Here are my test results using the sample files from…
https://www.makemkv.com/download/dvtest/
System Config:
Server Version: 1.21.1.3876
Player Version: Plex for Android TV 8.11.0.22186
Client OS: Android TV 9 on NVidia Shield 2019 Pro 16GB version 8.2.1 (Ethernet Wired 1Gbps)
Client OS: Android TV 9 on Sony Bravia XH950 / X950H version 649601 (Wireless AC LAN Connected at 780Mbps average)
Server OS: Windows Server 2012 R2 Std on HP ProLiant ML350 G6 / Dual Xeon X5675 (Dual 1Gbps Teamed LAN)
AVR: Denon AVC-X6700H (Ethernet Wired - Denon restricts this port to 100Mbps)
NVidia Shield → HDMI → Denon AVC-X6700H → HDMI (eARC Port) → Sony XH950 (eARC Port)
Sony XH950 HDMI Setup = Settings → WatchingTV → External inputs → HDMI Signal Format
All HDMI ports are set to “Enhanced Format”
Sony XH950 Audio Setup = Settings → Display & Sound → Audio Output
Speakers = “Audio System”
Audio system prioritisaion = ON
Sound Sync Mode = ON
A/V Sync = Auto
eARC mode = Auto
Digital audio out = Auto 2
Dolby Digital Plus output = Dolby Digital Plus
Pass through mode = auto
Denon AVC-X6700H HDMI Setup = Setup Menu → Video → HDMI Setup
HDMI Control = ON
ARC = ON
Denon AVC-X6700H Output Settings = Setup Menu → Video → Output Settings
Video Conversion = ON
i/p Scaler = OFF
Denon AVC-X6700H 4K/8K Signal Format = Setup Menu → Video → 4K/8K Signal Format = 8K Enhanced
NVidia Sheild Settings:
Device Preferences → Display & Sound → Resolution = 4K 59.940 Hz Dolby Vision and HDR10 Ready
Device Preferences → Display & Sound → Dolby Vision = ON
Device Preferences → Display & Sound → Advanced display settings → Match content colour space = ON
Device Preferences → Display & Sound → Advanced sound settings → Audop Output = HDMI
Device Preferences → Display & Sound → Advanced sound settings → Dolby audio processing = ON
Device Preferences → Display & Sound → Advanced sound settings → Select formats → Manual Selection - all formats ON
P4_LG_Dolby_Trailer_4K_Demo.mkv :
Sony XH950 Internal Plex app:
Direct Plays, but doesn’t state HDR playback on the Dashboard or in Tautulli.
Doesn’t trigger HDR playback symbol in Plex client next to 4K symbol.
Doesn’t trigger DV or HDR on TV - CONSISTENTLY DOESN’T WORK.
Colours look OK, but certainly not HDR.
NVidia Shield 2019 Pro Plex app:
Direct Plays, but doesn’t state HDR playback on the Dashboard or in Tautulli.
Doesn’t trigger HDR playback symbol in Plex client next to 4K symbol.
ONLY triggers DV approx 40% of play attempts, and when it doesn’t trigger DV, it also doesn’t fall back to HDR10 - CONSISTENTLY INCONSISTENT.
Colours definitely look improved over the TV Internal app when DV is triggered.
P5_Dolby_Amaze.mkv :
Sony XH950 Internal Plex app:
Direct Plays, but doesn’t state HDR playback on the Dashboard or in Tautulli.
Doesn’t trigger HDR playback symbol in Plex client next to 4K symbol.
Successfully triggers DV on TV - WORKS CONSISTENTLY.
Successfully triggers Dolby Atmos on AVR.
Colours look great.
NVidia Shield 2019 Pro Plex App:
Direct Plays, but doesn’t state HDR playback on the Dashboard or in Tautulli.
Doesn’t trigger HDR playback symbol in Plex client next to 4K symbol.
Successfully triggers DV on TV - WORKS CONSISTENTLY.
Successfully triggers Dolby Atmos on AVR.
Colours look great.
P7_FEL_GIJoe_The_Rise_of_Cobra.mkv :
Sony XH950 Internal Plex app:
Direct Plays, and states HDR playback on the Dashboard and in Tautulli.
Successfully triggers HDR playback symbol in Plex client next to 4K symbol.
Doesn’t trigger DV on TV, but does trigger HDR on TV - DOESN’T WORK, but falls back to HDR10.
The Dashboard and Tautulli states Direct Play of DTS-HD MA 5.1 audio, but AVR states it is only receiving DTS, not DTS-HD. Likely it is playing the DTS Core layer.
Colours look fine.
NVidia Shield 2019 Pro Plex App:
Direct Plays, states HDR playback on the Dashboard and in Tautulli.
Successfully triggers HDR playback symbol in Plex client next to 4K symbol.
50% of the time, successfully triggers DV on TV, other 50% of the time, falls back to HDR10 - Status always the same on Dashboard, Tautulli and Plex client regardless - CONSISTENTLY INCONSISTENT.
Successfully passes through DTS-HD MA 5.1 on AVR.
Colours look fine when falls back to HDR10, but definitely look better when it does trigger DV.
P7_MEL_GIJoe_The_Rise_of_Cobra.mkv :
Sony XH950 Internal Plex app:
Direct Plays, states HDR playback on the Dashboard and in Tautulli.
Successfully triggers HDR playback symbol in Plex client next to 4K symbol.
Successfully triggers DV on TV - WORKS CONSISTENTLY.
Colours look great.
NVidia Shield 2019 Pro Plex App:
Direct Plays, states HDR playback on the Dashboard and in Tautulli.
Successfully triggers HDR Playback Symbol in Plex Client next to 4K Symbol.
50% of the time, successfully triggers DV on TV, other 50% of the time, falls back to HDR10 - Status always the same on Dashboard, Tautulli and Plex client regardless - CONSISTENTLY INCONSISTENT.
Colours look fine, but definitely look better when it does trigger DV.
P81_GlassBlowing2_3840x2160@59_94fps_15200kbps.mkv :
Sony XH950 Internal Plex app:
Direct Plays, states HDR playback on the Dashboard or in Tautulli.
Successfully triggers HDR playback symbol in Plex client next to 4K symbol.
Successfully triggers DV on TV - WORKS CONSISTENTLY.
Colours look great.
NVidia Shield 2019 Pro Plex App:
Direct Plays, states HDR playback on the Dashboard or in Tautulli.
Successfully triggers HDR playback symbol in Plex client next to 4K symbol.
Successfully triggers DV on TV - WORKS CONSISTENTLY.
Colours look great.
Summary:
The Sony XH950 seems to support DV Profiles 5, 7 MEL and 8.
With Profile 7 FEL, it falls back to HDR10.
It doesn’t support Profile 4 and also doesn’t fall back to HDR10.
I’m surprised about the inconsistent DV triggering of Profile 7 files on the NVidia Shield. Is this because of the Sony TV, or inspite of it, even though the TV internal app plays Profile 7 MEL correctly every time?
NOTES:
The Denon AVC-X6700H Video Conversion setting seems to have no bearing on the above results. I retested with the setting on and off and found no differences whatsoever.
This setting “Automatically converts video input signals to the proper monitor output format”
If you turn it off it “Disables conversion of non-HDMI sources to the HDMI output. NOTE: In this mode the AVR can not display the on-screen graphics over the top of the video signal” - I tend to leave it on for convenience.
Hope all this helps. It took bloody hours to test and collate lol 
