someone walk me through speeding up a video on iphone?

imovie tops out at 2x. if that's still too slow, export it at 2x, import the exported file as a new project and speed that up again. ugly workaround but it works and it's free.

depends what kind of clip it is. a slo-mo, photos can handle — edit, and the little vertical bars under the filmstrip let you drag where the slow part starts and ends. a normal video it won't touch. you need imovie, free from the app store: new project, drop the clip in, tap it and there's a speed slider that goes up to 2x. share it back out as a new file rather than saving over the original.