When I play 24 bit, 96KHz tracks in Volumio through the Raspberry Pi HDMI output, I see 48KHz in /proc/asound/card0/pcm0p/sub0/hw_params.
Shouldn’t HDMI be able to play higher sample rates than that, probably even 192KHz?
I have mpd set to not resample.
Unfortunately, Volumio resamples everything to 48kHz when using HDMI output.
Have a look here: hdmi-audio-out-on-raspberry-t307.html