How to Speed up/Slow down iPhone Video with VideoProc [with Software]
If you want to make your iPhone video play faster or slower than original speed, you can use VideoProc to edit the iPhone video playback speed up to 16X. It is a fresh desktop app that is flexible to adjust video speed like 0.1X, 0.25X, 0.5X, 2X, 4X, 8X and 16X. On top of that, it is pretty simple to do any video processing tasks, be it speed control, quality enhancement, video editing, or encoding. Just follow the steps below and learn how to speed up and slow down your iPhone Video easily.
Prior to downloading and installing VideoProc on your computer, make sure to transfer your video content from iPhone to Mac or PC first.
Step 1: Add iPhone Video to the Video Speed Controller
Launch VideoProc, click Video icon on the main interface, press +Video button to add the iPhone video from your computer hard drive. VideoProc accepts any video took from any smartphone, camera, camcorder or drone.
Step 2: Initiate Video Editing Option
Click Rotate button under the pending file to get access to the Video Edit panel.
Step 3: Adjust Video Playback Speed
At the bottom of the new panel where you will see the Playback Speed. Drag the slide bar to choose the playback speed you want to set the iPhone video to:
0.1x (slowest. 8x slower than original speed)
0.25x (slower. 4x slower than original speed)
0.5x (slow. 2x slower than original speed)
1x (normal. The original speed of video)
2x (fast. 2x faster than original speed)
4x (faster. 4x faster than original speed)
8X (faster. 8x faster than original speed)
16x (fastest. 16x faster than original speed)
You can preview the video as per your needs and then press Done.
Step 4: Choose Video Format (Optional)
At the bottom of the interface, you are allowed to choose the target format as you want. You can keep the iPhone MOV H.264 video unchanged or choose MP4 H.264 as the output format in case of wider compatibility with HDTV, gaming system, smartphone, or tablet. Note: the program has been updated to support the latest iPhone models XS and XS Max.
Step 5: Start Speeding up or Slowing down iPhone Video
Click Browse button to save the resulting file in the output folder. Press RUN button to begin the speed and video duration adjustment. With full GPU acceleration, VideoProc enables a quick video processing of any video sources.
How to Speed up/Slow Down a Video on iPhone with iMovie [with iOS App]
iOS users get accustomed to using iMovie to do some basic edits on iPhone without downloading any third-party software. If you want to increase and decrease your video speed on iPhone but don't know how to do with iMovie, just check the iMovie tutorial below.
Step 1: Launch iMovie app and open your project.
Step 2: tap the iPhone clip in the timeline to reveal the inspector.
Step 3: Press the Speed button at the bottom.
Step 4: Drag the slider bar right to the rabbit-shaped icon to speed up the video or move the slider left to the turtle-shaped icon to slow down the iPhone video.
Step 5: Click Done and choose to Save in HD 1080p, 720p, 540p or 360p as per your needs.
* 2X means twice faster than the normal speed while 1/2x means 2x slower the normal speed.