# Path to the (permanent) directory that should hold the database and albumart
#db_dir=/var/cache/minidlna
For example on my odroid running Ubuntu I have the line:
db_dir=/media/odroid/USBDrive/CDLibrary/minidlnadb
Thankfully a Pi doesn't need rebooted every few days like a Windows PC so I'll give it a chance.
inotify.c:198: warn: WARNING: Inotify max_user_watches [8192] is low or close to the number of used watches [4949] and I do not have permission to increase this limit. Please do so manually by writing a higher value into /proc/sys/fs/inotify/max_user_watches.