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  • the lock tends to be based on user inactivity. don't think there's anything special about a video.
    VLC has an option to disable screensaver during playback, so presumably it mimics some user interaction

  • presumably it mimics some user interaction

    Nah, just sets a variable. Any video player should be able to do that, and theoretically a browser could do it too when it detects a video stream, but there are reasons not to (e.g. annoying autoplay video on browser windows you've left open)

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