Hi Chris, > mpd 0.19.18 has a bug which prevents it from playing m4a files. > > This is documented in their bug tracker: > https://bugs.musicpd.org/view.php?id=4564
thanks for the heads up! I wasn't aware this is a run-time issue that affects the version currently in Debian. I'll upload 0.19.19-1 tonight. Florian