Is there a known issue on RPi4 with multichannel audio playback from recorded HD TV (was recorded from UK Channel 4 HD and adverts snipped)?
I get no sound on the primary channel unless I set the RPi audio output to 2.0 (should be 5.0 for my equipment and the original recording is 5.1).
If not known then I’ll try to find a shareable file and grab logs.