The sound would be heavily distorted, robotic, or completely absent.
The behind video bitrate calculations
Viewers will immediately notice severe visual artifacts. Macroblocking—where the image breaks apart into large, visible pixel squares—becomes rampant, especially during fast-moving action scenes. Color banding occurs because the color depth is stripped down, turning smooth gradients like sunsets into harsh blocks of distinct color. Fine details, such as facial textures, individual strands of hair, or background text, are completely erased, replaced by a soft, muddy blur. Why the Demand Persists highly compressed movies 10 mb link