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.

In: 8653

29 Answers

Anonymous 0 Comments

let’s establish some constants:

30fps video at 10 minute length is 18,000 total frames.

125% faster playback is 37.5fps — 18,000 frames / 37.5fps / 60 = 8 minutes. 8 is 80% of 10, so 20% slower

150% is 45fps — 18,000 / 45 / 60 = 6.667 minutes which is 66.6% of 10 minutes or 33% slower

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