mpv

$ flatpak install flathub io.mpv.Mpv
Looking for matches…
error: No remote refs found similar to ‘flathub’

$ sudo flatpak install flathub io.mpv.Mpv
Looking for matches…
error: No remote refs found similar to ‘flathub’

$ sudo flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

$ sudo flatpak install flathub io.mpv.Mpv
Looking for matches…
Required runtime for io.mpv.Mpv/x86_64/stable (runtime/org.freedesktop.Platform/x86_64/21.08) found in remote flathub
Do you want to install it? [Y/n]: y

io.mpv.Mpv permissions:
    ipc       network       pulseaudio            wayland
    x11       devices       file access [1]       bus ownership [2]

    [1] /tmp, host:ro, xdg-pictures, xdg-run/pipewire-0:ro, xdg-videos,
        ~/.var/app/io.mpv.Mpv/config/mpv/scripts:create
    [2] org.mpris.MediaPlayer2.mpv.*


        ID                                   Branch Op Remote  Download
 1.     io.mpv.Mpv.Locale                    stable i  flathub  < 47.0 kB (partial)
 2.     org.freedesktop.Platform.GL.default  21.08  i  flathub < 131.3 MB
 3.     org.freedesktop.Platform.Locale      21.08  i  flathub < 325.8 MB (partial)
 4.     org.freedesktop.Platform.VAAPI.Intel 21.08  i  flathub  < 11.8 MB
 5.     org.freedesktop.Platform.openh264    2.0    i  flathub   < 1.5 MB
 6.     org.freedesktop.Platform             21.08  i  flathub < 200.3 MB
 7.     io.mpv.Mpv                           stable i  flathub  < 28.3 MB

Proceed with these changes to the system installation? [Y/n]: