LG CX, SONOS arc: PC audio is randomly recognize as WMA and randomly as Dolby Atmos

[Riccardo]

Hello to everyone, 

I am new to the forum. I wanted to ask whether I am alone with this problem or it is common.

My set up: PC-DolbAtmos, LG-CX, SONOS ARC (eARC).

I've notice the audio connection between the PC and LG+ARC was unstable. Finally I noticed LG-CX sometimes forward (passthrough) the good Dolby Atmos signal and some other times it passes a signal which is WMA (not supported by the sonos device).

PC is set to always send "Atmos", when WMA is sent, simply changing "passthrough->PCM->Passthrough" in the LG audio menu solves the problem.

Why is know that LG-CX randomly passes the good signal at times and at other times doesn't ?

Would you have any tricks to help out ? maybe force audio to be transcoded by the TV (possible?) to be alway DD+ ?

 

Thanks a lot for any kind of help and suggestions.