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Digital Video: Simple Definition

Digital video is a sequence of photographs (frames) displayed in rapid succession to create the illusion of movement. Just like a flipbook, when individual still images are shown fast enough, the human eye perceives smooth motion.

Standard video plays 24, 30, or 60 frames per second (fps). At 30fps, a 1-minute video contains 1,800 individual image frames. Without compression, this would be enormous - that's why video codecs like H.264 and H.265 are essential.

How Digital Video Works

Modern video codecs do not store every frame as a complete image. They store a full frame (keyframe) and then only the differences between that frame and subsequent frames. A static background only needs to be stored once, not in every frame.

This temporal compression is why a 10-minute video in H.264 might only be 500MB when the raw uncompressed frames would be 100GB+. The codec's efficiency directly determines the trade-off between file size and quality.

Examples of Digital Video