Yes, there is. In "Advanced settings", in "Resize method" select "add borders". This way, if the movie's aspect ratio is different than the aspect of your player, the movie won't get cropped, but resized proportionally to the specified width, and then expanded vertically with black borders, so it's height is equal to the specified height. Here is an example of the three resize methods:
Pan&Scan:
Keep aspect:
Add borders:
For our RockChip based players, "Keep aspect" does not work, because the movie resolution must be equal to the player resolution.
(these screenshots are from Transformers too
)