Gstreamer handles video top-down, but Windows's dshow handles it
bottom-up. So let's insert a videoflip filter to fix the discrepancy
instead of relying on videorenderer to flip it like we did before.
Signed-off-by: Andrew Eikum <aeikum@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>