Does NASA supply the eerie music?
Looks like a star or planet starting to dip below the horizon as the ISS moves away from it in its orbit.
Thats no planet...its a space station! There will only be ONE flash.
Bingo! Anyone who has spent any amount of time watching the ISS 24/7 live feed knows that the view regularly cycles through three cameras, viz reverse wide angle and reverse narrow angle, below or Earthward, and forward view. The brighter planets after orbital sunset and prior to orbital sunrise, including the Moon, are frequent backdrops to the nearly always spectacular views fore and aft. The views through the ~47 minute nightside is (wait for it) dark, or the 'temporary interruption' test pattern is shown on the feed, and the test pattern is always shown whenever the downlink is interrupted for more than a few seconds, as happens every time the mostly automated system cycles between cameras.
The straight feed is without audio. Only the YouTube rip off is fed to noobs for eyeball counts and advertising revenue, with orchestration.
The loop of this latter feed shown by the histrionic Mirror is almost certainly a reverse angle post-orbital sunset view, from over the southern hemisphere, showing Jupiter following after the Sun behind Earth. That fits the orientation of Earth-Sun and Jupiter in recent weeks.