Aspect Ratio ?

[br4]

I have some MP4 files that do not fill my TV screen completely when viewing (with black bars at the top and bottom), even though their frame sizes are 720 x 1280. Other files, with the same frame sizes, fill the screen so I'm wondering how this can happen and how to correct, if possible, without having to change my TV's display to Zoom, from Normal.

 

[samuria]

The files will be set to 16.9 or set to a cinematic display you may be able to zoom but there set that way to give a wide angle