IVTC-ing only 2 frames within a 3000 frames encode

[chros]

I have got a vob (1887 frames) (Alien 4 teaser trailer) in which there are 2 frames in which are visible artifact (at separate places). (Source is a 4:3 , NTSC, 29.97fps)
after DGmpeg -> 23.976 fps

Megui reports when I Analyze (at the avisynth creation stage):
Progressive sections: 84
Interlaced sections: 2
Partialyy Static Sections: 71
Film Sections: 0
Source is declared progressive. -> do nothing

So can I deinterlace just these 2 frames ? And if I can, how ?

The MeGui created Avisynth script:
DGDecode_mpeg2source("Alien4.d2v",info=3)
ColorMatrix(hints=true)
#Not doing anything because the source is progressive
crop( 4, 54, -14, -60)

LanczosResize(640,368) # Lanczos (Sharp)
#denoise
Thanks

[foxyshadis]

full=false in tdeint or fielddeinterlace; some magic with IsCombed(); or just use Stickboy's ReplaceRange (http://www.avisynth.org/stickboy/jdl-range.avsi) to replace just those frames with deinterlaced ones.

The first three you have to be extremely careful with all the various thresholds or you'll get bad false positives, but they're easier if you have lots of frames and aren't sure where they all are.

[Blue_MiSfit]

could just trim the offending frames out, no? I know this is the dark side way of doing things, but it's only 2 frames!! :)

I know the syntax isn't great, but maybe (assuming the 2 frames are consecutive)

#pseudocode
a=last
b=a.trim(0,start of evil interlaced nonsense)
c=a.trim(end of evil interaced nonsense, end of file)
d=b+c

return(d)



~MiSfit

[Mug Funky]

try:

function deintframe(clip c, int frame, int "field")
{
field=default(field,1)
c.trim(0,frame-1)++c.trim(frame,frame).separatefields().selectevery(1,1-field)
\.assumefps(c.framerate()).eedi2(field=field)++c.trim(frame+1,0)
}

blahsource("blah.blh")

yourfiltershere()

deintframe(first_frame_number)
deintframe(second_frame_number)

[Prettz]

blahsource("blah.blh")
lol .blh

[chros]

... or just use Stickboy's ReplaceRange (http://www.avisynth.org/stickboy/jdl-range.avsi) to replace just those frames with deinterlaced ones.
Hhmmm, I didn't know that... Thanks.
could just trim the offending frames out, no?
This can be a good idea too, if I can't do anything else. Thanks.
Ps: see the above mentioned ReplaceRange function collection, there are functions for cutting.

@Mug Funky: I have tried it and it works very well.
Only the second framenumber varys after the 1st was modified.
I'll look into the function, why, and what it does.
Thanks.