Encoding doesn't start - "missing input"

[Selur]

Vapoursynth script:

# Imports
import os
import sys
import ctypes
# Loading Support Files
Dllref = ctypes.windll.LoadLibrary("C:/Program Files/Hybrid/64bit/vsfilters/Support/libfftw3f-3.dll")
import vapoursynth as vs
# getting Vapoursynth core
core = vs.core
# Import scripts folder
scriptPath = 'C:/Program Files/Hybrid/64bit/vsscripts'
sys.path.insert(0, os.path.abspath(scriptPath))
# Loading Plugins
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/GrainFilter/RemoveGrain/RemoveGrainVS.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/GrainFilter/AddGrain/AddGrain.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/DenoiseFilter/NEO_FFT3DFilter/neo-fft3d.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/DenoiseFilter/DFTTest/DFTTest.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/Support/EEDI3m.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/ResizeFilter/nnedi3/vsznedi3.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/Support/libmvtools.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/Support/temporalsoften.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/Support/scenechange.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/Support/fmtconv.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/MiscFilter/MiscFilters/MiscFilters.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/SourceFilter/LSmashSource/vslsmashsource.dll")
# Import scripts
import havsfunc
# source: 'X:\Analogue\Video\Capture\TAPE_(20220120-1710).avi'
# current color space: YUV422P8, bit depth: 8, resolution: 720x576, fps: 25, color matrix: 470bg, yuv luminance scale: limited, scanorder: top field first
# Loading X:\Analogue\Video\Capture\TAPE_(20220120-1710).avi using LWLibavSource
clip = core.lsmas.LWLibavSource(source="X:/Analogue/Video/Capture/TAPE_(20220120-1710).avi", format="YUV422P8", cache=0, prefer_hw=0)
# making sure input color matrix is set as 470bg
clip = core.resize.Bicubic(clip, matrix_in_s="470bg",range_s="limited")
# making sure frame rate is set to 25
clip = core.std.AssumeFPS(clip=clip, fpsnum=25, fpsden=1)
# Setting color range to TV (limited) range.
clip = core.std.SetFrameProp(clip=clip, prop="_ColorRange", intval=1)
# setting field order to what QTGMC should assume (top field first)
clip = core.std.SetFrameProp(clip=clip, prop="_FieldBased", intval=2)
# Deinterlacing using QTGMC
clip = havsfunc.QTGMC(Input=clip, Preset="Faster", TFF=True) # new fps: 50
# make sure content is preceived as frame based
clip = core.std.SetFieldBased(clip, 0)
clip = core.fmtc.resample(clip=clip, kernel="spline16", w=768, h=576, interlaced=False, interlacedd=False)
# adjusting output color from: YUV422P16 to YUV422P8 for x264Model
clip = core.resize.Bicubic(clip=clip, format=vs.YUV422P8, range_s="limited")
# set output frame rate to 50.000fps
clip = core.std.AssumeFPS(clip=clip, fpsnum=50, fpsden=1)
# Output
clip.set_output()

looks fine.
Encoding call:

C:\Program Files\Hybrid\64bit\Vapoursynth\vspipe.exe" "X:\Analogue\Video\Encoded\Temp\encodingTempSynthSkript_2022-02-04@12_51_21_6310.vpy" - -c y4m | "C:\Program Files\Hybrid\64bit\x264.exe" --preset slow --crf 20.00 --profile high422 --level 4.1 --sync-lookahead 18 --qcomp 0.80 --ipratio 1.10 --pbratio 1.10 --no-dct-decimate --psy-rd 1.00:0.25 --aq-strength 0.50 --vbv-maxrate 50000 --vbv-bufsize 187500 --deadzone-inter 6 --deadzone-intra 6 --sar 1:1 --deblock -2:-2 --non-deterministic --range tv --colormatrix bt470bg --demuxer y4m --input-range tv --fps 50/1 --output-csp i422 --output-depth 8 --output "X:\Analogue\Video\Encoded\Temp\2022-02-04@12_51_21_6310_02.264" -

looks fine too.

No clue why it would take 4min on your system to start the encoding.
Wild guess would be that you got some anti virus software or similar running which is interfering with the processing.

Cu Selur