Here is a script that works really well at converting 1920x1080x50p to 720x576x25i (DVD standard). You may need to change the SelectEvery, to get the field order correct. Also change the sharpen to suit the source material.
bicubicresize(1440,1152)
bicubicresize(720,1152,-.8,.6)
bicubicresize(720,576,-.8,.6)
blur(0.0,1.0)
sharpen(0.0,0.75)
assumeBff()
separatefields()
SelectEvery(4,1,2)
Weave()
Matrix(from=709, to=601)
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