You may have encountered this nasty problem while watching the movies in some games, well it is very easy to fix. Go to the video misc options and then select the "Unfiltered framebuffer updates" option and the annoying black lines will disappear
from the movies in Symphony of the Night, pretty sure this should work for other games too. Have fun.
Thanks to the guy in this thread:
He gave me a bit of inspiration in trying out a solution. A shame he himself didn't seem to find a solution to it and post it.