[Edit: Removed redundant commentary about headline.]
In: Mathematics
By only storing information when a pixel changes.
For example, a lyric video on YouTube might have a background that stays constant throughout the video, so it’s rather pointless to store it 24 times per second when you can just do it one and then only store individual pixel changes as they happen from frame to frame, like the text portion changing, while most of the pixels never change.
Similarly, movies have a lot of pixels that never change, such scenes where only actors move. Thus you only record their movement, leave the rest alone until a scene change.
Also this process is the reason why, when it bugs out, you can sometimes see moving faces in those noisy, multicoloured images.
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