AviSource("desmumesource.avi")
screens = last
upperScreen = Crop(0,0,256,192)
lowerScreen = Crop(0,192,256,192)
#miniScreens = screens.LanczosResize(128,192)

lowerScreen.PointResize(512,384).StackHorizontal(screens)
LanczosResize(512,256)
#ConvertToYV12()