I found the solution to this annoying issue.
Use the free photo editing program GIMP
Resize the image to 3840x2160 or anything that is exactly 16:9 aspect ratio
then File -> Export As -> change extension to jpeg or jpg
click Export up quality to 100
Uncheck Save IPTC
Click Advanced Options Uncheck Optimize Uncheck Progressive
Scroll Smoothing to 1.00
click Export
This should resolve the issue