[da-anda]

if I turn on in the audio settings PLL adjustment, then everything appears correctly on the display of AV Receiver. It shows PLII C when 2.0 dolby, Dolby Digital when 5.1 dolby. When I disable PLL adjustment it only shows stereo or "multi channel stereo".

PLL adjustment is something PI specific. No idea what's going on in the background. It's possible that @popcornmix added some logic to get the old behavior back, where passthrough audio packages got dropped/duplicated for live streams when AV got async (which could produce audio glitches in certain cases and was one of the reasons PT got disabled for live streams in VideoPlayer AFAIK). So if you disable OMXplayer, everything should work as advertised by me in previous posts. When using OMXplayer, popcornmix has to tell, since it applies some custom logic.