[HELP] SCU-Net finishing within seconds

[Smiggy]

Hello Selur,

Before I reset my PC due to a crash, these settings (see pictures from link) were fine, but ever since, SCUNet finishes in seconds and outputs downsized files.

See video to see what I mean and for the settings.

https://limewire.com/d/rIQ1N#EMupEYXg6S

[Selur]

for the future: read the sticky, create a debug output
About your issue:

1. it's normal that SCUNet is faster on follow-up files if the resolution of the input that SCUNet is fed doesn't change, since it'll create an .engine file in the first run which it can reuse. (engine files usually only depend on the input resolution and the SCUNet settings, so if you feed SCUNet multiple files with the same resolution an SCUNet settings, the engine file only has to be created once)
2. about the resizing. Your Input has a 8:9 Input PAR (I assume this is correct) and you tell Hybrid to adjust the size so that the height stays the same and the output has a PAR or 1:1. For this, the width needs to be adjusted to 720*8/9 = 640. Alternatively you could tell Hybrid to adjust the height instead and keep for example a width of 720, then Hybrid would resize the height to 480*9/8= 540. This has nothing to do with SCUNet.
3. If your reset somehow damaged existing .engine files, you could delete them. You can find these wherever your 'Default Engine Path'- or, if it's not set your, 'Default Temp Path'-folder is located. (see Config->Paths). SCUNet will recreate them if they do not exist.


Cu Selur

[Smiggy]

Hi Selur,

Apologies. Some files attached for you to review and the actual debug file can be downloaded here because it was too big to attach.

https://limewire.com/d/nbL3t#qtRlUnM6Cs

These files that are being put through SCUNet are 1GB files and 20 minutes in length. These settings worked before I reset my PC and it would take 36 mnutesd to complete one file at 16.00FPS.

The issue is elsewhere.

[Selur]

on my way to work, atm.
with 20min files the encoding should take longer
=> try clearing your engine/tmp folder

[Smiggy]

I'll try that, if you can have a closer look when time permits.

[Selur]

Does the Vapoursynth preview work? Remember the start of the preview might take a while until the engine file gets created.

[Selur]

I looked at the debug output, Vapoursynth script seems okay:

And aside that I would recommend moving the temp folder, the encoding call:

"C:\Program Files\Hybrid\64bit\Vapoursynth\vspipe.exe" "C:\Users\User\AppData\Local\Temp\encodingTempSynthSkript_2025-08-27@04_50_42_2854_0.vpy" - --outputindex 0 -c y4m | C:\Program Files\Hybrid\64bit\ffmpeg.exe" -y -noautorotate -nostdin -threads 8 -color_primaries bt470m -color_trc smpte170m -colorspace bt470bg -color_range tv -f yuv4mpegpipe -i - -an -sn -color_primaries bt470m -color_trc smpte170m -colorspace bt470bg -color_range tv -pix_fmt yuv422p10le -strict -1 -fps_mode passthrough -vcodec prores_ks -profile:v 1 -vtag apcs -metadata encoding_tool="Hybrid 2025.07.27.1" -aspect 640:480 -f mov "C:\Users\User\AppData\Local\Temp\5 - Roll For it_5_2025-08-27@04_50_42_2854_03.mov"

looks fine too.
FFMmpeg reports:

ffmpeg version N-120379-g29368ccb48 Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 15.1.0 (Rev8, Built by MSYS2 project)
  configuration:  --pkg-config=pkgconf --cc='ccache gcc' --cxx='ccache g++' --ld='ccache g++' --extra-cxxflags=-fpermissive --extra-cflags=-Wno-int-conversion --disable-autodetect --enable-amf --enable-bzlib --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv --enable-lzma --enable-nvenc --enable-zlib --enable-sdl2 --enable-ffnvcodec --enable-nvdec --enable-cuda-llvm --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libdav1d --enable-libaom --disable-debug --enable-fontconfig --enable-libass --enable-libbluray --enable-libfreetype --enable-libharfbuzz --enable-libmfx --enable-libmysofa --enable-libopenjpeg --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libwebp --enable-libxml2 --enable-libzimg --enable-libshine --enable-gpl --enable-avisynth --enable-libxvid --enable-libopenmpt --enable-librav1e --enable-libsrt --enable-libgsm --enable-libvmaf --enable-libsvtav1 --enable-libglslang --enable-vulkan --enable-liboapv --extra-cflags=-DLIBTWOLAME_STATIC --extra-cflags=-DLIBXML_STATIC --extra-libs=-liconv --disable-w32threads
  libavutil      60.  6.100 / 60.  6.100
  libavcodec     62.  8.100 / 62.  8.100
  libavformat    62.  1.103 / 62.  1.103
  libavdevice    62.  0.100 / 62.  0.100
  libavfilter    11.  3.100 / 11.  3.100
  libswscale      9.  0.100 /  9.  0.100
  libswresample   6.  0.100 /  6.  0.100

Input #0, yuv4mpegpipe, from 'fd:':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: rawvideo (Y3[10][10] / 0xA0A3359), yuv422p10le(progressive), 640x480, 23.98 fps, 23.98 tbr, 23.98 tbn

Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> prores (prores_ks))

[vf#0:0 @ 000000000297c2c0] No filtered frames for output stream, trying to initialize anyway.

Output #0, mov, to 'C:\Users\User\AppData\Local\Temp\5 - Roll For it_5_2025-08-27@04_50_42_2854_03.mov':
  Metadata:
    encoding_tool   : Hybrid 2025.07.27.1
    encoder         : Lavf62.1.103
  Stream #0:0: Video: prores (LT) (apcs / 0x73637061), yuv422p10le(progressive), 640x480 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 23.98 fps, 24k tbn
    Metadata:
      encoder         : Lavc62.8.100 prores_ks

2025.08.27 - 04:51:29_Windows 11 Version 24H2 (64bit)_2025.07.27.1 - level 9: FFmpeg output: [out#0/mov @ 0000000002972e40] video:0KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown
[out#0/mov @ 0000000002972e40] Output file is empty, nothing was encoded(check -ss / -t / -frames parameters if used)
frame=    0 fps=0.0 q=0.0 Lsize=       0KiB time=N/A bitrate=N/A speed=N/A elapsed=0:00:00.00

and stops without an error.
=> Did you try what I suggested? Does the Vapoursynth Preview work?

Cu Selur

[Smiggy]

Hi Selur,

How do you check if the Vapousynth preview is working? 

Sorry, I'm a rookie when it comes to Hybridm

[Selur]

How are you using Hybrids Vapoursynth filters Are you using them blindly?
You should always check the effect of filters.
In the 'Filtering->Vapoursynth', in the right lower corner, is the normal Vapoursynth Preview button, if you press it Hybrid will open a vsViewer Window which will show what the current Vapoursynth filter settings will do.
If you enable 'Compare View' and press the Vapoursynth Preview icon, the vsViewer Window will show the input and output of the filtering.'
If you enable 'Synth auto refresh' each change will cause the Preview to refresh. (read the tool tips)
You can also enhance/adjust the Preview by using the settings under Filtering->Vapoursynth->Misc->Preview (I especially recommend checking the 'Split Compare View' options, when using 'Compare view'.)

If that Preview does not work, properly, neither will the encoding.

Cu Selur

Ps.: If you see a button, check the tool-tip info. Especially at the beginning, you should play around with settings and read the tool-tips.

[Smiggy]

Hello,

A trusted and experienced user (tailland) providing the settings for me. I just add the settings and run them, but he of course, he can help me diagnose technical faults to a certain extent.

Please watch this video - the preview doesn't work.

https://limewire.com/d/ekkza#HXtvCmWsU8