thewiru wrote:

I reinstalled MPV and it now works, BUT sadly now i have another error:

MPV will open normally but SVP won't recognize it,  instead, on SVP's terminal, the following appears:

[lavfi] filter 'vapoursynth' not found or failed to allocate
[user_filter_wrapper] Creating filter 'vapoursynth' failed.

I had the same error, señor! I'm on an Arch-based distro, so this may be of limited help to you, but my solution was that I had to install mpv-full (from the AUR -- https://aur.archlinux.org/packages/mpv-full), not the ordinary mpv package, so get SVP to work.
Usually, I recall you want mpv-git instead of the regular mpv package, but recent changes made mpv-git unbuildable against ffmpeg, and mpv-full is safer to use.

¡Buena suerte!