Why does watching a video at 1.25 speed decrease the time by 20%? And 1.5 speed decreases it by 33%?

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I guess this reveals how fucking dumb I am. I can’t get the math to make sense in my head. If you watch at 1.25 speed, logically (or illogically I guess) I assume that this makes the video 1/4 shorter, but that isn’t correct.

In short, could someone reexplain how fractions and decimals work? Lol

Edit: thank you all, I understand now. You helped me reorient my thinking.

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29 Answers

Anonymous 0 Comments

Fractions make this easier. If you play it at 5/4 speed it takes 4/5 the time.

The math is (number of frames) = (speed in frames per second) * (time in seconds)

The number of frames doesn’t change, so if you multiply either speed or time by a fraction, you have to multiply the other by the reciprocal of the fraction to cancel it out.

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