I'm trying to upscale an mp4 to ProRes, but I'm not able to view a preview. Any suggestions?
My guess is that's a problem with MCDegrainSharp the libmvtools.dll.
Try replacing libmvtools.dll with libmvtools_old.dll or update to latest dev.
Cu Selur
I think it's a problem with the timecode. I'll try ignoring the file's timecode.
Even without any filters it is still causing the preview window to not display. Tried ignore timecode, no luck.
Clip
Just loading the source and opening the Vapoursynth preview:
dgdecodenv => works
BestSource => works
BestSource + OpenCL/Vukan/CUDA/... => works
LibavSMASHSource => works
LWLibavSource => works
LWLibavSource + ... => works
ffms2 => works
(I used latest dev)
Cu Selur
Tried the new dev version with no filters and still no preview window. I don't see a preview for any mp4 files, the wondow pops up quickly, displays just grey, then disappears.
What happens if you:
1. check the Vapoursynth script
2. open vsViewer
3. copy the content of the Vapoursynth script into it
and press F5 ?
vsViewer.exe - failed to open. Please set up the library search path in settings.
I've not seen this before.
Sounds like for some reason the Vapoursynth setup is messed up on your system,...
Did you install a global Vapoursynth or similar?
I installed Hybrid_dev_2025.07.16-19404.exe
I removed the previous install using the uninstall option first.
That's the same version I use.
Does the Vapoursynth Preview fail on any source for you, or just for mp4s?