Chainik wrote:

check the configure step output - if vapoursynth is enabled

What do you mean by that?

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.
Chainik wrote:

this's because you built mpv w/o lua installed
see 'liblua5.2-dev' package

I do have it installed, though.
As for my mpv version, it is mpv 0.29.0-306-g4e9dc60d9e.

https://i.imgur.com/s1hLWzP.png

Chainik wrote:

Operating system, mpv version?

Ubuntu 18.10
As for MPV, it may be relevant to say that i followed this post when installing it.

When i try to use the "Open file with MPV" option, nothing happens but the following message on my terminal

Error parsing option no-ytdl (option not found)
Setting commandline option --no-ytdl= failed.

Exiting... (Fatal error)

What should i do?