[Mazin]

I am absolutely right, but pixel aspect is not a critical option.

Whatever pixel aspect you have, your animation will still have 720 pixels in a row and 480 pixels in a column.

But, pixels in NTSC TV are not square. They are slightly squished. Setting the pixel aspect will have Max compensate for non-square pixels on a TV. This way, squares turn out square and circles turn out circular, and not rectangular or elliptical.