How to deinterlace these shifted pattern ?

[mbcd]

Should not be very unnormal, but I dont have luck to reconstruct it somehow.

I got following interlaced pattern (upperfield, lowerfield):

AA (fine fullframe)
BA
CB
DC
... (continues with shift)
...
JI
JJ (fine fullframe)
KK (fine fullframe)
LL (fine fullframe)
...
...

Doing a pattern could give a:
AA
A(A)
BB
CC
DD
...
II
J(J)
JJ
KK
LL

It seems up to now that there are no missing frames or fields, but I am not able to reconstruct the correct pattern without missing or doubled frames.

My source has lots of this problems, there are many shifted fields, and sometimes doubled.
Lots of sequences are correct (fullframe), but you often have shifted sequences and that not only at scenechanges.

I think that it should be possible to reconstruct it correctly by comparing and shifting fields but I didnt found a way to do this.
It seems they they did a small speedup whith this, because on this way, they insert an additional frame.


My Idea is to try to recreate a frame finding his both fields and throwing away frames, were only one of both fields are left.
Is there a final solution existing, or can someone code (hopefully only) some lines please?

[Shirtfull]

Without a sample to examine, start with this
Separatefields()# then work through video to find pattern, then use in
Selectevery() to re-order fields
Weave

[manono]

Sample please. 10 seconds of steady movement.