echo 65536 > /proc/sys/fs/inotify/max_user_watches

systemctl restart minidlna

systemctl status minidlna

root@raspberrypi:/var/log/minidlna# echo 65536 > /proc/sys/fs/inotify/max_user_watches
root@raspberrypi:/var/log/minidlna# systemctl restart minidlna
root@raspberrypi:/var/log/minidlna# systemctl status minidlna
● minidlna.service - MiniDLNA lightweight DLNA/UPnP-AV server
  Loaded: loaded (/lib/systemd/system/minidlna.service; enabled; vendor preset: enabled)
  Active: failed (Result: exit-code) since Sat 2021-06-05 23:03:26 +09; 8s ago
    Docs: man:minidlnad(1)
          man:minidlna.conf(5)
 Process: 21306 ExecStart=/usr/sbin/minidlnad -f $CONFIGFILE -P /run/minidlna/minidlna.pid $DAEMON_OPTS (code=exited, status=0/SUCCESS)
Main PID: 21307 (code=exited, status=255/EXCEPTION)

июн 05 23:03:25 raspberrypi systemd[1]: Starting MiniDLNA lightweight DLNA/UPnP-AV server...
июн 05 23:03:26 raspberrypi systemd[1]: Started MiniDLNA lightweight DLNA/UPnP-AV server.
июн 05 23:03:26 raspberrypi systemd[1]: minidlna.service: Main process exited, code=exited, status=255/EXCEPTION
июн 05 23:03:26 raspberrypi systemd[1]: minidlna.service: Failed with result 'exit-code'.

тогда ещё раз лог покажи

root@raspberrypi:/var/log/minidlna# cat minidlna.log
[2021/06/05 20:17:29] minidlna.c:1060: warn: Starting MiniDLNA version 1.2.1.
[2021/06/05 20:17:29] minidlna.c:355: warn: Creating new database at /var/cache/minidlna/files.db
[2021/06/05 20:17:29] minidlna.c:1101: warn: HTTP listening on port 8200
[2021/06/05 20:17:29] scanner.c:730: warn: Сканирование /var/lib/minidlna
[2021/06/05 20:17:29] scanner.c:819: warn: Сканирование /var/lib/minidlna завершено (0 файлов)!
[2021/06/05 20:17:29] playlist.c:135: warn: Parsing playlists...
[2021/06/05 20:17:29] playlist.c:269: warn: Finished parsing playlists.
[2021/06/05 20:17:30] monitor.c:218: warn: WARNING: Inotify max_user_watches [8192] is low or close to the number of used watches [2] 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.
[2021/06/05 20:22:36] minidlna.c:155: warn: received signal 15, good-bye
[2021/06/05 20:22:36] minidlna.c:1060: warn: Starting MiniDLNA version 1.2.1.
[2021/06/05 20:22:36] minidlna.c:292: fatal: ERROR: Failed to open sqlite database!  Exiting...
[2021/06/05 20:25:39] minidlna.c:1060: warn: Starting MiniDLNA version 1.2.1.
[2021/06/05 20:25:39] minidlna.c:292: fatal: ERROR: Failed to open sqlite database!  Exiting...
[2021/06/05 22:35:26] minidlna.c:1060: warn: Starting MiniDLNA version 1.2.1.
[2021/06/05 22:35:26] minidlna.c:292: fatal: ERROR: Failed to open sqlite database!  Exiting...
[2021/06/05 23:03:26] minidlna.c:1060: warn: Starting MiniDLNA version 1.2.1.
[2021/06/05 23:03:26] minidlna.c:292: fatal: ERROR: Failed to open sqlite database!  Exiting...

а можешь вписать в /etc/sysctl.conf fs.inotify.max_user_watches=65535 и ребутнуться?

потом посмотреть cat  /proc/sys/fs/inotify/max_user_watches

да базу же не может создать

сделал

root@raspberrypi:/home/pi# cat /proc/sys/fs/inotify/max_user_watches
65535
root@raspberrypi:/home/pi#

ага.. ну и по базе - папка /var/lib/minidlna

chmod -R 777 /var/lib/minidlna

systemctl restart minidlna

systemctl status minidlna

Не понял

это я обозначил где она находится

root@raspberrypi:/home/pi# systemctl status minidlna
● minidlna.service - MiniDLNA lightweight DLNA/UPnP-AV server
  Loaded: loaded (/lib/systemd/system/minidlna.service; enabled; vendor preset: enabled)
  Active: active (running) since Sat 2021-06-05 23:25:54 +09; 9s ago
    Docs: man:minidlnad(1)
          man:minidlna.conf(5)
 Process: 6124 ExecStart=/usr/sbin/minidlnad -f $CONFIGFILE -P /run/minidlna/minidlna.pid $DAEMON_OPTS (code=exited, status=0/SUCCESS)
Main PID: 6131 (minidlnad)
   Tasks: 2 (limit: 4915)
  CGroup: /system.slice/minidlna.service
          └─6131 /usr/sbin/minidlnad -f /etc/minidlna.conf -P /run/minidlna/minidlna.pid -r

июн 05 23:25:54 raspberrypi systemd[1]: Starting MiniDLNA lightweight DLNA/UPnP-AV server...
июн 05 23:25:54 raspberrypi systemd[1]: Started MiniDLNA lightweight DLNA/UPnP-AV server.

@andrey_sea можно для чайников, в чем была проблема?

1) ограничение на слежение для файлов; 2) не было доступа к папке с базой данных