I’m having the same issue that Clockkent has described. I’ve searched other threads and although there’s a lot of discussion about HD audio formats and the Vero 4k etc, I’ve not managed to find any suggestions that fix it for me as yet. Clockkent’s description is the closest to what I’m experiencing that I can find, so chiming in here.
Before the 2018.03 update, I was able to play Atmos and DTS-HD MA tracks consistently, without problems. However, now it appears to be touch and go as to whether I will get any sound from those video files.
Another thing I’ve noticed is that I can sometimes work around it…
If I start playback and get no sound, then skip forward 5 mins into the file so kodi marks the file as ‘in progress’. Then if I ‘resume’ playback from that point of the video file, skip back to the start of the file and let it play, it is more likely to then produce the audio. (Still some cases where it doesn’t produce sound at all even using this workaround.)
Only started happening recently.
When this happens and I bring up the OSD for the amp to see what it’s receiving it seems to not be able to identify an audio track. Whereas, when I do get sound for these files it will correctly display Atmos / DTS-HD MA.
And if I disable Atmos/DTS-HD passthrough in kodi, I do get PCM audio.
I’ve got a Denon AVR-X2200W, which did have a firmware update a while ago, but I can’t remember exactly when. It’s currently on firmware: 4200-2411-4032, DTS version: 3.90.50.00
And my Vero 4k is up to date as of an update it got today: 2018.03-2