Originally Posted by AndreNewman
Thanks for the info, I'm not using Gamma D on the X7000, I have a couple of custom curves loaded but the screen is large so I'm struggling for light, only 80nits at best, 50 for scope, I used to think they were ok until I started using MadVR. So I'm only considering a play with this hack (original meaning) for the odd Netflix show that I can't play through MadVR.
Well and also, I'm a broadcast video Engineer so this stuff is interesting to work out what's really going on.. The last time spoke to Dolby about this at a trade show it sounded like DV was more about locking down the grading tools and making money from the production process in return for a more controlled playback experience.
Sounds to me like the real trick would be to reverse engineer the DV edid such that we can put in our real display capabilities and get the player to tone map to those exactly.
I can't imagine the colour space is really much different, unless there's some mapping to the specific native colour space of a specific TV. If so we need to find the dimmest DV profile 5 capable TV with the most accurate native P3 (or bt2020) colour space and sniff the edid for that.
Everything is a bit busy this week but hoping for a few hours to give this a go next week, for now it's all talk (from me) and really the next step is go try it, see what happens.
I do have a friendly home cinema and TV supplier so going through all their showroom stock sniffing edids might be a possibility.
Thanks for all the pointers.
Again, apologies for making the gamma D assumption - so yes, with a bright curve this hack is worth investigating, if only for curiosity.
Going back to conversations much earlier in the thread, it'd be very interesting to see other Dolby VSVD blocks and how that affects picture.
One thing I'd not considered is that so far only LLDV specific blocks, ie from the Sony A1 (and one other I've found - different block, again a Sony but bytes 5 & 6 different), have been discussed.
Since devices such as the ATV or Shield are obviously restricted to outputting Profile 5 only, if follows that the EDID used to spoof that need not be Profile 5 specific which opens the playing field up a bit. Actually - I'll clarify that - EDIDs for TVs that support both profile 7 AND profile 5, not just profile 5 (no good for those using DV BluRay players obviously..)
As you say, if we can reverse engineer the Dolby VSVD whether LLDV specific or not, that will provide a lot more information - firstly I'd love to know the full spec of the Dolby VSVD block but failing that, I'd love to know how far HDFury have got in decoding it - I think they know more than they're willing to let on
One thing I will say - I've experimented with streaming LLDV from Netflix on a Shield Pro to the 7000, fiddling with BT.2020 primaries and my own curves and I much prefer to stick to the standard LDR Rec.709 graded streams. It also means no resyncs which has to be considered a good thing with a JVC!!
Zidoo Z9S | Nvidia Shield Pro | HDFury Vertex² | 32TB mirrored storage
Denon AVC-X8500H | JVC DLA X7000 | Screen Research 9ft multi aspect ClearPix 2 ISF screen
3 x PMC IB2S fronts | 4 x PMC Wafer 2 rears | 4 x PMC Wafer 1 ceiling | 2 x M&K SS550 THX height | Rel Stentor III
A pair of slippers, a comfy sofa and a glass of 16 year old single malt