[averylinden]

I couldn’t get Kodi to output Atmos to my LG C9 even the TV supports Atmos on the Shield from Plex, Netflix etc, as soon as I plugged the Shield into my Denon Kodi started outputting Atmos, I think maybe Kodi doesn’t output Atmos unless your TV / Soundbar edid reports TrueHD compatible.   

I don't have any problems with Kodi and Atmos (lossy or lossless) on a Shield 2019 attached directly to an LG C9 (playing local content).    

Hi, so if connected directly to the C9 and you play a movie from Kodi with TrueHD Atmos, The Dolby Atmos banner displays on the TV screen?    

Yes, I have a couple of UHD disc rips that I made. I get the HDR and Atmos banner when they play. I haven't done anything special to the config except allow passthrough of the audio formats that the C9 supports. Happy to provide any other info needed. Here is an example of one of the files.

Code:

Audio #1
ID                                       : 2
Format                                   : TrueHD
Format profile                           : TrueHD+Atmos / TrueHD
Codec ID                                 : A_TRUEHD
Duration                                 : 1 h 55 min
Bit rate mode                            : Variable
Bit rate                                 : 4 062 kb/s
Maximum bit rate                         : 7 278 kb/s
Channel(s)                               : Object Based / 8 channels
Channel positions                        : Object Based / Front: L C R, Side: L R, Back: L R, LFE
Sampling rate                            :  / 48.0 kHz
Frame rate                               : 1 200.000 FPS (40 SPF)
Compression mode                         : Lossless
Stream size                              : 3.26 GiB (8%)
Title                                    : Surround 7.1
Language                                 : English
Default                                  : Yes
Forced                                   : No