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

1.25 speed means the video goes 1/4 faster than normal, or 5/4 its speed.

Speed of a video is frames / seconds. You want the seconds (x frame, but in reality this doesn’t matter because we are using relative speed, the total frames aren’t changing)

So we spin the fraction around, 5/4 the speed becomes 4/5 the time, or 80%

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