This question seems poor but i really facing this problem (I am new to ubuntu). I install Ubuntu 12.04 on my HP laptop. I also upgraded all its packages using sudo apt-get update && sudo apt-get upgrade. But when I play any video file through media player (default and smplayer), i can only hear audio but no video is seen, screen becomes blanks. All types of video file can be played but only audio can be hear ne video.
Thanks in advance