Posts: 45
Threads: 9
Joined: Sep 2020
Reputation:
0
Hello,
when opening DSD128
with Eq turned on,
it displays a message:
MPD Error
Failed to open "ALSA Default" (alsa);
Error opening ALSA device
"_audioout"; snd_pwn_hw_params()
failed: Invalid argument
DSD64 and other hires files working well
HW is Pi-3B+ 1.3 + Dac hat is hifiberry dac+ pro
Posts: 13,066
Threads: 293
Joined: Mar 2018
Reputation:
522
I assume you mean the graphic EQ. IIRC its limited to 192K rate.
Posts: 45
Threads: 9
Joined: Sep 2020
Reputation:
0
This limitation applies also to camilla DSP ?
Posts: 5,875
Threads: 173
Joined: Apr 2018
Reputation:
228
Um, how can digital equalization be applied to DSD source material without first converting it to PCM?
Posts: 13,066
Threads: 293
Joined: Mar 2018
Reputation:
522
I ran a few quick tests with my Revolution USB DAC and no issues playing DSD128 with EQ on but when I tested with my Katana I2S DAC I was able to repro the ALSA error.
DSD64 (176.4 PCM rate) plays fine though which suggests some sort of issue in the audio pipeline when EQ is on and 352.8K PCM rate is attempted which is what DSD128 is converted to when the DAC doesn't support native DSD or DoP.
Posts: 13,066
Threads: 293
Joined: Mar 2018
Reputation:
522
I suppose it would be worth trying to set MPD to SoX resample at 352.8K or 384K to see if that avoids the apparent downstream issue in the pipeline.