Hey guys, im back ! I just tryed Avidemux 2.4 GTK+ And it's simply awesome! I had this mkv h264 with many audiotrack, i opened it in Avidemux 2.4 GTK+ and i sucessfully removed the useless audiotrack and half of the credit to end up with a files smaller and without any quality loss noticable. Many thanks, hope this will help others to burn their 720p mkv movies ! Have a good one ! smash