On a computer, a pixel is a square. On a TV a pixel is a rectange with a different height to its width. I think the deal is that NSTC TVs have pixels which are 0.9 times as wide as they are high and I think PAL pixels are wider than they are high but I don't remember the exact dimensions. I don't understand what you mean by "round output" but on a PAL TV, 720 by 576 actually is a 16:9 ratio because the pixels are wider than they are high, whereas on a computer where the pixels are square, 1024 by 576 is a 16:9 ratio. So if you take a 1024x576 render and squash it down to 720x576 then it will look horizontally squashed on your computer but when you put it on a DVD and show it on a 16:9 PAL TV it will look normal.

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