Decimate improperly deinterlaced sources?

[Zarxrax]

I have an old video that should have been IVTCed, but it was simply deinterlaced, and I no longer have access to the source. If there a method to simply decimate the blended frames to get a 23.976fps output? It seems like it should be easy enough...

[mg262]

I don't think decimation will be quite enough:

A B C D D (30fps)
A B B C D

After these are blended, C no longer exists. It's still pretty simple to reverse -- I'm pretty sure scharfis posted a script to do this once, although a script probably wont cope with pattern breaks very well.

I am interested in looking at this stuff...would you be able to upload a chunk of the source?

[Zarxrax]

From what I can tell, the blended frame is just a blend of the previous and next frame, so there isn't actually any missing frame. Here's a scene with just a panning motion, so its easy to see.
http://s37.yousendit.com/d.aspx?id=2FS59JGN2ELDM0AEKH6U1QT9W2

[scharfis_brain]

this http://forum.doom9.org/showthread.php?t=75869
may be useful, but it is not up to date, so you'll probably need to modify the script.

[Zarxrax]

That script seems to not work on this material. In fact it seems to add 2 additional "blended" frames to the sequence, leaving only 1 good frame :p

[scharfis_brain]

yeah. this script is not suited for this kind of video.

loadplugin("D:\x\unblend.dll")
loadplugin("D:\x\decomb.dll")
avisource("deinterlace.avi")
unblend()
decimate()

helps!

[Zarxrax]

Right on! Thanks!