Way to replace single field in non-interlaced frame of telecined clip without bob?

[cobo]

For some reason the second field of one frame in a TFF telicined clip is messed up. How can I replace it with a feild derived from the first field of the frame? The two previous frames are interlaced and the following two are not.

The only thing I could come up with so far is to replace it with a copy of the first field, but that makes it appear to bob:
SeparateFields()
FreezeFrame(21271,21271,21270)
Weave()

It's only noticable when stepping through the clip not when it's played, but I wondered if there was some better way of doing it.

[scharfis_brain]

you have to replace even fields with even fields and odd fields with odd fields.
if you replace a even field with a odd field (or vice versa) you'll get the bob-look (ie halved vertical resolution)

[cobo]

Is there some way to bob-deinterlace just one frame and throw out the second frame produced by the bob-deinterlace? I can't figure out how to do it.

[cobo]

I see now that I just needed to replace the bad bottom field with the bottom field from the previous interlaced frame since in this case, due to telecining, it's exactly the same field except that it's not messed up.

[Alain2]

To throw away 1 field and interpolate it from the other one, you can try sangnom (but it produces artefacs sometimes), or eedi (a bit slower but better quality) for instance.