Apple tv and Lg tv's smart app yield same picture quality but nvidia shield tv looks washed out...
Specially pay attention to skin tones... I verified all are tested in same picture settings... I have truned on ultrahd setting for hdr which is working fine.
Nvidia shield: https://imgur.com/a/WpR7H
LG/Apple Tv: https://imgur.com/a/eJtE1
Even truehd via spmc and kodi not working n I verified all settings. While 50 bucks chinese android tv is passing truehd just fine. Seems like there was a bug on packaging IEC packets which is affecting small percentage of sound bar/avr... Support team is not able to resolve it...
Seems like I am going to sell this on ebay now...such a shame for this powerful hardware...
Just wanna jump in and tell you I appreciate that you updated your post with the answers you found.
If everyone did that, it would be a a lot easier for everyone to find answers to their problems.