Resizing and ITU-R

[FlimsyFeet]

Most of the stuff at http://lipas.uwasa.fi/~f76998/video/conversion/ is way over my head. But if I understand it:

4:3 DVDs are not 1.33:1 but actually 1.37:1
16:9 DVDs are not 1.78:1 but actually 1.82:1

So, for example, when encoding a 4:3 DVD to XviD, and assuming no cropping of the source, it is better to use a resolution of 640x464 instead of 640x480?

[GodofaGap]

If the width of your DVD is 720 and follows ITU then yes. For ideal AR you'd have to resize to 640x468 and then crop to 640x464 for mod16.

[FlimsyFeet]

Personally, I would rather have a slight error in the AR, rather than crop some of the picture, but I see what you're saying.