Originally Posted by bmandra
I think I have the calculation to/from nits for the Dolby VSB figured out. If anyone has access to displays that actually support LLDV and could capture and post there strings it would be helpful. I believe the calculation is tmax * 50 + 100, which would put the A1 string at 900 nits. So changing the string to “eb:01:46:d0:00:45:03:28:86:60:76:8f” should be 350nits.
I have about a dozen custom EDIDs to test on my setup tonight to see how far we can go with changing the nits and colorimetry values using either DV v1 or v2 strings. The v1 values are a real pain to calculate so I’m hopeful we can use the v2 ones instead.
On my Sony PJ although I can import curves it doesn’t support uploading of color profiles (although the profiles can be manually adjusted) which I guess means I have to either successfully edit the DV block to match primaries for my HDR calibration or have a new calibration done specifically for LLDV. I think that for the JVC guys just using the A1 color profile Dominic posted should be a good solution. If changing the nits via the string works well then JVC guys are likely all set.
I sent a code sample to HD Fury today on how to decode the Dolby VSB and they said it will be incorporated into a future release for Diva, Maestro, Vertex 2. They are going to see if the devs can do anything on the Integral 2, but memory on that device is pretty limited at this point.
I don't think there are any TV other than Sony that will actually report LLDV capability.
I have attached the DV tab from a Vertex connected to my LG B7A. The B7A will accept LLDV output from my Oppo configured to output Player Led DV and it will report receiving Dolby Vision, but the Oppo will always default to TV led to my B7A.
The Vertex was configured to Automix mode.
Captured DV metadata block:
Dolby Vision Version:1 DM Version:1
Capabilities: [2160p60]: YES
Capabilities: [YUV422 12bit]: NO
Capabilities: [Global Dimming]: NO
Target Max Luminance: 350 nits
Target Min Luminance: 0.063 nits
The NO to 422 12bit would seem to me to indicate that it does not report support for LLDV, even though will accept the LLDV 4K 4:2:2 12-bit signal and recognize it as DV.