[yup]

zerowalker!
try

SetmtMode(3,4)
AVISource("tape1.avi").Trim(0,129057)
AssumeTFF()
SetmtMode(2,4)
source=ConvertToYV12(interlaced=true).Crop(16,12,-16,-12)
bob=source.nnedi3(field=-2,threads=1)
super = bob.MSuper(pel=2, sharp=1)
backward_vec2 = MAnalyse(super, isb = true, delta = 4, blksize=16, overlap=8, chroma=false)
backward_vec1 = MAnalyse(super, isb = true, delta = 2, blksize=16, overlap=8, chroma=false)
forward_vec1 = MAnalyse(super, isb = false, delta = 2, blksize=16, overlap=8, chroma=false)
forward_vec2 = MAnalyse(super, isb = false, delta = 4, blksize=16, overlap=8, chroma=false)
bc2 = bob.MCompensate(super, backward_vec2)
bc1 = bob.MCompensate(super, backward_vec1)
fc1 = bob.MCompensate(super, forward_vec1)
fc2 = bob.MCompensate(super, forward_vec2)
Interleave(bc2,bc1,bob,fc1,fc2)
dfttest(sigma=100.0,tbsize=5,sbsize=16,sosize=12,threads=1)
Edibob=SelectEvery(5,2).nnedi3_rpow2(2,nsize=4,cshift="Spline36Resize",fwidth=720,fheight=576,threads=1)
Edibob.SeparateFields().SelectEvery(4,0,3).Weave().AssumeTFF()
QTGMC( Preset="fast", FPSDivisor=2, Ediext=Edibob,EdiThreads=1 )

Tune sigma, 100 good starting point. Script include work with borders.
-Vit-
This script better denoise than QTGMC. I remember Your suggestion, but for analog capture need external prefilter.
Also filtering on bobbed give better result than on fields.
Work slow 1.5-2 fps on Quad Core.
yup.