Very Effective Field Matching script

[Ceppo]

Sorry, I disappeared, but soon I will again. However, today I was playing with avisynth and I found a nice way to make field matching thanks to the VMAF2 plugin. Basically you make a c/n/p match clips, then you deinterlace them with a simple vertical blur, then you make a comparison using the PSNR metric. The highest wins, of course. Works in 99.9% of the cases on my source. I don't have time to make a plugin so, if someone likes it, please do.

mpeg2Source("VTS_01_1.d2v")
global c = last
global n = DoubleWeave(c).SelectOdd()
global p = DoubleWeave(c).SelectOdd().DuplicateFrame(0)
global c = VMAF2(c,Blur(c,0,1),feature = 0)
global n = VMAF2(n,Blur(n,0,1),feature = 0)
global p = VMAF2(p,Blur(p,0,1),feature = 0)
c
ScriptClip("""
propGetFloat(n,"psnr_y") > propGetFloat(c,"psnr_y")  ? n : \
propGetFloat(p,"psnr_y") > propGetFloat(c,"psnr_y")  ? p : c
""")

The PSNR metric can be also used to detect duplicates to do decimation, since duplicate have a very high PSNR score.

[kedautinh12]

any chance in this situation for the first part??
https://forum.doom9.org/showthread.p...02#post1992102

[Ceppo]

Not sure what you mean.

[kedautinh12]

Originally Posted by Ceppo

Not sure what you mean.

Sr for my bad English, edited

[Ceppo]

I have no idea.

BTW, never used vapoursynth but I did a version for it too.

import vapoursynth as vs
core = vs.core

c = core.d2v.Source("VTS_01_1.d2v")
n = core.std.SeparateFields(c)
n = core.std.DoubleWeave(n)
n = core.std.SelectEvery(n,2,1)
p = core.std.DuplicateFrames(n,0)

c = core.vmaf.Metric(c,core.std.BoxBlur(c,hradius=0),0)
n = core.vmaf.Metric(n,core.std.BoxBlur(n,hradius=0),0)
p = core.vmaf.Metric(p,core.std.BoxBlur(p,hradius=0),0)

def SelectFrame(n, f):
   A = f[0].props["psnr_y"]
   B = f[1].props["psnr_y"]
   C = f[2].props["psnr_y"]
   if B > A:
       return f[1]
   elif C > A:
       return f[2]
   else:
       return f[0]

core.std.ModifyFrame(clip=c,clips=[c, n, p],selector=SelectFrame).set_output()

[kedautinh12]

Selur will happy for it

[Ceppo]

With vinverse we are at the 100% of correct match on my source.

mpeg2Source("VTS_01_1.d2v")
global c = last
global n = DoubleWeave(c).SelectOdd()
global p = DoubleWeave(c).SelectOdd().DuplicateFrame(0)
global c = VMAF2(c,vinverse(c),feature = 0)
global n = VMAF2(n,vinverse(n),feature = 0)
global p = VMAF2(p,vinverse(p),feature = 0)
c
ScriptClip("""
propGetFloat(n,"psnr_y") > propGetFloat(c,"psnr_y")  ? n : \
propGetFloat(p,"psnr_y") > propGetFloat(c,"psnr_y")  ? p : c
""")

[SaurusX]

Very interesting. I've got just the project to test this on.

[Ceppo]

This should be more precise.

global c = last
global n = DoubleWeave(c).SelectOdd()
global p = DoubleWeave(c).SelectOdd().DuplicateFrame(0)
global c = VMAF2(c,vinverse(c),feature = 0)
global n = VMAF2(n,vinverse(n),feature = 0)
global p = VMAF2(p,vinverse(p),feature = 0)
c
ScriptClip("""
n_metric = propGetFloat(n,"psnr_y") + propGetFloat(n,"psnr_cb") + propGetFloat(n,"psnr_cr")
c_metric = propGetFloat(c,"psnr_y") + propGetFloat(c,"psnr_cb") + propGetFloat(c,"psnr_cr")
p_metric = propGetFloat(p,"psnr_y") + propGetFloat(p,"psnr_cb") + propGetFloat(p,"psnr_cr")
n_metric > c_metric && n_metric > p_metric ? n : \
p_metric > c_metric && p_metric > n_metric ? p : c
""")

[Selur]

Can't get the Vapoursynth version working.
I used the code from post #5, packed it into a function and adjusted SelectFrame, where:

  if B > A:
       return f[1]
   elif C > A:
       return f[2]
   else:
       return f[0]

to:

     if B > A:
       if B > C:
         return f[1]
       return f[2]
     elif C > A:
         return f[2]
     else:
         return f[0]

I ended up with:

# FieldMatching from https://forum.doom9.org/showthread.php?t=185104 by Ceppo
# requires: 
#   havsfunc https://github.com/Selur/VapoursynthScriptsInHybrid/blob/master/havsfunc.py when Vinverse is enabled (!not working atm!)
#   VMAF: https://github.com/HomeOfVapourSynthEvolution/VapourSynth-VMAF
def cFieldMatch(clip: vs.VideoNode, chroma: bool=False, vinverse: bool=False):
  # prepare
  n = clip
  n = core.std.SeparateFields(clip=n) # separate frames
  n = core.std.DoubleWeave(clip=n) # double weave
  n = core.std.SelectEvery(clip=n, cycle=2, offsets=1) # select odd
  p = core.std.DuplicateFrames(clip=n, frames=[0]) # duplicate first frame

  # calculate PSNR 
  if vinverse: 
    import havsfunc
    c = core.vmaf.Metric(reference=clip, distorted=havsfunc.Vinverse(clip), feature=[0])
    n = core.vmaf.Metric(reference=n,    distorted=havsfunc.Vinverse(n),    feature=[0])
    p = core.vmaf.Metric(reference=p,    distorted=havsfunc.Vinverse(c),    feature=[0])
  else:
    c = core.vmaf.Metric(reference=clip, distorted=core.std.BoxBlur(clip,hradius=0), feature=[0])
    n = core.vmaf.Metric(reference=n,    distorted=core.std.BoxBlur(n,hradius=0),    feature=[0])
    p = core.vmaf.Metric(reference=p,    distorted=core.std.BoxBlur(p,hradius=0),    feature=[0])
  
  def SelectFrameChroma(n, f):
     A = f[0].props["psnr_y"] + f[0].props["psnr_cb"] + f[0].props["psnr_cr"] # c
     B = f[1].props["psnr_y"] + f[1].props["psnr_cb"] + f[1].props["psnr_cr"] # n
     C = f[2].props["psnr_y"] + f[2].props["psnr_cb"] + f[2].props["psnr_cr"] # p
     # return max
     if B > A:
       if B > C:
         return f[1]
       return f[2]
     elif C > A:
         return f[2]
     else:
         return f[0]
  def SelectFrame(n, f):
     A = f[0].props["psnr_y"] # c
     B = f[1].props["psnr_y"] # n
     C = f[2].props["psnr_y"] # p
     # return max
     if B > A:
       if B > C:
         return f[1]
       return f[2]
     elif C > A:
         return f[2]
     else:
         return f[0]
  # select
  if chroma:
    return core.std.ModifyFrame(clip=c, clips=[c, n, p], selector=SelectFrameChroma)
  return core.std.ModifyFrame(clip=c, clips=[c, n, p], selector=SelectFrame)

The problem is: It does not work. At least here, it does not field match at all.

Does anyone have an idea why it does not work?

Cu Selur

[Ceppo]

Let me change the problem. Is there a tutorial/sample for making vapoursynth plugins?

[Selur]

https://forum.doom9.org/showthread.php?t=182961 maybe ?

[kedautinh12]

Did you try with IT, Ceppo??
https://github.com/Asd-g/AviSynthPlu...ent-1771105416