g-force said:

One thing to keep in mind is that the Anti-Aliasing filter is a line doubler. You MUST resize afterwards unless you want an image that is stretched vertically.

Ah! That explains why the vertical height was doubled when I took the resize out! Now I understand why the resize is there, everything is good.

g-force said: Yeah, one could argue that your TV won't display the edges anyway due to overscan... But not everyone is watching these on a TV. No harm done just blacking out what you don't want and what the TV doesn't show anyway, right?

No harm at all! :-) Was the resizing done in a NAB aware way though? You are of course right that not everyone watches on a TV, but to me that makes 704x480 even more appealing, as you will see no pillarboxing on a PC or a TV as long as both are set right. It is this line I do not understand:

Spline16Resize(728,388).Crop(8,14,-6,-10,align=true).AddBorders(3,58,3,58)

As to which resizer is in the script, it does not matter, as people can change it to whatever they want anyway.