When using the --win command to get one video synced on 4 monitors I get an error:
pi@iptv-a5 ~ $ omxplayer-sync -muv synctest.mp4 --win 0,0,3840,2160
WARNING: dbus connection could not be established
org.freedesktop.DBus.Error.ServiceUnknown: The name org.mpris.MediaPlayer2.omxplayer was not provided by any .service files
WARNING: omxplayer did not start. Try to test with `omxplayer -s OPTIONS`
When using the --win command to get one video synced on 4 monitors I get an error: