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Copy the code below into a file 'RestoreSuper8Frames.avsi' in your AviSynth plugins directory or directly into your script:

 # RestoreSuper8Frames()   ( 9 Mar 2007 )
 # A combed-frames eliminator for transcript of old movies to video by Martin Wagener
 # RestoreSuper8Frames() is designed to select the video frames that were best exposed with single images of the movie
 # and transform all the other frames to plain black.
 # RestoreSuper8Frames() expects a data stream with at least 3 and no more than 4 time the field(!) rate of the movie.
 # i.e. the video frame rate must be between 1.5 and 2 of the movie image rate.
 # The algorithm is simple: with the help of FieldDeinterlace(), the combing of the previous, current and
 # next frame are compared and a black frame is returned if the current frame is not the minimum.
 # The filter returns irregular sequences of single best-choice frames and one to three black frames.
 # These sequences can be turned into alternating black-good-black-good sequences with MultiDecimate()
 # and then into the perfect sequence with SelectEven().
 # In favor to guarantee that it is always SelectEven() and not SelectOdd() for the good frames,
 # this filter always turns the first frame black.
 # To supply RestoreSuper8Frames() with the neccessary frames, use DoubleWeave().
 # DoubleWeave() will recombine all fields of the raw video in a way that always outputs one uncombed frame in the sequence.
 # Movie:        |   A  |~|   B   |~|   C  |~|   D   ( A...D are the movie images - Projector slow at B, ~ is shutter)
 # source vid.:  |a* a*|b  b*|c* c*|d  d*|e* e |     (a..e are the video frames, * shows the uncombed)
 #               |1  2 |1  2 |1  2 |1  2 |1  2 |     (1 and 2 are the the fields of the frames)
 #               |  a  |  b  |  c  |  d  |  e  |     (this shows the complete frames before DoubleWeave()
 # DoubleWeave:  |aa|ab|bb|bc|cc|cd|dd|de|ee|
 #               |12|21|12|21|12|21|12|21|12|
 #               |a |a'|b |b'|c |c'|d |d'|e |        (the frames after DoubleWeave())
 #                A  -  -  B  -  -  -  C  -          (A-C=good frames after RestoreSuper8Frames(), -=black frames)
 # The exact(!) image sequence of the celluloid movie will be reconstructed if the camera takes not less than
 # three and not more than four fields per image.
 ## --------
 function RestoreSuper8Frames(clip "clip", bool "map", bool "show")
     map= default(map, false)
     SC= "clip=(ip<=ic)?blank:last"+chr(13)+"clip=(in<ic)?blank:clip"+chr(13)+"return((RS8Fshow)?clip.Subtitle(string(ic)):clip)"
     FE= "ip=AverageLuma(cp)"+chr(13)+"ic=AverageLuma(cc)"+chr(13)+"in=AverageLuma(cn)"
     global RS8Fshow= default(show,false)
     global ip=0
     global ic=0
     global in=0
     global cf=clip.GreyScale().HorizontalReduceBy2().Blur(1.58,0)
     global blank=BlankClip(clip,length=clip.FrameCount(),color=0)
     global cp=cf.DuplicateFrame(0).FieldDeinterlace(threshold=255,dthreshold=dt,map=true).Levels(140,1,255,0,255,coring=false)
     global cc=cf.FieldDeinterlace(threshold=255,dthreshold=dt,map=true).Levels(140,1,255,0,255,coring=false)
     global cn=cf.DeleteFrame(0).DuplicateFrame(clip.Framecount()-1).FieldDeinterlace(threshold=255,dthreshold=dt,map=true).Levels(140,1,255,0,255,coring=false)
     f1= clip.ScriptClip(SC)
     f0= f1.FrameEvaluate(FE)
     return((map) ? Overlay(f0,clip,opacity=0.5).Overlay(BilinearResize(cc,clip.Width(),clip.Height()),opacity=0.5,mode="add") : f0)
 #   return((show) ? BilinearResize(cc,clip.Width(),clip.Height()) : f0)

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