Speed ramp

Full motion specification

How the movement works

To slow down only the key part of an action while keeping the lead-in quick.

1. 01Camera: completely fixed (height 1.3 m); only the playback speed changes
2. 02Playback speed: 2.4× → 0.25×; the change takes 0.7 s (1.2 s to 1.9 s) with a quadratic ease-in-out (about cubic-bezier(0.45,0,0.55,1))
3. 03Subject: a person 8 m away runs from 6 m left toward the right; x = -6 + footage time × 2.0 m; they close in quickly during the fast section
4. 04Jump: a parabola while x is between -1.5 m and 2.5 m, peak 0.99 m, arms raised; take-off at about 0.94 s, most of the airtime plays in slow motion, landing at about 3.68 s
5. 05Graph: a 120×40 px speed curve at bottom left with a blue dot (radius 5 px) at the current time
6. 06Return: stops at 4.2 s, then cross-fades back over the last 0.5 s; top-right readout shows the rate (×2.4 → ×0.3)