If this the last log is a log where it works successfully, then I am not sure of the issue:
15:15:12 T:140206484420352 DEBUG: CAESinkALSA::InitializeHW - Request: periodSize 2048, bufferSize 8192
15:15:12 T:140206484420352 DEBUG: CAESinkALSA::InitializeHW - Got: periodSize 2048, bufferSize 8192
15:15:12 T:140206484420352 DEBUG: CAESinkALSA::InitializeHW - Setting timeout to 186 ms
15:15:12 T:140206484420352 DEBUG: CAESinkALSA::GetChannelLayout - Input Channel Count: 2 Output Channel Count: 2
15:15:12 T:140206484420352 DEBUG: CAESinkALSA::GetChannelLayout - Requested Layout: FL,FR
15:15:12 T:140206484420352 DEBUG: CAESinkALSA::GetChannelLayout - Got Layout: FL,FR (ALSA: FL FR)
15:15:12 T:140206484420352 DEBUG: CActiveAESink::OpenSink - ALSA Initialized:
15:15:12 T:140206484420352 DEBUG: Output Device : HDA Intel PCH
15:15:12 T:140206484420352 DEBUG: Sample Rate : 44100
15:15:12 T:140206484420352 DEBUG: Sample Format : AE_FMT_S32NE
15:15:12 T:140206484420352 DEBUG: Channel Count : 2
15:15:12 T:140206484420352 DEBUG: Channel Layout: FL,FR
15:15:12 T:140206484420352 DEBUG: Frames : 2048
15:15:12 T:140206484420352 DEBUG: Frame Samples : 4096
15:15:12 T:140206484420352 DEBUG: Frame Size : 8
As this only shows two channels supported. On this NUC, are you downmixing it to LPCM 5.1 or are you transcoding it to AC3?
Make sure the correct Audio device is selected in Kodi. Sometimes if you select the default device, you only get 2 channels.
I’d check things with aplay -l first.
I will also see if Fritsch (AE guy) is about to look at this post and offer some suggestions.
Thanks
Sam