Maybe I'm completely off here, but as I understood I can get local cover art for my DVD folders (with video_ts content):
Give the image the same name as the DVD folder (I.E. the one you select to start playback in MP). E.G. the following two items are in the same folder.
Inception (DVD folder) and Inception.jpg
Unfortunately I can't get this to work in the grid view. I have for instance Inception.jpg in the same folder as the Inception DVD folder. When I select Inception and MP goes to the detailed movie page, I see the Inception.jpg cover art. So this works as expected.
But: In the grid view itself, Inception shows up as a single "file" where it's picture is the first frame of the movie, instead of Inception.jpg. So in my case as the movie starts with a copyright warning, the "cover art" is a copyright warning.
(btw this is a repost as I think I've posted it in the wrong thread previously)