolby Vision now possible through MP4 Mux.

Post by powfu »

Alright, thank you. I guess this disc does not suffer from those issues then.

Just for posterity and completeness, using the Zapax FRA UHD BD and mkvmerge v89.0, the result is the same as above.
Post Reply