i've just installed the last version of raspian desktop on my new raspberry. I did the update and upgrade and i did a reboot. I installed VLC and i copyed a film .avi in the microsd card in the videos folder. When i double click the file VLC starts but the screen of the program stay black. The audio start but not the video. If i skip and go, for exemple, at the half of the film and image, like a frame, of the film compares but it stay freeze to that frame but the audio still go ahead. How can i resolve this?