Crash in AVC encoding pass 1

[Selur]

General comment: It's usually a bad idea to mix FFmpeg and Vapoursynth/Avisynth filtering.

Only visible error is:

x264 output: y4m [error]: bad sequence header magic
x264 [error]: could not open input file `-'

which usually means that something went wrong with the filtering/decoding.

Looking at the debug output:
Vapoursynth script used:

# Imports
import vapoursynth as vs
core = vs.get_core()
# Loading Plugins
core.std.LoadPlugin(path="C:/Program Files/Other/Hybrid/64bit/vsfilters/DeinterlaceFilter/TDeintMod/TDeintMod.dll")
core.std.LoadPlugin(path="C:/Program Files/Other/Hybrid/64bit/vsfilters/SourceFilter/LSmashSource/vslsmashsource.dll")
# source: 'S:\video\Rips\Music\James Taylor - Squibnocket (2006)\title_t00.mkv'
# current color space: YUV420P8, bit depth: 8, resolution: 720x576, fps: 25, color matrix: 470bg, yuv luminance scale: limited, scanorder: top field first
# Loading S:\video\Rips\Music\James Taylor - Squibnocket (2006)\title_t00.mkv using LWLibavSource
clip = core.lsmas.LWLibavSource(source="S:/video/Rips/Music/James Taylor - Squibnocket (2006)/title_t00.mkv", format="YUV420P8", cache=0, prefer_hw=0)
# making sure input color matrix is set as 470bg
clip = core.resize.Point(clip, matrix_in_s="470bg",range_s="limited")
# making sure frame rate is set to 25
clip = core.std.AssumeFPS(clip=clip, fpsnum=25, fpsden=1)
# Setting color range to TV (limited) range.
clip = core.std.SetFrameProp(clip=clip, prop="_ColorRange", intval=1)
# Deinterlacing using TDeintMod
clip = core.tdm.TDeintMod(clip=clip, order=0)
# cropping the video to 688x560
clip = core.std.CropRel(clip=clip, left=16, right=16, top=8, bottom=8)
# set output frame rate to 25.000fps
clip = core.std.AssumeFPS(clip=clip, fpsnum=25, fpsden=1)
# Output
clip.set_output()

seems fine to me.

Looking at the encoding call:

"C:\Program Files\Other\Hybrid\64bit\Vapoursynth\vspipe.exe" "C:\Users\colin\AppData\Local Temp\encodingTempSynthSkript_2020-12-30@00_14_03_0010.vpy" - --y4m |  "C:\Program Files\Other\Hybrid\64bit\ffmpeg.exe" -y -loglevel fatal -noautorotate -nostdin -threads 8 -f yuv4mpegpipe -i - -an -sn -vf hqdn3d=5:4:7:6,deshake=x=-1:y=-1:w=-1:rx=-1:ry:-1:egde=16:blocksize=16:contrast=mirror:search=8,unsharp=7:7:1.00:7:7:1.00,zscale=rangein=tv:range=tv -pix_fmt yuv420p -vsync 0  -f yuv4mpegpipe -
2 | "C:\Program Files\Other\Hybrid\64bit\x264.exe" --preset veryfast --pass 1 --bitrate 2000 --profile high --level 4.1 --sync-lookahead 1 --qcomp 0.8 --rc-lookahead 40 --ipratio 1.1 --pbratio 1.1 --qpmax 51 --no-dct-decimate --weightp 2 --aq-strength 0.5 --deadzone-inter 6 --deadzone-intra 6 --sar 16:15 --qpfile "C:\Users\colin\AppData\Local\Temp\title_t00_2020-12-30@00_14_03_0010_05.qp" --deblock -2:-2 --non-deterministic --range tv --stats "C:\Users\colin\AppData\Local\Temp\title_t00_2020-12-30@00_14_03_0010_06.stats" --demuxer y4m  --input-range tv --fps 25/1 --output-depth 8 --output NUL -

I don't see any mistake directly, but my guess is that it's the deshake filter.

-> will do some testing and report back

Cu Selur