[BUG] Filter: Line/Darken (GLSL-A4K) = defective

[BUG] Filter: Line/Darken (GLSL-A4K) = defective - Printable Version

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+--- Thread: [BUG] Filter: Line/Darken (GLSL-A4K) = defective (/thread-4472.html)

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Filter: Line/Darken (GLSL-A4K) = defective - tailland - 22.08.2026

version 21.8.2026

load source
activate filter
vaporsynth does not open, no error popup, nothing (therefor, no screenshot)

other darkening filters work.

RE: Filter: Line/Darken (GLSL-A4K) = defective - Selur - 22.08.2026

According to the debug output, FastLineDarkenMOD was used,...

# Imports
import ctypes
import sys
import os
import vapoursynth as vs
# using Vapoursynth R79
# 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 Support Files
Dllref = ctypes.windll.LoadLibrary("C:/Program Files/Hybrid/64bit/vsfilters/Support/libfftw3f-3.dll")
# loading plugins
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/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/bwdif.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/fmtconv.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/znedi3.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/sneedif/libsneedif.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/eedi3m.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/vszip/vszip.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/addnoise.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/mvutensils/mvutensils.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/akarin/libakarin.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/zsmooth/zsmooth.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/SourceFilter/d2vSource/DGDecode.dll")
# Import scripts
import linedarken
import qtgmc
import validate
# Source: 'S:\youtube_temp\KHG-Abi-1996_Teil-2-Kurioses.mpg'
# clip current meta; color space: YUV420P8, bit depth: 8, resolution: 720x576, fps: 25, color matrix: 470bg, color primaries: Unspecific, color transfer: BT.601, yuv luminance scale: limited, scanorder: top field first, full height: true (Source)
# Loading 'S:\youtube_temp\KHG-Abi-1996_Teil-2-Kurioses.mpg' using DGDecode
clip = core.dgdecode.MPEG2Source("D:/temp_hybrid/mpg_89c1c02461a1f11c770077d6e8011af2_853323747.d2v",info=3)# 25 fps, scanorder: top field first
frame = clip.get_frame(0)
# setting color matrix to 470bg.
clip = core.std.SetFrameProps(clip, _Matrix=vs.MATRIX_BT470_BG)
# setting color transfer (vs.TRANSFER_BT601), if it is not set.
if validate.transferIsInvalid(clip):
  clip = core.std.SetFrameProps(clip=clip, _Transfer=vs.TRANSFER_BT601)
# setting color primaries info (to vs.PRIMARIES_BT470_BG), if it is not set.
if validate.primariesIsInvalid(clip):
  clip = core.std.SetFrameProps(clip=clip, _Primaries=vs.PRIMARIES_BT470_BG)
# setting color range to TV (limited) range.
prop_name = '_Range' if core.core_version.release_major >= 74 else '_ColorRange'
clip = core.std.SetFrameProps(clip=clip, **{prop_name: vs.RANGE_LIMITED})
# making sure frame rate is set to 25fps
clip = core.std.AssumeFPS(clip=clip, fpsnum=25, fpsden=1)
# making sure the detected scan type is set (detected: top field first)
clip = core.std.SetFrameProps(clip=clip, _FieldBased=vs.FIELD_TOP) # scan type: top field first
# Deinterlacing using QTGMC
clip = qtgmc.QTGMC(clip, Preset="Fast", TFF=True) # new fps: 50
# Making sure content is perceived as frame based
clip = core.std.SetFrameProps(clip=clip, _FieldBased=vs.FIELD_PROGRESSIVE) # scan type: progressive
clip = clip[::2] # selecting previously even frames, new fps: 25
# Using FastLineDarkenMOD for line darkening
clip = linedarken.FastLineDarkenMOD(clip)
# adjusting output color from YUV420P8 to YUV420P10 for NVEncModel
clip = core.resize.Bicubic(clip=clip, format=vs.YUV420P10)
# adjusted resizing to achieve PAR 1:1 for preview
# resizing for preview to square pixel to 768x576
clip = core.resize.Bicubic(clip=clip, width=768, height=576)
# set output frame rate to 25fps (progressive)
clip = core.std.AssumeFPS(clip=clip, fpsnum=25, fpsden=1)
# output
clip.set_output()
# clip current meta; color space: YUV420P10, bit depth: 10, resolution: 768x576, fps: 25, color matrix: 470bg, color primaries: Unspecific, color transfer: BT.601, yuv luminance scale: limited, scanorder: progressive, full height: true (Meta)
# script was created by Hybrid 2026.08.21.1

Both FastLineDarkenMOD and "Darken (GLSL-A4K)" work fine here.

Cu Selur

RE: Filter: Line/Darken (GLSL-A4K) = defective - tailland - 22.08.2026

i tried 3 different line darkening filters to make sure it's the one that fails.. this output file is only for glsla4k

RE: Filter: Line/Darken (GLSL-A4K) = defective - Selur - 22.08.2026

Now the debug output shows ' Anime4k Darken GLSL ':

# Imports
import ctypes
import sys
import os
import vapoursynth as vs
# using Vapoursynth R79
# 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 Support Files
Dllref = ctypes.windll.LoadLibrary("C:/Program Files/Hybrid/64bit/vsfilters/Support/libfftw3f-3.dll")
# loading plugins
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/libvs_placebo.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/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/bwdif.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/fmtconv.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/znedi3.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/sneedif/libsneedif.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/eedi3m.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/vszip/vszip.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/addnoise.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/mvutensils/mvutensils.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/akarin/libakarin.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/zsmooth/zsmooth.dll")
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/SourceFilter/d2vSource/DGDecode.dll")
# Import scripts
import qtgmc
import validate
# Source: 'S:\youtube_temp\KHG-Abi-1996_Teil-2-Kurioses.mpg'
# clip current meta; color space: YUV420P8, bit depth: 8, resolution: 720x576, fps: 25, color matrix: 470bg, color primaries: Unspecific, color transfer: BT.601, yuv luminance scale: limited, scanorder: top field first, full height: true (Source)
# Loading 'S:\youtube_temp\KHG-Abi-1996_Teil-2-Kurioses.mpg' using DGDecode
clip = core.dgdecode.MPEG2Source("D:/temp_hybrid/mpg_89c1c02461a1f11c770077d6e8011af2_853323747.d2v",info=3)# 25 fps, scanorder: top field first
frame = clip.get_frame(0)
# setting color matrix to 470bg.
clip = core.std.SetFrameProps(clip, _Matrix=vs.MATRIX_BT470_BG)
# setting color transfer (vs.TRANSFER_BT601), if it is not set.
if validate.transferIsInvalid(clip):
  clip = core.std.SetFrameProps(clip=clip, _Transfer=vs.TRANSFER_BT601)
# setting color primaries info (to vs.PRIMARIES_BT470_BG), if it is not set.
if validate.primariesIsInvalid(clip):
  clip = core.std.SetFrameProps(clip=clip, _Primaries=vs.PRIMARIES_BT470_BG)
# setting color range to TV (limited) range.
prop_name = '_Range' if core.core_version.release_major >= 74 else '_ColorRange'
clip = core.std.SetFrameProps(clip=clip, **{prop_name: vs.RANGE_LIMITED})
# making sure frame rate is set to 25fps
clip = core.std.AssumeFPS(clip=clip, fpsnum=25, fpsden=1)
# making sure the detected scan type is set (detected: top field first)
clip = core.std.SetFrameProps(clip=clip, _FieldBased=vs.FIELD_TOP) # scan type: top field first
# Deinterlacing using QTGMC
clip = qtgmc.QTGMC(clip, Preset="Fast", TFF=True) # new fps: 50
# Making sure content is perceived as frame based
clip = core.std.SetFrameProps(clip=clip, _FieldBased=vs.FIELD_PROGRESSIVE) # scan type: progressive
clip = clip[::2] # selecting previously even frames, new fps: 25
# adjusting color space from YUV420P8 to YUV444P16 for vsGLSLDarken
clip = core.resize.Bicubic(clip=clip, format=vs.YUV444P16)
# Using Anime4k Darken GLSL filter for line darkening
with open("C:/Program Files/Hybrid/64bit/vsfilters/GLSL/parameterized/Anime4K_Darken_HQ.glsl") as glslf:
  glsl = glslf.read()
glsl = glsl.replace('#define STRENGTH 1.5', '#define STRENGTH 1.5')
clip = core.placebo.Shader(clip, shader_s=glsl, width=clip.width, height=clip.height)
# adjusting output color from YUV444P16 to YUV420P10 for NVEncModel
clip = core.resize.Bicubic(clip=clip, format=vs.YUV420P10, dither_type="error_diffusion")
# adjusted resizing to achieve PAR 1:1 for preview
# resizing for preview to square pixel to 768x576
clip = core.resize.Bicubic(clip=clip, width=768, height=576)
# set output frame rate to 25fps (progressive)
clip = core.std.AssumeFPS(clip=clip, fpsnum=25, fpsden=1)
# output
clip.set_output()
# clip current meta; color space: YUV420P10, bit depth: 10, resolution: 768x576, fps: 25, color matrix: 470bg, color primaries: Unspecific, color transfer: BT.601, yuv luminance scale: limited, scanorder: progressive, full height: true (Meta)
# script was created by Hybrid 2026.08.21.1

Do other GLSL filters work?

08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: Files to index for VAPOURSYNTHPREVIEW:
  S:\youtube_temp\KHG-Abi-1996_Teil-2-Kurioses.mpg
08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: Indexer createIndexFiles disable GUI(1),..
08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: enableGui 0 + -1 = -1
08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: startIndex: S:\youtube_temp\KHG-Abi-1996_Teil-2-Kurioses.mpg
08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9:  skipping indexing, D:\temp_hybrid\mpg_89c1c02461a1f11c770077d6e8011af2_853323747.d2v already exists,...
08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: VsScriptGenerator indexerFinished(4612,0): VAPOURSYNTHPREVIEW
08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: VsScriptGenerator indexerFinished enable GUI(5),..
08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: enableGui -1 + 1 = 0
08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9:  indexing finished,..
08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9:  VapoursynthPreview enabling updating to True(1),..
08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9:  send changeTo to vsviewer,..
08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: Sending to viewer: changeTo ### D:\temp_hybrid\tempPreviewVapoursynthFile21_18_53_968.vpy ### 
08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: set messeage to: changeTo ### D:\temp_hybrid\tempPreviewVapoursynthFile21_18_53_968.vpy ### 
08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: [Hybrid Client]: connected, sending to server: changeTo ### D:\temp_hybrid\tempPreviewVapoursynthFile21_18_53_968.vpy ### 
08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: [Hybrid Client]: connected, nothing to send,..
08.22 - 21:18:53_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: Preview::indexingIsFinished 'VAPOURSYNTHPREVIEW' ignored,..
08.22 - 21:18:57_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: player finished,...
08.22 - 21:18:57_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: ExitCode: -1073741819, status: 1
08.22 - 21:18:57_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: setting updatingScript to: false
08.22 - 21:18:57_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9:  VapoursynthPreview disable show(4),..
08.22 - 21:18:57_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9: kill process,...
08.22 - 21:18:57_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9:  VapoursynthPreview disable show(3),..
08.22 - 21:18:57_Windows 11 Version 25H2 (64bit)_2026.08.21.1 - level 9:  VapoursynthPreview disable updating(3),..

"ExitCode: -1073741819" normally is some kind of access violation.

I uploaded a new dev version (Hybrid_dev_2026.08.22-212034), uninstall the old Hybrid dev, install the new and re-save your defaults after the first start.
In case you have some media player or game open, try closing that, sometimes those can interfere with GLSL filters.

Cu Selur

RE: Filter: Line/Darken (GLSL-A4K) = defective - tailland - 22.08.2026

will do, be back in a few

hm nothing new, still opens the preview window and immediately closes it again

the other glsl filters also don't work, same behaviour

RE: Filter: Line/Darken (GLSL-A4K) = defective - Selur - 22.08.2026

Okay, so it's a glsl issue.
Does Deband->vsPlacebo work? (vs-placebo is also offering the GLSL filter)
I suspect Deband will work and something is interfering with the glsl filtering.

What other tools are running?

Cu Selur

Ps.: side note: since you have an NVIDIA gpu, you could use DGDecNV for decoding.

RE: Filter: Line/Darken (GLSL-A4K) = defective - tailland - 22.08.2026

nope, deband/vsplacebo also fails like the glsl stuff above

Quote:DGDecNV

will try(switched it for future use)

RE: Filter: Line/Darken (GLSL-A4K) = defective - Selur - 22.08.2026

Okay, that is unexpected, but seems like vs-placebo isn't working on your system.
Strange,..

RE: Filter: Line/Darken (GLSL-A4K) = defective - Selur - 22.08.2026

What other programs are running?
Anything that potentially could use GLSL ? (browser, games,...)

What gpu drivers are you using?

When using:
https://www.dependencywalker.com/ (x64 version)
and loading "C:/Program Files/Hybrid/64bit/Vapoursynth/Lib/site-packages/vapoursynth/plugins2/libvs_placebo.dll" does it show any errors?

RE: Filter: Line/Darken (GLSL-A4K) = defective - Selur - 22.08.2026

Going to bed now.

Cu Selur