ok, guys. I did some extended testing:
hardware: Ugoos AM6b+, Sony A95L (2023 QDOLED)
software: latest CE 20.5 nightly 20240326
options: cd/cs auto; no whitelist
I tried two testfiles (fileinfo read via mediainfo):
Testfile 1: 3840x2160, 23,976, HDR, 4:2:0, 10 Bit File (UHD Movie Remux)
Testfile 2: 1920x1080, 23,976, SDR, 4:2:0, 8 Bit File (F-HD Movie Remux)
here are my findings:
first of all, I can repoduce the wrong color bug only on the first try after a restart. If I do a second try, the file plays fine.
Testfile 1 (UHD movie):
GUI set to 1920x1080, 60: wrong colors on the first play, second try works, TV receives the following informations on both tries: 3840x2160, 24, BT2020, YUV 4:4:4, 12 bit
GUI set to 3840x2160, 60: wrong colors on the first try, second try plays fine, TV receives the following informations on both tries: 3840x2160, 24, BT2020, YUV 4:4:4, 12 bit
GUI set to 3840x2160, 23,98: playback is fine on both tries, TV receives the following informations on both tries: 3840x2160, 24, BT2020, YUV 4:4:4, 12 bit
Testfile 2 (FHD Movie):
This file plays fine on all three GUI settings. TV receives 3840x2160, 23,98, BT709, YUV 4:4:4 12 Bit if the GUI is set to UHD resoltion and 1920x1080, 23,98, BT709, YUV 4:4:4, 12 Bit if the GUI is set to FHD resolution.
to sum up:
only the UHD file makes problems and only on the first playback after a fresh start of the box. with GUI set to 3840x2160, 23,98 it always plays fine.
my question is: why does the TV receive a 4:4:4 12 bit signal during playback of the FHD movie? shouldn’t it get the native 4:2:0 of the file with 10 bit color?
Edit: I will do the same testings with 21 nightly later