Muxing interlaced video

[Selur]

"Avisynth preview" working normally

good

"Preview" with checked box "No Avisynth during Preview' working normally

good

with uncheck this - preview stretched vertically.

Okay,... looking at the avisynth script of the debug output:

LoadPlugin("C:\PROGRA~1\Hybrid\32bit\AVISYN~1\LoadDll.dll")
LoadPlugin("C:\PROGRA~1\Hybrid\32bit\AVISYN~1\FFT3DFilter.dll")
LoadPlugin("C:\PROGRA~1\Hybrid\32bit\AVISYN~1\MosquitoNR.dll")
LoadDLL("C:\PROGRA~1\Hybrid\32bit\AVISYN~1\libfftw3f-3.dll")
LoadCPlugin("C:\PROGRA~1\Hybrid\32bit\AVISYN~1\ffms2.dll")
SetFilterMTMode("DEFAULT_MT_MODE", MT_MULTI_INSTANCE)
# loading source: D:\clips\new10\aspect\2\brak\Slipping Through My Fingers.mov
#  input color sampling YUY2
#  input luminance scale pc
Source = FFVideoSource("D:\clips\new10\aspect\2\brak\Slipping Through My Fingers.mov",cachefile="C:\Users\Orion\AppData\Local\Temp\mov_39e335b2bddc0b43a82621e59a460eae_853323747_1_0.ffindex",fpsnum=25,colorspace="YUY2")
# current resolution: 768x576
SourceFiltered = Source
SourceFiltered = SourceFiltered.AssumeFrameBased().SeparateFields()
# cropping to 762x480
SourceFiltered = SourceFiltered.Crop(4,46,-2,-50)
# current resolution: 762x480  (SourceFiltered)
Source = Source.AssumeFrameBased().SeparateFields()
Source = Source.Crop(4,46,-2,-50)
# current resolution: 762x480  (Source)
# filtering
# color modifications
SourceFiltered = SourceFiltered.Tweak(sat=0.30,startHue=305,endHue=15)
SourceFiltered = SourceFiltered.Levels(22,1.00,255,0,215)
# denoising using fft3dfilter
SourceFiltered = SourceFiltered.FFT3DFilter(sharpen=0.80,interlaced=true)
# deringing using MosquitoNR
SourceFiltered = SourceFiltered.MosquitoNR()
# scaling
Source = Source.Spline36Resize(762,480)
# current resolution: 762x480
Source = Source.Weave()
SourceFiltered = SourceFiltered.Spline36Resize(762,480)
SourceFiltered = SourceFiltered.Weave()
# stacking horizontal for filter preview
SourceFiltered = SourceFiltered.ConvertToRGB32(matrix="PC.709")
Source = Source.ConvertToRGB32(matrix="PC.709")
StackHorizontal(Source, SourceFiltered)
PreFetch(2)
return last

Probably related to the weave, resize, crop and filter combination,the YUY2 colorspace.
My guess is that the preview is correct if you use an Avisynth deinterlacer.
-> use a deinterlacer, try whether this is related to one of the filters you used.

Cu Selur