tricky IVTC question

[theeht]

I have some video captured in avi from a VHS source at 29.97 fps, 352x480 resolution. The material is a Russian silent film from 1927.
The progressive/interlaced sequence pattern, consistent throughout the film, is:

2 frames progressive, 1 frame interlaced, 1 frame progressive, 1 frame interlaced.

Can anyone give me a strategy for inverse telecine using either VirtualDub or Avisynth? I tried using decomb.dll with the following in an avisynth script fed to VirtualDubMod:

Telecide()
Decimate(cycle=5)

But the resulting file gave me many repeated frames, occurring in a pattern I can't figure out, i.e. the following sequence:
single repeated frame after 1,3,4,3,1,3,3,5,1,4 frames

I also tried using the TElecide filter in Virtualdub with threshold of 10, which let some interlacing artifacts through but with no repeated frames (slower to encode as well, of course).

Any help would be much appreciated. Hope this is clear, I'm not advanced in these matters.

[theeht]

Sorry, might as well disregard--I looked at some other sections and the pattern of the captured video is very irregular. Guess I will settle for an imperfect reconstruction.

[neuron2]

I made a special tool called MultiDecimate() for properly decimating these silent movies. 'manono' is the expert on using it and working on silents. Maybe you can get him to have a look. I am sure you can do a better job of it using MultiDecimate().

[theeht]

Thank you for the info! I will give it a try. Certainly looks like the proper tool, if I can figure it out.

And thank you for all the other work you've done as well.