artifacts when previewing

[Selur]

Looking at the preview script:

ClearAutoloadDirs()
SetFilterMTMode("DEFAULT_MT_MODE", MT_MULTI_INSTANCE)
LoadPlugin("C:\PROGRA~1\Hybrid\32bit\AVISYN~1\LSMASHSource.dll")
LoadPlugin("C:\PROGRA~1\Hybrid\32bit\AVISYN~1\SmoothAdjust.dll")
# loading source: D:\!_Video\Video_Mus\!_Edit\Nelli - Gde voda_1.67x_1280x720_amqs-1.mov
# color sampling YUY2@10, matrix: bt709, scantyp: progressive, luminance scale: limited
Source = LWLibavVideoSource("D:\!_Video\Video_Mus\!_Edit\Nelli - Gde voda_1.67x_1280x720_amqs-1.mov",cache=false,format="YUV422P16", prefer_hw=0,repeat=true)
# current resolution: 1280x720
# filtering
# color modifications
SourceFiltered = Source
SourceFiltered = SourceFiltered.SmoothLevels16(input_low=8995,input_high=47545,output_high=60395,chroma=30,Lmode=2,Ecenter=32896,HQ=true)
Source = Source.ColorYUV(analyze=true)
SourceFiltered = SourceFiltered.ColorYUV(analyze=true)
# stacking horizontal for filter preview
# adjust color to RGB32 (for preview)
SourceFiltered = SourceFiltered.ConvertToRGB32(matrix="Rec709")
# adjust color to RGB32 (for preview)
Source = Source.ConvertToRGB32(matrix="Rec709")
StackHorizontal(Source, SourceFiltered)
PreFetch(6)
# setting output fps to 25.000fps
AssumeFPS(25,1)
#  output: color sampling RGB32@16, matrix: bt709, scantyp: progressive, luminance scale: limited
return last

and your image I would say those 'artifacts' are the output of you eanbleding 'ColorYUV(analyze=true)'.

Cu Selur