(In reply to comment #4) > Please provide a sample video where this is happening. This one seems to cause the same error as my files (can't upload mine due to copyright restrains): http://www.cccp-project.net/beta/test_files/KAA_fumoffu_old_x264_breaks_lavc.mkv I noticed that the playback sometimes finishes sucessfully if i stop moving the mouse completly, but as soon as i start moving it, the breakage is certain.