media/multimedia/ VlcRemote

There is an excellent Android/iOS app (though it costs £5.99 to unlock all features, and I've only tried Android): https://vlcmobileremote.com/

For control via web: In preferences, enable web. (It is easy to google for this bit. Basically look in preferences→all→interface.) You set a password. The username is blank, when the web browser asks for it.

Now, if you want to connect from another machine, you need to edit the .hosts file. This is found in:

• Windows – C:\Program Files\VideoLAN\VLC\lua\http
• macos – /Applications/VLC.app/Contents/MacOS/share/lua/http/.hosts
• Linux – /usr/share/vlc/lua/http/.hosts

If, like me, you live alone and so aren't worried about security, just make this .hosts file contain:

::1
127.0.0.1
0.0.0.0/0

The 0.0.0.0/0 line makes it wide open: any machine that can access the host on port 8080 can control Vlc. You have been warned.

Now connect, via a browser, on port 8080, that is http://mymachine:8080/ and use a blank username and the password set in preferences.