[HELP] Possible to go from PNG input stream to PNG output stream in VapourSynth?

[Selur]

Looking at the script:

# Imports
import vapoursynth as vs
# getting Vapoursynth core
core = vs.core
# Loading Plugins
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/Support/libimwri.dll")
# defining beforeLSFMod-function - START
def beforeLSFMod(clip):
  import os
  import sys
  import ctypes
  # Loading Support Files
  Dllref = ctypes.windll.LoadLibrary("C:/Program Files/Hybrid/64bit/vsfilters/Support/libfftw3f-3.dll")
  # Import scripts folder
  scriptPath = 'C:/Program Files/Hybrid/64bit/vsscripts'
  sys.path.append(os.path.abspath(scriptPath))
  # Loading Plugins
  core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/SharpenFilter/CAS/CAS.dll")
  core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/DenoiseFilter/DFTTest/DFTTest.dll")
  # Import scripts
  import havsfunc
  clip = havsfunc.LSFmod(input=clip, strength=100, Smode=2, Smethod=3, secure=True, Lmode=4, soft=-2, edgemaskHQ=True, preblur=1, ss_x=1.5)
  return clip
# defining beforeLSFMod-function - END

# source: 'F:/Test/source/000000.png'
# current color space: RGB24, bit depth: 8, resolution: 1440x960, fps: 23.976, color matrix: 709, yuv luminance scale: full, scanorder: progressive
# Loading F:\Test\source\%06d.png using vsImageReader
clip = core.imwri.Read("F:/Test/source/%06d.png", firstnum=0)
clip = core.std.Trim(clip=clip, length=501)
# Input color space is assumed to be RGB24
# making sure frame rate is set to 23.976
clip = core.std.AssumeFPS(clip=clip, fpsnum=24000, fpsden=1001)
# Setting color range to PC (full) range.
clip = core.std.SetFrameProp(clip=clip, prop="_ColorRange", intval=0)
clip = beforeLSFMod(clip)
# adjusting output color from: RGB24 to YUV444P8 for PNGModel
clip = core.resize.Bicubic(clip=clip, format=vs.YUV444P8, matrix_s="709", range_s="full")
# set output frame rate to 23.976fps
clip = core.std.AssumeFPS(clip=clip, fpsnum=24000, fpsden=1001)
# Output
clip.set_output()

Does this work in the Vapoursynth Preview?

I assume it does not, since you apply:

clip = havsfunc.LSFmod(input=clip, strength=100, Smode=2, Smethod=3, secure=True, Lmode=4, soft=-2, edgemaskHQ=True, preblur=1, ss_x=1.5)

on an RGB24 clip which will not work, as LSFMod only works on YV12 content.

Also: Why use LSFmod this way and not through Filtering->Vapoursynth->Sharpen->LSFmod?

Cu Selur