2020-12-27, 18:08
The logic is the following: If you tell kodi that you only have 2 real PCM channels (see that this speaker layout is in the PCM settings, not passthrough), kodi learns from this, that it has to take action to "output more than 2 channels" on your hardware. So what does it do:
DTS, AC3 and EAC3 are "encoded formats" in comparison to raw PCM, they "hide" up to 7.1 channels (E-AC3) in themselves. Normally kodi would just "decode" them and output them as LPCM (5.1. or 7.1 or whatever), but as you only have 2 pcm channels, kodi will decode these and "transcode" them to AC3, which again is transmitted via 2 PCM channels, but internall "hiding" up to 6 channels, which the AVR then will decode out of these streams.
DTS, AC3 and EAC3 are "encoded formats" in comparison to raw PCM, they "hide" up to 7.1 channels (E-AC3) in themselves. Normally kodi would just "decode" them and output them as LPCM (5.1. or 7.1 or whatever), but as you only have 2 pcm channels, kodi will decode these and "transcode" them to AC3, which again is transmitted via 2 PCM channels, but internall "hiding" up to 6 channels, which the AVR then will decode out of these streams.