VP 13 - I am rendering using Main Concept AVC/mp4 - 1920x1080 24p Pixel ratio 1.000. My source footage in this case is from a Nikon D850 and Z50 shot in 3840x2160. There's looks to be a 5-10 pixel black bar at the bottom only of the YouTube video. I don't see it when viewing the rendered video on my computer using Windows Media Player. I also don't seem to have the same issue with similar material rendered at 2560x1440 or higher and uploaded to YouTube.