iPhones don’t have built-in tools to speed up regular videos, so you’ll need to download video editing software on the App Store. One option we recommend is Apple’s free iMovie app. the process is similar.
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Download and launch iMovie on your iPhone.
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Tap “Create Project” from the “Project” menu of the app.
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Select Movie from the New Project tab.
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Select the video you want to edit from the gallery and tap “Create Movie” at the bottom of the screen.
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The imported video is added to your timeline. Tap a clip and select the speedometer icon from the Tools menu.
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A slider appears above the speedometer icon. There is a turtle on one end and a rabbit on the other. To speed up the video, drag the slider to the right, towards the rabbit.
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in the upper right corner of the screen[完了]Tap the button to save your project.
Please note that speeding up the video may result in distorted or higher pitched audio. In such cases, consider muting the audio or using a different audio track.
