2018-05-31, 21:53
(2018-05-31, 19:53)hdmkv Wrote: Anyone using an Optoma 4K projector with Shield? Preferably UHD50 or the new UHD51A? I recently got the latter, and can’t get 10 or 12-bit output out of Kodi (using v18 Alpha 1) and 23.976 or 24.000. With 4K@60 HDR (like the Sony Camp demo clip), I get 10-bit 4:2:0. But, with 23.976, it’s always 8-bit 4:2:2.Shield only supports Deep Color at 4K 50/60Hz (10-bit 4:2:0). At lower refresh rates it is 8-bit 4:4:4 for Rec. 709 or 12-bit 4:2:2 for Rec. 2020. The 8-bit that you are seeing on your projector or AVR is unlikely to be true. There are very few devices that can accurately detect the bit depth of 4:2:2 signal. Most of them display 8-bit (including some HDMI analyzers and HD Fury Vertex).
With Zidoo X9S and new X20, with 23.976, I get 4:4:4 12-bit as expected. Can’t figure out why Shield won’t do same?
If you do want to confirm whether your projector is treating the signal as 8-bit or 12 (10)-bit, check it out with one of the 2DQuants Quants2D test pattern that I mentioned in my previous post. If the signal is being processed as 10/12-bit 4:2:2, you should see something like in this picture- https://imgur.com/wqAlDRk . You will see 4 block wide bands, if it is processed as 8-bit as you can see in the preview below:
