well try using a format that doensn't support the alpha channel, like .bmp or .pcx.
You will want something like this...
var video_handle;
bmap render_screen = "the bitmap.bmp";
panel renderer
{
pos_x=0;
pos_y=0;
layer=1;
bmap = render_screen;
flags = visible;
}
function play_on_bmap()
{
video_handle = media_play("movie.avi",render_screen,100);
}
Any errors should be little syntax problems, i haven't used c-script for a long time, lol.