using image sequence crashes

[Selur]

I looked at the debug output.
The encoding call:

"C:\PROGRA~1\Hybrid\64bit\VAPOUR~1\vspipe.exe" "C:\Users\deama\AppData\Local\Temp\encodingTempSynthSkript_16_38_44_0310.vpy" - --y4m | "C:\PROGRA~1\Hybrid\64bit\x264.exe" --preset superfast --pass 1 --bitrate 1500 --profile high --level 4.1 --direct auto --b-adapt 0 --qcomp 0.5 --rc-lookahead 40 --aq-mode 0 --sar 1:1 --non-deterministic --range pc --stats "C:\Users\deama\AppData\Local\Temp\sdsd_16_38_44_0310_02.stats" --demuxer y4m --input-csp yuvj420p --fps 1/1 --output-depth 8 --output NUL -

crashed with:

y4m [error]: bad sequence header magic

which usually happens if there is a problem with the Vapoursynth script.

Looking at the Vapoursynth script:

# Imports
import vapoursynth as vs
core = vs.get_core()
# Loading Plugins
core.std.LoadPlugin(path="C:/Program Files/Hybrid/64bit/vsfilters/SourceFilter/Imagemagick/libimwri.dll")
# Loading C:\Users\deama\Desktop\files\gutsuru.png using vsImageReader
clip = core.imwri.Read(["C:/Users/deama/Desktop/files/gutsuru.png"])
clip = core.std.Loop(clip=clip, times=100)
# Input color space is assumed to be RGB24.
# making sure frame rate is set to 1/1
clip = core.std.AssumeFPS(clip, fpsnum=1, fpsden=1)
# Setting color range to PC (full) range.
clip = core.std.SetFrameProp(clip=clip, prop="_ColorRange", intval=0)
# adjusting output color from: RGB24 to YUV420P8 for x264Model (i420)
clip = core.resize.Bicubic(clip=clip, format=vs.YUV420P8, matrix_s="709", range_s="full")
# Output
clip.set_output()

The script itself looks fine.

I tried the script (adjusted the paths to use a png and the filters on my machine):

# Imports
import vapoursynth as vs
core = vs.get_core()
# Loading Plugins
core.std.LoadPlugin(path="I:/Hybrid/64bit/vsfilters/SourceFilter/Imagemagick/libimwri.dll") # adjusted the filter path to my machine
# Loading E:\sequence\ED-360-png\00001.png using vsImageReader
clip = core.imwri.Read(["E:/sequence/ED-360-png/00001.png"]) # adjusted to load my file
clip = core.std.Loop(clip=clip, times=100)
# Input color space is assumed to be RGB24.
# making sure frame rate is set to 1/1
clip = core.std.AssumeFPS(clip, fpsnum=1, fpsden=1)
# Setting color range to PC (full) range.
clip = core.std.SetFrameProp(clip=clip, prop="_ColorRange", intval=0)
# adjusting output color from: RGB24 to YUV420P8 for x264Model (i420)
clip = core.resize.Bicubic(clip=clip, format=vs.YUV420P8, matrix_s="709", range_s="full")
# Output
clip.set_output()

and everything worked fine.

-> Does the Vapoursynth Preview work properly?