A single frame of 1080p (1920x1080 pixels) contains approximately 2 million pixels. With standard color depth (24-bit), that’s about 6 megabytes per frame . At 24 frames per second, a 90-minute movie would occupy roughly of raw data.

A 300MB 1080p movie, therefore, represents a compression ratio of nearly .

Don't just download the smallest file. Match the resolution to your situation.

Why 300MB specifically? This is the "magic number" for mobile users. A 300MB movie at 480p is small enough to download via mobile data without destroying your monthly cap, yet watchable enough for a daily commute.

You are not watching a movie. You are watching a spectrogram with pictures.