Glithes on the preview and in the destination file

[Selur]

Used script is:

ClearAutoloadDirs()
SetFilterMTMode("DEFAULT_MT_MODE", MT_MULTI_INSTANCE)
LoadPlugin("C:\PROGRA~1\Hybrid\64bit\Avisynth\AVISYN~1\LSMASHSource.dll")
LoadPlugin("C:\PROGRA~1\Hybrid\64bit\Avisynth\AVISYN~1\ColorMatrix64.dll")
Import("C:\Program Files\Hybrid\64bit\Avisynth\avisynthPlugins\mtmodes.avsi")
# loading source: D:\clips\new73 [2022.09.26]\1\Luisa Sonza - Melhor Sozinha.mp4
# color sampling YV12@8, matrix: bt2020ncl, scantyp: progressive, luminance scale: limited
Source = LWLibavVideoSource("D:\clips\new73 [2022.09.26]\1\Luisa Sonza - Melhor Sozinha.mp4",cache=false,format="YUV420P8", prefer_hw=0,repeat=true)
# current resolution: 3840x2160
SourceFiltered = Source
# color modifications
SourceFiltered = SourceFiltered.ColorMatrix(mode="Rec.2020->Rec.709",clamp=0,interlaced=false,hints=false)
# filtering
# scaling to 1920x1080
Source = Source.PointResize(1920,1080)
SourceFiltered = SourceFiltered.PointResize(1920,1080)
Source = Source.Histogram("levels")
SourceFiltered = SourceFiltered.Histogram("levels")
# stacking horizontal for filter preview
# adjust color to RGB32 (for preview)
SourceFiltered = SourceFiltered.ConvertToRGB32(matrix="Rec2020")
# adjust color to RGB32 (for preview)
Source = Source.ConvertToRGB32(matrix="Rec2020")
StackHorizontal(Source, SourceFiltered)
# setting output fps to 23.976fps
AssumeFPS(24000,1001)
PreFetch(6)
#  output: color sampling RGB32@8, matrix: Rec.709, scantyp: progressive, luminance scale: limited
return last

I tried to reproduce this here using:

ClearAutoloadDirs()
SetFilterMTMode("DEFAULT_MT_MODE", MT_MULTI_INSTANCE)
LoadPlugin("I:\Hybrid\64bit\Avisynth\AVISYN~1\LSMASHSource.dll")
LoadPlugin("I:\Hybrid\64bit\Avisynth\AVISYN~1\ColorMatrix64.dll")
Import("I:\Hybrid\64bit\Avisynth\avisynthPlugins\mtmodes.avsi")
# loading source: G:\TestClips&Co\files\MPEG-4 H.264\4k\4k_sample_4096x2160.mp4
# color sampling YV12@8, matrix: bt2020ncl, scantyp: progressive, luminance scale: limited
Source = LWLibavVideoSource("G:\TestClips&Co\files\MPEG-4 H.264\4k\4k_sample_4096x2160.mp4",cache=false,format="YUV420P8", prefer_hw=0,repeat=true)
# current resolution: 4096x2160
SourceFiltered = Source
# color modifications
SourceFiltered = SourceFiltered.ColorMatrix(mode="Rec.2020->Rec.709",clamp=3,interlaced=false,hints=false)
# filtering
# scaling to 1920x1080
Source = Source.PointResize(1920,1080)
SourceFiltered = SourceFiltered.PointResize(1920,1080)
Source = Source.Histogram("levels")
SourceFiltered = SourceFiltered.Histogram("levels")
# stacking horizontal for filter preview
# adjust color to RGB32 (for preview)
SourceFiltered = SourceFiltered.ConvertToRGB32(matrix="Rec2020")
# adjust color to RGB32 (for preview)
Source = Source.ConvertToRGB32(matrix="Rec2020")
StackHorizontal(Source, SourceFiltered)
# setting output fps to 25.000fps
AssumeFPS(25,1)
PreFetch(16)
#  output: color sampling RGB32@8, matrix: Rec.709, scantyp: progressive, luminance scale: limited
return last

But here everything is fine.
=> Can't reproduce this. No clue what is causing this.
Can you share a short sample of your source which allows reproducing the issue?

Glithes on the preview and in the destination file

if the preview is broken it's to be expected that a reencode is too

Cu Selur