[davenuc]

Hi, I'm trying to get 4k working on my new projector. When I select Resolution as 3840x2160p in System-> Settings the skin scales perfectly to fill my 16:9 screen as I would expect. However when I play a move the movie image is being squashed with black bars left and right. If I pull up the Interface whilst it's playing the UI fills the width of the screen perfectly with the movie in the background not filling the full width.

Repeat the same thing with a Resolution of 1920x1080p and everything is fine.

I'm using OpenELEC 4.21

Any ideas ?

Did you make a screen calibration for each resolution and refresh rates ?
I guess you made it only for the UI refresh rate. You have to change manually your refresh rate according the one you use for movie and do the screen calibration.

I'm not sure why I would need to change the calibration or frame rate. 3840x2160 is exactly 2x 1920x1080p, it's the standard resolution for UHD. No scaling should be necessary I wouldn't have thought.

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Aren't you always better removing the need for calibration (and the quality loss through scaling this will introduce?) by getting your display set-up correctly? I think calibration is only really there for people who have TVs which have permanent overscan or I guess for some odd ball projector situations?

I agree. My display handles 3840x2160, and the UI scales to this perfectly. But the video seems to be getting confused over the dimensions of the display.