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Unfortunately, it’s not quite that easy: shifting the display four pixels down via xrandr does, indeed, bring back the missing four pixels at the top of the screen… but makes four pixels disappear from the bottom.

To test, make a plain 1280x480 image with a four-pixel border all the way around. View it full-screen in Viewnior. You’ll see the top part of the border missing. Use xrandr to shift the display down. Go back to Viewnior. You’ll see the top part of the border present, but the bottom part now missing.

In either case, you’re missing four rows of pixels: the display only seems able to show 476 vertical pixels, not 480.