I know this has been asked before, but I can't find it using Search...
Every once in a while, I'll have a video file that has three light-colored bars at the bottom of the video, probably 1/10th the height of the video. The bars are translucent, and appear to mirror the image from the top of the screen...

Any idea what causes this and how to get rid of it? For this particular video, the bars don't show up in VLC, but do in Plex.
Thanks!
Solution For 3 Bars?