Have read everything on using mp4 with Karaoki.. I have version (.8.6546.25377 Dec 3, 2017) of Karaoki (on windows 10) and have tried 5 times to get the pcdj codec to work. Still crashes and closes on trying to load mp4. No other codecs are installed. I can use windows media player (boring, no key change, tempo, , , ) to do the mp4s but its a pain trying to run 2 programs and it seams mp4 are becoming more popular. Followed all the steps listed above still a no go. Really frustrating. Any help is greatly appreciated.