What are the names of video files that weigh max 4kb?

Question

C++ / C#

Hello! I remember it for a long time. I watched the video, house theory, it takes 4 minutes, it weighed like 4kb. But there is music, the video is also impressive. They said that this is purely program code. Maybe you know what it's about, tell me.

Answer 1

Demoscene 4k
Demo 4k
Demos The
whole world.

Answer 2

Definitely not 4kb it weighed.