[BUG] Vapoursynth stopped working in latest dev build (crashes)

[The_Tinkerer]

I'm on a GPU-less machine. No Nvidia drivers. Perhaps that's the issue.

Replaced DGDecode.dll with version 2.0.0.5 in C:\Program Files\Hybrid\64bit\vsfilters\SourceFilter\d2vSource.

Cleared "Use DGDecNV when available" check box under Filtering -> Vapoursynth -> Misc -> Source. (It is now enabled by default; in Hybrid 2020.04.15.1 is was not.)

Output now works.

However, the Vapoursynth previewer still crashes.

It's not my buggy source file, it happens on any file, including an mp4 file encoded with Hybrid.

I saved the VapourSynth script file as .vpy.

I ran the Vapoursynth previewer directly and opened the vpy file. I received a log message, "Failed to initialize Vapoursynth."

After some troubleshooting, I got vsviewer.exe to produce this error message:



In Hybrid version 2021.05.25, Python has been updated to version 3.9. This version of Python is Windows 10 only:

https://bugs.python.org/issue40740
https://github.com/vapoursynth/vapoursynth/issues/677

I tried to see if it was possible to roll Python back to version 3.8 for Hybrid version 2021.05.25, but was unsuccessful.

I guess that's the end of Vapoursynth previewer on Windows 7, and probably Vapoursynth as well because I didn't test it extensively with other filters and such.

I suppose Windows 7 could only last so long!