You seem to have the rest of a compilation of MLT in your last output_debug : rc libmlt4 0.7.6+git20120204-2 multimedia framework (runtime) You should remove it definitively. At first look your problem should come from that. Either you find a way to remove it without remove MLT either you remove MLT (its will remove OS too), check if you have nothing about MLT and reinstall OS and then MLT. Good luck. 2013/10/19 fabrizio