If I play a mp4 movie via USB on my Sony Blue Ray the aspect ratio is "theater like"....there is a black stripe about 25% of the top and bottom of the screen.
When I play the same movie via PlayOn the aspect ratio is changed to "full screen"....and objects looked "pulled" / lengthened.
I tried transcoding on / off...
I can't find a setting in PlayOn that sets / changes the aspect ratio.