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Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Mar 15, 2025 6:38 am
by HotFudge
Hi Reset
Quick question regarding NVidia Shield Pro w.r.t v2.9 and v4.0
Resolve generates automatic L2 100,600,1000 v2.9 compatible trims
but the L8 100 trim equivalent in v4.0 is "empty" (set to 2048).
Will my Shield Pro take the L2 trims? or does it use the "empty" L8 trim.
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Mar 15, 2025 12:50 pm
by RESET_9999
HotFudge wrote: Sat Mar 15, 2025 6:38 am
Hi Reset
Quick question regarding NVidia Shield Pro w.r.t v2.9 and v4.0
Resolve generates automatic L2 100,600,1000 v2.9 compatible trims
but the L8 100 trim equivalent in v4.0 is "empty" (set to 2048).
Will my Shield Pro take the L2 trims? or does it use the "empty" L8 trim.
If your TV also supports cmv4.0, it won't use the L2 trims. The generated cmv2.9 L2 trims are here just to match the newer/updated cmv4.0 algo on cmv2.9 devices; you don't want your player/TV to use them.
see:
https://www.youtube.com/watch?v=15HTaR0hRvI
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Mar 15, 2025 2:52 pm
by HotFudge
Hi Reset
Thanks for your answer
So the L8 trim is used to make manual adjustments to the L2 trims
which are used aslong as it is all in v4.0.
Do you also maintain a list of v2.9 and v4.0 devices and TV's
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Mar 15, 2025 3:07 pm
by RESET_9999
No, but any hardware made after 2019 should have the cmv4.0 engine
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Mar 15, 2025 3:38 pm
by HotFudge
RESET_9999 wrote: Sat Mar 15, 2025 3:07 pm
No, but any hardware made after 2019 should have the cmv4.0 engine
Many Thanks
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Mar 15, 2025 4:28 pm
by deadchip12
@RESET_9999
I just did the transfer of cmv4.0 for the movie The Iron Claw (2023). Frame difference is +574. Seems pretty high. Other than that, watched the movie and there wasn't any problem.
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Mar 15, 2025 5:41 pm
by RESET_9999
deadchip12 wrote: Sat Mar 15, 2025 4:28 pm
@RESET_9999
I just did the transfer of cmv4.0 for the movie The Iron Claw (2023). Frame difference is +574. Seems pretty high. Other than that, watched the movie and there wasn't any problem.
it doesn't matter how big the frame difference is. It's fine as long as your source scene cuts are in sync.
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Mar 15, 2025 6:58 pm
by ragico
@Reset_9999
Thanks very much for your hard work and help, You are among the very few men who really helps.
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sat Mar 15, 2025 7:25 pm
by RESET_9999
You're welcome
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sun Mar 16, 2025 6:52 am
by deadchip12
@RESET_9999
I just watched your corelect configuration tutorial. Why is L6 set to Discard instead of Source?
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sun Mar 16, 2025 10:33 am
by RESET_9999
L6 is useless
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sun Mar 16, 2025 12:42 pm
by HotFudge
RESET_9999 wrote: Fri Feb 28, 2025 10:40 pm
yes, L2 is always ignored with a cmv4.0 RPU + hardware, even without L8.
Hi Reset
So does this mean in order to use my generated DaVinci Resolve RPU
I need to save it as v2.9 for it to use the L2 generated trims since
if I save the RPU as v4.0 it will just use the "empty" L8 v4.0 trim and
ignore the L2 generated v4.0 trims?
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sun Mar 16, 2025 1:37 pm
by RESET_9999
No, as I said, the generated L2 trim is meant to mimic the improved tone mapping of CMv4.0 on CMv2.9 devices.
CMv4.0 L1 + L3 is roughly equivalent to CMv2.9 L1 + L2.
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sun Mar 16, 2025 2:50 pm
by HotFudge
RESET_9999 wrote: Sun Mar 16, 2025 1:37 pm
No, as I said, the generated L2 trim is meant to mimic the improved tone mapping of CMv4.0 on CMv2.9 devices.
CMv4.0 L1 + L3 is roughly equivalent to CMv2.9 L1 + L2.
Ah sorry RESET.
I think I get it now
For cmv4.0
if L8 is empty then it will use L1+L3 generated metadata otherwise it will use L1+L8.
Thanks very much for your continue help.
Re: Dolby Vision now possible through MP4 Mux.
Posted: Sun Mar 16, 2025 2:55 pm
by RESET_9999
if L8 is active, it will use L1+L3+L8. Check out these metadata video comparisons:
https://drive.google.com/drive/folders/ ... dMiy2ka0mf