[MEncoder-users] Please help: Scale, expand and aspect

[Martin Collins]

On Sat, 08 Jul 2006 23:22:15 +0200
Magnus Karlsson <magnus.m.karlsson at spray.se> wrote:

> "-vf scale="720:432,expand=720:576 -lavcopts aspect=16/9" with the
> explanation: "To calculate the correct scaling size, use the
> expanded PAL width of 1024/2.35 = 432", but why? Where does these
> values come from?

Video pixels are not square:
 http://www.mir.com/DMG/aspect.html

Martin