Changing the speed of a clip, Final Cut vs After Effects
Final Cut Pro (FCP) and After Effects (AE) both allow you to change the speed of a clip but the way they do it is slightly different.
Final Cut Pro
When working in FCP the easiest way of changing the speed is by right clicking on a clip in your timeline and selecting ‘speed’. Once the dialogue box pops up you change the speed by plugging a number into the percent box. Changing the number to 200% doubles the speed of the clip. Changing the number of 50% halves the speed.
In AE they don’t have a “speed” tool, they have a “time stretch” tool which works in reverse compared to FCP. The time stretch tool can be found by right clicking a layer, time > time stretch.
The larger the number you plug in, the longer the clip will be. This is the reverse of how FCP handles it.
Switching from FCP to AE
It is common to want to change the speed of a clip in AE because it renders better than FCP can. So what do you enter into AE if you know the speed of the clip in FCP?
Let’s say your clip in FCP has had a speed increase to 142%, you move the decimal over 2 spaces (1.42) and divide 100 by that number. E.G.
FCP Clip speed = 142%
142 > 1.42
100/1.42 = 70.42
So you plug 70.42% into the AE time stretch tool to achieve the same speed you would if you entered 142% into FCP.