I've been testing Cub Linux RC1 (based upon Ubuntu 14.04) and had some problems with video playback. After some research I found that editing ~/.config/compton.conf and changing the following lines removed the issue:
Replace backend = "xrender"; with backend = "glx";
Replace vsync = "none"; with vsync = "opengl";
Note: This works fine on the Integrated Intel HD5500 graphics but still produces tearing if I switch to the Radeon Discrete graphics. Not sure if I can find a setting that works with both... Thoughts?