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Re: Dolby Vision now possible through MP4 Mux.
Posted: Thu Mar 27, 2025 8:59 am
by nekno
Thanks. PM4K works, so I'm expecting it's bug in Composite that I'll look into patching.
Re: Dolby Vision now possible through MP4 Mux.
Posted: Fri Mar 28, 2025 5:56 pm
by dysprosium
Hi RESET_9999, I have a question regarding the Chroma Weight bug on the LG models since 2022.
I currently have a C9 with an Ugoos AM6+ using CPM A14 build. I was thinking about upgrading to a G4 or G5 this year, but I just learned about the Chroma Weight bug on these newer models.
I think you have a C2 with the Ugoos w/ CPM build; what's your workaround for accurately watching CMv2.9 movies that have L2 chroma weight trims? If you use TV-led, the C2 ignores the CW trims, and if you use player-led, on the Ugoos w/ CPM build LLDV is only CMv2.9 so the CW trims still don't work.
There are some affected CMv2.9 UHD BDs such as A Quiet Place: Day One for which WEB CMv4.0 L8 metadata exists, that can be transferred to the BD remux to effectively work around the issue, since the bug doesn't affect TV-led CMv4.0 L8 CW trims. But there are some UHD BDs such as Saving Private Ryan, Jaws, Dune (2021) etc. for which WEB CMv4.0 L8 metadata doesn't exist, what to do for those?
Are there any recent OLED models that you know of that don't have this Chroma Weight bug? Would you recommend buying a different TV to the G5 if it is also confirmed to have this bug, or do you think the Chroma Weight bug affects all new CMv4.0 TVs?
Re: Dolby Vision now possible through MP4 Mux.
Posted: Fri Mar 28, 2025 6:48 pm
by RESET_9999
dysprosium wrote: Fri Mar 28, 2025 5:56 pm
Hi RESET_9999, I have a question regarding the Chroma Weight bug on the LG models since 2022.
I currently have a C9 with an Ugoos AM6+ using CPM A14 build. I was thinking about upgrading to a G4 or G5 this year, but I just learned about the Chroma Weight bug on these newer models.
I think you have a C2 with the Ugoos w/ CPM build; what's your workaround for accurately watching CMv2.9 movies that have L2 chroma weight trims? If you use TV-led, the C2 ignores the CW trims, and if you use player-led, on the Ugoos w/ CPM build LLDV is only CMv2.9 so the CW trims still don't work.
There are some affected CMv2.9 UHD BDs such as A Quiet Place: Day One for which WEB CMv4.0 L8 metadata exists, that can be transferred to the BD remux to effectively work around the issue, since the bug doesn't affect TV-led CMv4.0 L8 CW trims. But there are some UHD BDs such as Saving Private Ryan, Jaws, Dune (2021) etc. for which WEB CMv4.0 L8 metadata doesn't exist, what to do for those?
Are there any recent OLED models that you know of that
don't have this Chroma Weight bug? Would you recommend buying a different TV to the G5 if it is also confirmed to have this bug, or do you think the Chroma Weight bug affects all new CMv4.0 TVs?
I’d take a 2500-nit G5 with the CW bug over a 700-nit C9 without it any day.
The CW bug would only be an issue with 2500-nit or brighter grades and only if it's CMv2.9, so most content will be just fine. I really can’t wait to get the G5.
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Mar 29, 2025 12:55 am
by deadchip12
@RESET_9999
I'm working on cmv 4.0 transfer for the movie Mufasa: The Lion King (2024). Frame difference check shows 0 difference. When I run 2-3, the scene_cuts.txt files are generated (which also say no differences) but the RPU_verify_sync2.bin is not generated. Is that normal?
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Mar 29, 2025 1:04 am
by RESET_9999
yes, when the RPUs frame count and sync are identical, it doesn't edit the source (web) RPU.
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Mar 29, 2025 7:54 pm
by staknhalo
Also, not all the time, but 9 times out of 10 when you have a web RPU + UHD that line up perfectly from the start with no edits needed - it's gonna be a Disney title I've found
Re: Dolby Vision now possible through MP4 Mux.
Posted: Mon Mar 31, 2025 7:29 am
by daffie
dysprosium wrote: Fri Mar 28, 2025 5:56 pm
Hi RESET_9999, I have a question regarding the Chroma Weight bug on the LG models since 2022.
Just to confirm, the LG G1 from 2021 does NOT have this Chroma Weight bug ?
Re: Dolby Vision now possible through MP4 Mux.
Posted: Mon Mar 31, 2025 8:22 am
by razierklinge
Hey @RESET_9999, quick question. When you're grabbing 4K WEB-DL TV releases, do you get the DV P5 or P8 versions?
I usually grab P5 to use with my Ugoos, but since Plex now has HEVC support I've been considering getting the P8 releases for friends to stream. Losing DV quality is a tough call for me, but I'm wondering if it's negligible with WEB-DL's.
Re: Dolby Vision now possible through MP4 Mux.
Posted: Mon Mar 31, 2025 11:20 am
by RESET_9999
Re: Dolby Vision now possible through MP4 Mux.
Posted: Mon Mar 31, 2025 11:37 am
by daffie
Hmm wait, this bug is only there on LLDV or Player LED ?
Because the test files are located in the ''LLDV bug'' folder...
I'm confused now because user @dysprosium mentions also this bug when using TV LED...
Re: Dolby Vision now possible through MP4 Mux.
Posted: Mon Mar 31, 2025 12:17 pm
by RESET_9999
there's a bug with TV-LED since 2022.
LLDV cmv2.9 devices is the original CW bug.
So they fixed the bug for LLDV with cmv4.0 devices (shield, appletv) but introduced the same bug in TV-LED since 2022 lol... Dolby is funny.
Re: Dolby Vision now possible through MP4 Mux.
Posted: Mon Mar 31, 2025 12:39 pm
by daffie
Haha, ok. Thanks for clarifying
Re: Dolby Vision now possible through MP4 Mux.
Posted: Mon Mar 31, 2025 2:06 pm
by RESET_9999
Found some other interesting difference between HDR10 and DV on my C2.
HDR10 has horrible banding in the Martian and Kingsman samples but it's clean in DV.
HDR10 also has horrible posterization in the black fade samples (quiet place) but again clean in DV. (this confirmed on LG B9 too)
files:
https://drive.google.com/drive/u/1/fold ... KkCkKrH3JG
Also found a good example of the cmv2.9 black crush issue with real content:
crushed cmv2.9 (original):
https://drive.google.com/file/d/16f25Yk ... drive_link
no crush cmv4.0:
https://drive.google.com/file/d/1IXBaCE ... sp=sharing
no crush HDR10:
https://drive.google.com/file/d/1YlS1Im ... drive_link
Re: Dolby Vision now possible through MP4 Mux.
Posted: Mon Mar 31, 2025 5:43 pm
by staknhalo
razierklinge wrote: Mon Mar 31, 2025 8:22 am
Hey @RESET_9999, quick question. When you're grabbing 4K WEB-DL TV releases, do you get the DV P5 or P8 versions?
I usually grab P5 to use with my Ugoos, but since Plex now has HEVC support I've been considering getting the P8 releases for friends to stream. Losing DV quality is a tough call for me, but I'm wondering if it's negligible with WEB-DL's.
If you want a 'technically better' file - go with P5, but then you (possibly, depending on use case) need a HDR10 fallback file as well for watching on non-DV devices so double file/storage space needed - or if you go p8 technically a little less better than p5 (not really much but still) but has HDR10 fallback so no double file/storage space needed for p8 - pick your poison basically
I just do p8 because of the amount of movies + shows I have I need to save storage space more than I care about what I'm losing with p5>p8
Re: Dolby Vision now possible through MP4 Mux.
Posted: Mon Mar 31, 2025 5:59 pm
by razierklinge
staknhalo wrote: Mon Mar 31, 2025 5:43 pm
razierklinge wrote: Mon Mar 31, 2025 8:22 am
Hey @RESET_9999, quick question. When you're grabbing 4K WEB-DL TV releases, do you get the DV P5 or P8 versions?
I usually grab P5 to use with my Ugoos, but since Plex now has HEVC support I've been considering getting the P8 releases for friends to stream. Losing DV quality is a tough call for me, but I'm wondering if it's negligible with WEB-DL's.
If you want a 'technically better' file - go with P5, but then you (possibly, depending on use case) need a HDR10 fallback file as well for watching on non-DV devices so double file/storage space needed - or if you go p8 technically a little less better than p5 (not really much but still) but has HDR10 fallback so no double file/storage space needed for p8 - pick your poison basically
I just do p8 because of the amount of movies + shows I have I need to save storage space more than I care about what I'm losing with p5>p8
Yep that's what I'm leaning towards doing just for the compatibility with friends watching on Plex. I just wasn't sure how much of a quality loss it was comparing P5 vs P8 in a WEB-DL situation.