Manixx2020beyound wrote: ↑Wed Jul 28, 2021 4:49 pm
.........Secondly any nit value entry in the dv data block lum section will override the hdr avi lum entry
10k nit in both hdr/avi - dv- data block ............
.............No way 10k nit work in both lum entries that’s for sure......
The DV Data Block does not override the HDR/AVI settings, that's what I am saying I do and have proven over and over by doing it personally! I get the blown out highlights like you're saying when I ONLY change the DV Data Block, but then I immediately change the parameters in the HDR/AVI Max Luminance section to 10,000 nits and it magically then tone maps and makes the image with much details and NO CLIPPING, even in scenes which are easily noticeable like I said, The Meg chapter 8 (overturned boat) and Aquaman chapter 6 (Aquaman in chains looking at his brother the king with bright white elaborate framed window behind him).
What you have to do and maybe what I wasn't clear on, is that for those very bright movies and to ensure no clipping with DTM, then you have to set the DV Data Block to 1,000 nits (not 10,000) but set HDR/AVI max luminance to 10,000 nits. I have seen that the movies mastered at 1,000 nits and streaming movies from Netflix, iTunes, AppleTV+, etc. that the DV Data Block at 10,000 nits works extremely well and that is how I watched Army of the Dead, which was incredible. For any 2,000 - 10,000 nit source, you do need to set DV Data Block to 1,000 nits though. This is also what I recommend as a good "set and forget" setting to get full DTM for ANY source, but then I have to set the HDR Brightness to its "0" default setting. It doesn't look quite as good as the full 10,000 nit version when watching streaming iTunes and Netflix, so to ME at least, it's worth switching modes, which is only one button push on my Harmony anyway, so simple.
I think what you and some others
may have done when testing this is set the DV Data Block and HDR/AVI's max luminance settings and not stopped the video, gone back to the GUI/Menu, and then restart it all from scratch so the new EDID and Custom Data takes effect. I have done that on many occasions and forgot to restart and was SO angry thinking I knew it worked before and I knew I changed parameters, but then eventually realized I didn't restart so the new settings didn't take effect. Once I did the difference was clearly apparent!
Manixx2020beyound wrote: ↑Wed Jul 28, 2021 4:49 pm
......Also how are u comparing what your seeing to what’s its soposed be hopefully not by just a visible glance or watching,
That’s not a sure shot way of saying what your seeing matches the original??
Some comparison from the signal your getting would be nice to valadate your actual inputs in the vertex2.
I have done many workflow HDR jobs using this method with my CalMAN for Business software and i1Pro2 spectro, which bears out the proper tone mapping.
I also have an LG 65C8 OLED which does TV Led DV and have looked at both using the same scenes. I am not saying that I don't agree there isn't an LLDV bug. I was just saying that it appeared to me that Vincent's conclusion wasn't based on enough data when he posted that video as he only appeared to have tested one UHD Bluray player, an Oppo 203 I believe. Now that you and others are coming in with more data, then it makes it more factual where the root cause is.
I also want to stress that I am mostly using an AppleTV 4K newest generation with Infuse app on ripped UHD Blurays, as well as iTunes, Netflix, etc. streaming 4K UHD DV titles. Most of your and Vincent's analysis is done using discs and disc players, no? Have you tested AppleTV using Infuse, converting the ripped HDR10 movie to LLDV to see if that shows the same bug?
I will have to watch Vincent's video again. I don't recall everything that was reported exactly.
I will post some quick comparison phone pictures showing how changing the HDR/AVI tab's max luminance to 10,000 nits eliminates clipping and does DTM. It won't be for image quality, just to show how it brings back all the highlight details in the clouds, window frame, etc. It also does the same for the low level shadow details too.
