I saw this here https://www.wilderssecurity.com/showthread.php?p=1892952#post1892952 and I must say it is really fantastic. So far only tried on SL 6. Please test to see if I am right.
I've been using SMPlayer for many moons and UMplayer is a better version with updated ui and some good extras. UMplayer is killer and even better if you use Coreavc with UMP to play those pesky 720p/1080p mkv(s).