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When I press the "Preview" button, preview window appears and immediatelly closed

Seems like you used the 'Vapoursynth Preview', not the 'Preview'-button.
Script:

Code:
# Imports

import vapoursynth as vs

# getting Vapoursynth core

import sys

import os

core = vs.core

# Import scripts folder

scriptPath = 'D:/!_System/Hybrid/64bit/vsscripts'

sys.path.insert(0, os.path.abspath(scriptPath))

# loading plugins

core.std.LoadPlugin(path="D:/!_System/Hybrid/64bit/vsfilters/ResizeFilter/nnedi3/vsznedi3.dll")

core.std.LoadPlugin(path="D:/!_System/Hybrid/64bit/vsfilters/Support/fmtconv.dll")

core.std.LoadPlugin(path="D:/!_System/Hybrid/64bit/vsfilters/SourceFilter/LSmashSource/LSMASHSource.dll")

# Import scripts

import edi_rpow2

import validate

# Source: 'H:\!_Video\Video_Mus\Vanessa Mae\1995-2005\Vanessa Mae - Destiny.avi'

# Current color space: YUV420P8, bit depth: 8, resolution: 336x280, frame rate: 25fps, scanorder: progressive, yuv luminance scale: limited, matrix: 470bg, format: divx3

# Loading 'H:\!_Video\Video_Mus\Vanessa Mae\1995-2005\Vanessa Mae - Destiny.aviÄ using LWLibavSource

clip = core.lsmas.LWLibavSource(source="H:/!_Video/Video_Mus/Vanessa Mae/1995-2005/Vanessa Mae - Destiny.avi", format="YUV420P8", stream_index=0, cache=0, prefer_hw=0)

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.

clip = core.std.SetFrameProps(clip=clip, _ColorRange=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: progressive)

clip = core.std.SetFrameProps(clip=clip, _FieldBased=vs.FIELD_PROGRESSIVE) # scan type: progressive

clip = core.std.Crop(clip, left=0, right=2, top=34, bottom=34) # cropping to 334x212

clip = core.std.AddBorders(clip=clip, left=0, right=2, top=0, bottom=0) # add borders to archive mod 4 (NNEDI3(CL)) - 336x212

# resizing using ZNEDI3

# current: 336x212 target: 336x190 -> pow: 2

clip = edi_rpow2.nnedi3_rpow2(clip, rfactor=2) # 672x424

clip = core.std.Crop(clip=clip, left=0, right=4, top=0, bottom=0) # removing added borders from mod requirement (NNEDI3(CL)) -  668x424

# resizing 668x424 to 336x190

clip = core.fmtc.resample(clip, w=336, h=190, kernel="spline64", interlaced=False, interlacedd=False) #  before YUV420P8 after YUV420P16

# adjusting output color from YUV420P16 to YUV420P8 for x264Model

clip = core.resize.Bicubic(clip=clip, format=vs.YUV420P8)

# set output frame rate to 25fps (progressive)

clip = core.std.AssumeFPS(clip=clip, fpsnum=25, fpsden=1)

# output

clip.set_output()

seems okay. I suspect that LWLibavSource can't decode divx3 (which never followed a standard).
Using 'FFmpegSource2' might work. Try disabling 'Prefer LWLibavSource over FFMpegSource2'. If that also doesn't help you could try whether BestSource can handle such a file (which I doubt). If you have a VFW decoder fr divx3 using AviSource might work.

Cu Selur

None of the methods helped.

Then there isn't a Vapoursynth source filter that can handle your source.
=> Nothing I can do about it.
(only DivX3 file I still got is inside an ogm container, which BestSource decodes without problems)

Cu Selur

kingcrimsonster

Selur

kingcrimsonster

Selur