I am comming back to this topic because I encountered problems again. I am watching the series NYPD blue. The first series I ripped February 2016 with
libmakemkv v1.9.9 (1.3.3/1.4.4) x86_64-linux-gnu
The second series I ripped November 2016 with
libmakemkv v1.10.2 (1.3.3/1.4.4) x86_64-linux-gnu
I checked both files with ffprobe and the audios are both
Stream #0:1(eng): Audio: ac3, 48000 Hz, 4.0, fltp, 448 kb/s (default)
I am watching this over a Samsung TV which is connected to my Open-Media-Vault server NAS. The streaming application is the plugin "mini DLNA". Then there is a Marantz 5.1 Receiver which gets the signal from the TV-out.
The first season is fine in 5.1
The second season I cannot watch in 5.1 because all background noises are too loud and the center voices lack high frequencies. So, I watch it just over the TV in stereo.
This is an different problem than the previously encountered sound issue with the constant back and forth panning.
But, what strikes me is that I have absolutely no problem with any DVD I ripped with v1.9 and I do have several problems with v1.10. I am no expert but I really suspect that there might be a problem here.
Another option would be that my Samsung TVs Smart Hub (the application that connects to all DLNA servers) was updated since then several times.
However, I have the feeling that this is related to the update of the makeMKV library.
EDIT: I don't convert to flac, I just pass through and it is all AC3, also the ones that make no problem.