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in fact it must be here: /usr/local/opt/vapoursynth/lib/libvapoursynth-script.0.dylib
and it will be here if you install Homebrew in a default location

Installed SVP on my Macbook running OS 10.15.7, but can't seem to get SVP running in VLC (mpv is good to go).

Tried opening a file via VLC, went SVP Menu > Utilities > SVP in VLC and it says "Please install Vapoursynth via Homebrew".
Tried using

brew reinstall vapoursynth

but still can't work.

Also Vapoursynth isn't showing up in the filters in VLC preferences, either. Tried all of the wiki and looked through forums but nothing seems to be working.