After someday workaround MPDroid & MALP to fetching cover art automatically. i add "max_output_buffer_size" to mpd.conf and it's work fine.
Only MALP v1.1.12 works on RuneAudio. i don't known why.
Make symbolic link on RuneAudio:
ln -s /mnt/MPD /var/www/covers
Then (Many thanks to
@[deleted] for this tip):
redis-cli hset mpdconf max_output_buffer_size "16384"
Set http files on MPDroid:
http://your_ip/covers
Set http files on MALP:
http://your_ip/covers/%d/folder.jpg
Set http files on Soundirok:
http://your_ip/covers