I'm trying to set up a Python process that plays audio to auromatically start on boot with systemd but when I do the audio is full of pops, even though it's fine when I run it myself in the command line. As you can see in my .service file below I've tried maxing out the process priority in every way I can think of. Does anyone know what's going wrong?
The script is here: https://github.com/UndarkAido/superhet (You'll have to populate the music directory and secrets.py yourself to run it. genBreaks.py populates the breaks directory.)
superhet.service:
[Unit]
Description=Superhet radio
After=multi-user.target sound.target
[Service]
Type=simple
CPUSchedulingPolicy=fifo
CPUSchedulingPriority=99
IOSchedulingClass=realtime
IOSchedulingPriority=0
Nice=-20
User=aidan
Group=aidan
WorkingDirectory=/home/-user-/Source/superhet
ExecStart=/home/-user-/Source/superhet/venv/bin/python main.py
[Install]
WantedBy=multi-user.target
System info:
`.::///+:/-. --///+//-:`` -user-@superhet
`+oooooooooooo: `+oooooooooooo: --------------
/oooo++//ooooo: ooooo+//+ooooo. OS: Raspbian GNU/Linux 10 (buster) armv7l
`+ooooooo:-:oo- +o+::/ooooooo: Host: Raspberry Pi 4 Model B Rev 1.1
`:oooooooo+`` `.oooooooo+- Kernel: 5.10.63-v7l+
`:++ooo/. :+ooo+/.` Uptime: 20 mins
...` `.----.` ``.. Packages: 1485 (dpkg)
.::::-``:::::::::.`-:::-` Shell: bash 5.0.3
-:::-` .:::::::-` `-:::- Terminal: /dev/pts/0
`::. `.--.` `` `.---.``.::` CPU: BCM2711 (4) @ 1.500GHz
.::::::::` -::::::::` ` Memory: 89MiB / 1872MiB
.::` .:::::::::- `::::::::::``::.
-:::` ::::::::::. ::::::::::.`:::-
:::: -::::::::. `-:::::::: ::::
-::- .-:::-.``....``.-::-. -::-
.. `` .::::::::. `..`..
-:::-` -::::::::::` .:::::`
:::::::` -::::::::::` :::::::.
.::::::: -::::::::. ::::::::
`-:::::` ..--.` ::::::.
`...` `...--..` `...`
.::::::::::
`.-::::-`
Edit: systemctl status superhet.service also shows superhet python[1040]: ALSA lib pcm.c:8424:(snd_pcm_recover) underrun occurred periodically
