I am currently having troubles with audio output with Infuse Pro 7 when playing DTS-HD MA 5.1 audio over eARC. The channels are getting mixed up, I get the central speaker coming from the right rear and the rears coming through the sound bar.
This problem does not occur when I switch back to ARC and so far I am only experiencing this issue with Infuse. I have not seen this with Netflix, Plex or Prime.
Here is my current setup with settings:
Apple TV 4K (4th gen)
tvOS 14.7 (18M60)
Infuse Pro 7.0.9 (3759)
Match Content: Range & Frame Rate
Audio Output: Receiver Speakers
Audio Format: Auto, Dolby Atmos On
LG CX 65"
Digital Sound Out: Pass through
HDMI Input Audio Format: Bitstream
Is this happening with other files, or just this one?
This particular file appears to have 3 front channels, and 2 middle channels. This is also known as 5.1(side). When using eARC the channels would be passed as-is, and it sounds like your soundbar may not understand how to handle this layout.
If you have a chance, can you try one of the DTS-HD MA samples found here?
I have/had the same problem. My setup is LG C9 - JBL Bar 9.1.
Had my ATV 4K connected to the tv via eARC - Passthrough, and the things happened the same way as you write. I have now connected ATV 4K to the HDMI In on the soundbar instead, and now the problem is solved. Sound comes in the right speakers.
My point here is - try to connect your ATV 4K directly to your reciever/soundbar and not to the tv.
At least that helped for me
If I wanted to solve the issue I would just go back to the optical cable. I don’t like tones of cables being connected to the sound bar. It is also very inconveinient to jump through the sound outputs. I just want it to work like it does in every other app.