Subj : aplay oddity
To   : All
From : Adrian
Date : Thu Oct 23 2025 19:09:02

Pi3 running Bookworm.

I have a python program that runs continuously, that will when it 
detects an event call aplay to play a short tune.

This has been working fine, until today.  I had to reboot the Pi earlier 
today, and now the python won't play aplay (the python is running as it 
logs when the event happens).

If I do a cut and paste of the aplay command, it works fine.  So the 
problem looks as though it is some thing to do with the python call. 
Both command line and python are running under the same user.

What I'm seeing logged by the python code is the following error :

ALSA lib pcm_dmix.c:999:(snd_pcm_dmix_open) unable to open slave
aplay: main:831 audio open error: Unknown error 524

I've tried rebooting again, and an Internet search doesn't come up with 
anything for my particular problem (they all seem to be "nothing 
working").

Any suggestions on what to hit with the big hammer ?

TIA

Adrian
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