Just streamed it through Universal Media Server onto my LG Smart TV.
There were two picture settings, original and full. With original, it was in a small black box in the middle, almost like a non-anamorphic DVD. When I put it on full, it got bigger, but still thin black bars on the left and right of the screen, just like with VLC when I turn on “always fit to window”.
Proof (picture setting on full)
Very minor as you can see, but a little annoying.
The main menu fills my 16:9 monitor perfectly, so I have a feeling it’s to do with the DVD itself.
On VLC, it’s more noticeable.