Online playlists (streaming) not working

[rvm]

What Linux distro are you using?

[epoch]

Arch.

[rvm]

Can you send the mplayer log (menu View) after playing a video? I just want to know which video output is mplayer using.

[epoch]

Logs: https://pastebin.com/raw/HW6Yu6eV

This is the default (I removed the config directory and run smplayer for the first time, so it's using mpv).

BTW, when starting from the console, it says: "Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway." If I do as the message says, it gives me this error: https://pastebin.com/raw/7bhbbRpk

(EDIT: previous edit removed, I was inadvertently testing with mplayer instead of mpv)

[rvm]

According to the log, mplayer is using xv. Isn't this video output available in mpv? Doesn't it work?

[epoch]

Yes, it's available. I've tried it and it works!
Thanks.