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Asked: 2026-05-23T07:35:48+00:00

I am working on an iPhone app for school and need some help. The

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I am working on an iPhone app for school and need some help. The app should record video, make it slow motion (about 2x), then save it to the photo library. So far I have everything except how to make the video slow motion. I know it can be done as there is already an app in the App Store that does it.

How can I take a video I’ve saved to a temp url and adjust the speed before saving it to the photo library?

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1 Answer

  1. Editorial Team

    If you need to export your video then you need to use the AVMutableComposition Class

    Then add your video as an AVAsset to an AVMutableComposition and scale it with:

    - (void)scaleTimeRange:(CMTimeRange)timeRange toDuration:(CMTime)duration

    Finally you export it using AVAssetExportSession Class

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