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我是iOS編程的新手,現在我想設置iOS前置攝像頭的幀,如18 fps或25 fps。這裏是我的代碼,我很困惑,不管我如何改變activeVideoMinFrameDuration和activeVideoMaxFrameDuration的值,最終的視頻總是30fps。如何設置iOS相機的幀速率
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)
}