Please, dowlnload the original, high-quality version:
I was shooting footage for my landscape video in Gyomaendrőd, Hungary. After copying the files at home, I could notice an object crossing the sky on one of the clips. As you can clearly see, sensor dust is not moving. While we might have the illusion of that, when zoomed in, basically I am just panning my camera on a fluid head.
Question - what's on the video?