SMOKESCREEN on rtmp stream

[j_cool]

This can be seen on paid-for streams so I won't name the websites.

On one website top-half ot the stream is clear, while bottom-half of the stream is cloudy.

Work of art.

I am interested in technical side of this and could not find any tutorial
or reading at all about how this smokescreen is created or removed.

I can think of this forum as the only place where I can discuss about this topic.

I looked into FFMPEG help file and could not find something about that
smokescreen, answer may be there.

I can save that type of stream but doubt that smokescreen can be removed at that point, or some real-life Wizard can.