Problem - odd pattern of blended fields in NTSC anime source. Best that most deblenders can do is 1/4 clean frames, 3/4 horrible ones. Looking at the fields, 2/4 have two clean (enough) fields to work with, 2/4 have one clean field and one blended field.

See the frames generally given (PNG so not far off three meg)

Vob piece in annoyingly-split-rar-named-as-zip to get round lamehost: Chunk.part1.rar.zip and Chunk.part2.rar.zip (three and a bit meg)

The best I've got with pattern matching, upsized vertical to stress the bob even more. The xvid avi, or a snow avi for fun Some filtering applied for prettiness and better compresion.

A works-for-this-clip-only avs solution:

sf = clip.TDeint(mode=1, type=1).LanczosResize(640,480).SelectEvery(5,2).AssumeFPS(23.976)
dw = clip.DoubleWeave().LanczosResize(640,480).SelectEvery(5,4).AssumeFPS(23.976)
ConditionalFilter(clip, sf, dw, "current_frame % 2", "=", "1")

A generic(ish) four-frame selector, work around for the ChangeFPS() bug by adding blank space to the start... and the last frame is DoubleWeave()-ed wrongly (seems to wrap to start?)

output_w = 704
output_h = 528
output_fps = 23.976
global offset = 0

frame_a = 2
frame_b = 4
frame_c = 7
frame_d = 9

method_a = clip.TDeint(mode=1, type=1)			#.ShowFrameNumber().Subtitle("A")
method_b = clip.DoubleWeave()				#.ShowFrameNumber().Subtitle("B")
method_c = clip.TDeint(mode=1, type=1)			#.ShowFrameNumber().Subtitle("C")
method_d = clip.DoubleWeave()				#.ShowFrameNumber().Subtitle("D")

method_c = BlankClip(method_c, length=10) + method_c
method_d = BlankClip(method_d, length=10) + method_d

fa = method_a.LanczosResize(output_w,output_h).SelectEvery(10,frame_a).ChangeFPS(output_fps)
fb = method_b.LanczosResize(output_w,output_h).SelectEvery(10,frame_b).ChangeFPS(output_fps)
fc = method_c.LanczosResize(output_w,output_h).SelectEvery(10,frame_c).ChangeFPS(output_fps)
fd = method_d.LanczosResize(output_w,output_h).SelectEvery(10,frame_d).ChangeFPS(output_fps)

ScriptClip(fa, "f = (current_frame - offset) % 4" + chr(13)
\		+ "(f == 0) ? fa : (f == 1) ? fb : (f == 2) ? fc : fd")

I also have a hellish using recursion for loops, strings for arrays, etc avs for passing the pattern you want to use to a function...