- MPRIS on Linux and SMTC on Windows through souvlaki: play/pause, next,
previous, stop and seeking from media keys and the panel widget, with
the title, episode, duration and the cached cover as a file:// URL
- the screensaver is held off while a film plays on the player page,
through the desktop portal with org.freedesktop.ScreenSaver as the
fallback, and SetThreadExecutionState on Windows. mpv's own
stop-screensaver has no window to act for under the render API
nvrl