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我是iOS编程的新手,现在我想设置iOS前置摄像头的帧,如18 fps或25 fps。这里是我的代码,我很困惑,不管我如何改变activeVideoMinFrameDuration和activeVideoMaxFrameDuration的值,最终的视频总是30fps。如何设置iOS相机的帧速率
do {
try videoDevice!.lockForConfiguration()
videoDevice!.activeVideoMinFrameDuration = CMTimeMake(1, 20)
videoDevice!.activeVideoMaxFrameDuration = CMTimeMake(1, 20)
videoDevice!.unlockForConfiguration()
} catch let error as NSError {
NSLog("Could not lock device for configuration: %@", error)
}