OpenELEC/Kodi/Plex missing audio on centre channel when playing LPCM / TrueHD at start
I've been annoyed by this long enough to want to find out where it's from and to try to fix it.
I am playing BluRay/HD-DVD MKV rips direct from my local Plex server to a RPi3 running OpenElec (8.0.2) and Plex for Kodi 0.1.2. Old Denon 4308 (I think - I'm at work right now?) but works fine otherwise and always played LPCM from disks directly OK (and decoded TrueHD but that's unrelated)
Whenever a film has an LPCM or TrueHD soundtrack the centre channel always starts silent. As it's Direct Play/Stream I can be confident it's not a PMS issue - but must be in the PCM stream being sent to the amp. If I switch to the AC3 track (when available), play a few seconds, switch back to LPCM/TrueHD and return to playback the issue is resolved and I hear vocals. This is bad when some films only have an LPCM soundtrack - I then have to force a transcode to a lower bitrate to work around the issue.
I have tried most combinations of Kodi audio settings without much luck.
Is this issue most likely in Kodi as opposed to the Plex plugin? Should I try building a different Kodi player instead of OpenElec perhaps?
Looking for hints before spending a ton of time on this.