Music Player Daemon

What makes you believe that MPD should be able to play those files?

This is not a MPD response. I have no idea what it is, but apparently, you're not using MPD.
Other than that, read and obey https://www.musicpd.org/help/ (a requirement which you chose to ignore on IRC)

Just use "lsinfo".

No. This must never happen, this must be a bug in Meson. Or a buggy patch applied to Meson by the Yocto-Meson package. Consult Yocto support.

That's wrong. This violates Meson's documentation. How did this illegal value end up there?

See https://mesonbuild.com/Reference-tables ... stem-names

It checks for sqlite and libupnp: Run-time dependency sqlite3 found: YES 3.29.0 Run-time dependency libupnp found: YES 1.8.4 But between those two, it *should* check for libsystemd, but it doesn't. From the meson.build, there is exactly one reason why it would skip that check (and not even print a m...

What does "mpd --version" print?
Does it show libsystemd being detected in the log.configure?

Did you build MPD without libsystemd?

Doesn't seem to do what trick? What is the remaining problem?

I don't think anybody here can help you. This problem has nothing to do with MPD. The kernel has decided that the sound device is gone - maybe because it thinks it has been unplugged. Check the kernel logs for details. Different programs can make a difference if you configured to access the hardware...

Even if it's still experimental - you're welcome to report problems like that Android problem on GitHub.

No. Write bug report.

It's broken, but I don't know why and I have no time to fight with phpBB. I was thinking about shutting the forum down and move all discussions to GitHub. I never wanted a forum, but the guy who demanded one and set it up many years ago is gone. Now everything's up to me. Sigh.

I think archives outside of the database/music_directory are not implemented (properly). Implementing that would be a good idea. Can you write a GitHub issue?

Let's look at this example: search (artist contains "red" ) This is a "search" command with 4 parameters (separated by spaces): "(artist" "contains" "red" ")" This doesn't look right, does it? The filter expression must be exactly one argument (see https://www.musicpd.org/doc/html/protocol.html#filt...

So your instructions above were wrong. They were very specific, but they were wrong. That's not helpful. It's a waste of time. Now we need to start from scratch analyzing your problem.

What was the point of this "Group" setting? Why tell MPD to change the group (and drop all other supplementary groups)? Of course, this is broken.

"mpc play" re-starts playback at whatever song is the current song. This is not the proper way to resume playback after "pause". You can use "mpc toggle" to resume playback properly.

I don't understand. Can you rephrase, and be more specific? Maybe a verbose log would help.

Sorry, I have no idea of PulseAudio. I don't like it, and I can't help with it.