Thanks. There are lots of threads about this problem. It has been an issue/bug before PR 1.2 so when you start to search you will find many threads with an answer "wait for PR 1.2". So far I have tried tracker-processes -r with and without reboot as well as install --re-install encoders or it was something like that with and without reboot. Also tried uninstalling and reinstalling different players. This situation concerns all of them: Unable to play video. Video format not supported. And I have to be able to watch my linux terminal education videos as well as videos of the folk music accordion plays I need to practise. I just think reflashing is the easiest way. Maybe I start a thread and ask help before that.