I want to play an avi file as intro for a game during startup. If I play the file at full screen the play stutters and is not smooth even if the resolution is low while if I play it in window mode it plays OK even if I use the highest video mode of 12. Can anyone tell me why?

If I use this:

video_screen = 0;
video_mode = 12;
media_play("Collision.avi",NULL,100);

it plays smooth.

but when I change

video_screen=1;

it stutters.