To speed up a video on your iPhone, you can use iMovie or the Photos app. You can adjust the speed of a video in iMovie by using the Speed button in the video editing toolbar. You can also speed up a ...

Slo-mo is one of the coolest features of the iPhone camera. By filming at a high frame rate and then playing back the footage at a lower frame rate, the slo-mo creates emphasis on a few frames in the ...