I’m also seeing the error as described by f0o, although I’m using HDMI rather than optical.
This has started as of updating to latest today.
Relevant (or maybe not relevant, IANAE) settings:
Audio output device: AML-M8AUDIO, HDMI
Channels: 5.1
Output configuration: optimized
Stereo upmix: on
Allow passthrough: on
AC3 capable receiver: on
E-AC3 capable receiver: off
DTS capable receiver: on
TrueHD capable receiver: off
DTS-HD capable receiver: off
DSP: off
Debug logs uploaded here:
https://paste.osmc.tv/ajiwupilew
Please let me know if I can provide more info or test a fix! For now, I’m reverting to 2.1 audio, which works fine.
Thanks,
Alex