At 5 Mbps, fine details (the VHS tape texture, the organic ooze of the "Videodrome" tumor, the pores on Max Renn’s sweating face) are discarded. The algorithm decides that a blurry gradient is cheaper to store than a sharp grain field.
Cronenberg was decades ahead of his time. In 1983, he predicted: The "Global Village" as a cult: Videodrome.1983.2160p.BluRay.3500MB.DDP2.0.x264...