I have found that if I use the Home Video selection and add a poster, it automatically makes the poster the same shape as TV or movie posters. But sometimes I would like to use something more akin to a YouTube thumbnail. Would be great to not have it cut off the sides of that thumbnail!
I think this is especially useful for home video sections where you won’t necessarily be designing custom poster sized images for every video.
Early 2021 clean-up: duplicate