Originally Posted by Archibald1
How does the LLDV mod work and what would I need to be able to use it myself? PM me if easier.
In a nut shell... Dobly has a Dolby Vision (DV) solution for displays which by design lack the processing power to deliver the DV experience. Both Sony and LG have such displays. The particular display, maybe the 1st, was/is the Sony A1 OLED.
The solution was to have the source device provide the DV processing and output an HDR10 signal which has been tone mapped. This process is known as LLDV Player Led DV processing.
TheLLDV capable source devices known so far are:
OPPO 203 and 205 players (not sure about the variants)
Sony x700, x800m2 and x1100es players
Apple TV 4k 32 & 64 streaming boxes
These devices, when connected to the Sony A1 OLED, would enable the Dolby LLDV (player Led) DV processing.
Enter the HDFURY.
As in previous EDID challenged situations, a HDFury Vertex, Vertex2, Diva and Maestro, have the capability to spoof these sources devices to think they are connected to the Sony A1 or other LG displays, depending on which HDfury device you have. The older Vertex has the more limited LLDV support, but it works well enough to support the Sony A1 LLDV EDID on it's two input/output connections. Which I will use with the Sony x800m2 and ATV4K 64.
Now, the consensus at 1st was, the LLDV process might only work with DV mastered content. But it turns out, the DV tone mapping process, also works with HDR10 mastered content. So in both cases, it appears the LLDV process is working frame by frame, establishing a histogram, to process the source and provide an HDR PQ10 (EOTF) compliant output signal, which would work with any HDR10 compliant display OR projector.
In my case with the x990... my setup is the x800m2 -> Vertex -> x990. I set up the x990 with my best st2084 tone map, which is either my ChadB normal or bright custom curve, making it ready to receive the HDR PQ10 signal. With Chad curves active, I then use a DM HDR10 White Clipping pattern to increase Master Contrast on the x990, so that the projector just resolves the 712 bar, just below 1000 nits. This allows me to increase my master contrast from a normal +2 to +12, which significantly increases peak white lumens, while retaining white highlights of the DV and HDR10 content I have tested so far.
The caveat... my ability to increase peak white lumens, is limited to the point where I will actually begin to crush white highlights. I figure my setup with LLDV at +12 master contrast, is similar to the UB820 with the Dynamic Luminance slider at +6, which honestly is enough. I'd also note, while leaving master contrast set at +12 is working with most titles, this process still benefits from some hands on tweaking for some titles, but the tweaking is available and does work, and is not very different compared to adjusting the dynamic luminance slider on the ub820.
I'd note, for any content where the MaxCLL is below 1000 nits, the master contrast can be pushed even further, still preserving white highlights while further increasing peak white lumens.
I'd also note, the x800m2 in DV/LLDV mode, is remapping source content to a 1000nit MaxCCL, not unlike what the ub820 optimizer is doing, while preserving higher nit highlights. This remap is right in the ball park of the x990 st2084 controls and custom curve range.
Bottom line... the image quality using the LLDV hack, is superior to the best I can get with the ub820. The thread linked in my sig, or posted by sky, givens some observation examples.
I may upgrade to the Vertex2 or Diva, just to have access to some of the LLDV macro features missing on the Vertex.