Playback issue: Dolby Atmos

[zeustek 1]

I'm posting this if anyone needs a work-around.

I've been having an issue with bitstreaming Dolby Atmos to my Yamaha RX-A8A AVR. If an AC3 or EAC3 stream is encoded with Atmos, the audio cuts out, sometimes often, sometimes periodically (the frequency of cut outs changes with each movie). I didn't notice any issues with Atmos encoded streams in any of the higher bitrate streams (e.g. Dolby True HD 7.1 seems fine). Also, it doesn't seem to matter if I have bitstreaming enabled or not, the audio was cutting out with it off, but without the Atmos decoder on my AVR flipping out, it was just little blips of audio cutting out).

This cropped up after a hardware change (at least I think thats what it is, becuase I don't recall having an issue until I changed out the GPU). Current hardware:

AMD Ryzen 5 5700G, 32GB ram, Radeon 9060XT 16GB (previous graphics card was a GeForce 4060Ti 8GB). I also never had an issue with my main PC hooked up (AMD Ryzen 9 9950X3D, GeForce 4090).

AFAIK the default behaviour for the Windows app is Balanced video decoding. If you change to High Quality, the problem gets significantly worse, changing to Energy Efficient appears to fix the issue.

 

[Mahinepua 82]

High quality uses software decoding energy efficient all hardware, balanced piggy in the middle.

There is a ffmpeg bug with Truehd and atmos that has been fixed with custom mpv builds and will also be incorporated  into the next beta with a bit of luck.