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Alex Saidani
Alex Saidani

Reputation: 1307

Process Slow Motion Video Effect iOS

How would I go about creating a slow motion effect on a portion of a video recorded or obtained from the camera roll in iOS? I am using the AVFoundation framework to select a video from the camera roll or record a video. I intend to add the effect from Time1 to Time2 and then let the video continue at a normal speed.

Upvotes: 0

Views: 1340

Answers (1)

Steve McFarlin
Steve McFarlin

Reputation: 3596

Generally speaking you create a slow motion effect by recording at a higher frame rate. So if you record at 60FPS but playback at 30FPS, then you have created a half time slow motion effect. This is how it is done with film. With prerecorded fixed frame rate footage you could playback at a fraction of the original frame rate. If this is to be saved back to a container file, then you will need to adjust the presentation time stamps accordingly.

Upvotes: 1

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