[BUG] Progress bar and Encoding speed is wrong

[Selur]

encoding call:

"C:\PROGRA~1\Hybrid\32bit\ffmpeg.exe" -y -loglevel fatal -noautorotate -threads 8 -i "D:\Hybird\encodingTempSynthSkript_03_29_10_5410.avs" -an -sn -vf zscale=rangein=tv:range=tv -pix_fmt yuv420p -vsync 0  -f rawvideo - | "C:\PROGRA~1\Hybrid\64bit\x264.exe" --preset veryslow --crf 22.00 --profile high --level 4.1 --ref 4 --vbv-maxrate 62500 --vbv-bufsize 78125 --sar 1:1 --non-deterministic --range tv --colormatrix bt709 --demuxer raw --input-res 1920x1080 --input-csp i420 --input-range tv --input-depth 8 --fps 24000/1001 --output-depth 8 --output "D:\Hybird\03_29_10_5410_03.264" -

looks fine to me.
The Avisynth script:

LoadCPlugin("C:\PROGRA~1\Hybrid\32bit\AVISYN~1\ffms2.dll")
LoadPlugin("C:\PROGRA~1\Hybrid\32bit\AVISYN~1\flash3kyuu_deband.dll")
SetFilterMTMode("DEFAULT_MT_MODE", MT_MULTI_INSTANCE)
# loading source: G:\00017.mkv
#  input color sampling YV12
#  input luminance scale tv
FFVideoSource("G:\00017.mkv",cachefile="D:\Hybird\03_29_10_5410.ffindex",fpsnum=24000,fpsden=1001)
# current resolution: 1920x1080
# filtering
# debanding
f3kdb(dither_algo=3,grainY=64,grainC=64,dynamic_grain=false,Y=64,Cb=64,Cr=64)
PreFetch(4)
return last

looks fine too.
RAM usage shouldn't be that high to cause problems.
Tried to replicate the issue here, but for me everything worked as it should

So,
1. does the Avisynth Preview work properly or does it show errors.
2. what happens if you call the encoding call from above inside a Windows Command Prompt?

Cu Selur