When I have Audio output setuped to the 2.0, AAC multichannel (tested 2.1, 7.1) doesnt work as multichannel on passthrough. AVR shows and play it like stereo. DTS/DD etc. works fine, when passthrough, which is expected behauviour (output settings shouldnt matter when passthrough).
When I setuped Audio output to the 5.1, AAC multichannel works in both passthrough/decode (and AVR shows PCM).
For the record, AVR is Pioneer VSX-930 and it knows AAC by specifications.
But anyway, then would make sense to differentiate AAC and rest of DD/DTS…, and make option passthrough avaible only for audio streams, which are in fact possible to send through passthrough.
I will adress this to the Kodi community anyway, I understand this is offtopic here. Main thing is that workaround exists (switch temporarily to decode, for those whose prefer passthrough in other cases)
AAC is not possible to passthrough, so Enable passthrough option doesnt have affect on this particular codec. So even when I have “passthrough enabled”, it doesnt means all audio goes passthrough (not as I though: global passthrough), but only supported audio goes passthrough. Guessing that supported codecs are those, who have option in Passthrough settings… (?)
Because that AAC just got decode all times, and when I setuped 2.0/5.1 pass/not pass? Just guessing, as I think when I enabled 5.1 output and use 7.1 AAC, AVR shows PCM, and shows it gets 8 channels (not practical problem, as AVR has setuped correct number of speakers connected, but worth mention/question this)