[halsboss]

Well, that's floored me, look at the signs on SHIFT in this link http://forum.doom9.org/showthread.ph...81#post1172981

Function Foo(clip clip, float shift) {
  Clip
  Tc=SelectEven().Spline36resize(NewWidth, NewHeight/2, 0, -Shift, Width(), Height()) 
  Bc=SelectOdd().Spline36resize(NewWidth, NewHeight/2, 0, Shift, Width(), Height()) 
  Interleave(Tc, Bc)
  Weave()
}

which, just a few posts later http://forum.doom9.org/showthread.ph...85#post1174185 turns into

SeparateFields()

Shift = (GetParity() ? -0.25 : 0.25) * (Height()/Float(NewHeight/2)-1.0)

Elum = SelectEven().Spline36Resize(NewWidth, NewHeight/2, 0,    Shift)
Olum = SelectOdd() .Spline36Resize(NewWidth, NewHeight/2, 0,   -Shift)
Echr = SelectEven().Spline36Resize(NewWidth, NewHeight/2, 0,  2*Shift)
Ochr = SelectOdd() .Spline36Resize(NewWidth, NewHeight/2, 0, -2*shift)

Interleave(Elum, Olum)
IsYV12() ? MergeChroma(Interleave(Echr, Ochr)) : Last
Weave()

whihc is it ??