iOS 9以60fps記錄視頻

試圖使用AVFoundation和Swift以60fps記錄視頻，但下面的代碼無法正常工作。即使60fps設置，視頻仍然以30fps記錄。iOS 9以60fps記錄視頻

captureSession = AVCaptureSession() 

var finalFormat = AVCaptureDeviceFormat() 
var maxFps: Double = 0 
for vFormat in camera!.formats 
{ 
    var ranges  = vFormat.videoSupportedFrameRateRanges as! [AVFrameRateRange] 
    let frameRates = ranges[0] 
    if frameRates.maxFrameRate >= maxFps && frameRates.maxFrameRate <= 60 
    { 
     maxFps = frameRates.maxFrameRate 
     finalFormat = vFormat as! AVCaptureDeviceFormat 
    } 
} 

print(String(maxFps) + " fps"); //prints 60 fps 
try camera!.lockForConfiguration() 
camera!.activeFormat = finalFormat 
camera!.activeVideoMinFrameDuration = CMTimeMake(1, 60) 
camera!.activeVideoMaxFrameDuration = CMTimeMake(1, 60) 
camera!.unlockForConfiguration() 

let video = try AVCaptureDeviceInput(device: camera) as AVCaptureDeviceInput 
captureSession!.addInput(video) 

let audio = try AVCaptureDeviceInput(device: AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeAudio)) as AVCaptureDeviceInput 
captureSession!.addInput(audio) 

fileOutput = AVCaptureMovieFileOutput() 

captureSession?.addOutput(fileOutput) 

captureSession!.startRunning()

來源

2016-02-04 user2800679

你知道，只有iphone 6或更新的，有這個功能，對不對？ – UlyssesR

是的。我正在測試iphone 6s – user2800679

該設備，使用本機相機，記錄在60fps？ – UlyssesR

在創建AVCaptureDeviceInput後設置攝像頭屬性。

let video = try AVCaptureDeviceInput(device: camera) as AVCaptureDeviceInput 
captureSession!.addInput(video) 

print(String(maxFps) + " fps"); //prints 60 fps 
try camera!.lockForConfiguration() 
camera!.activeFormat = finalFormat 
camera!.activeVideoMinFrameDuration = CMTimeMake(1, 60) 
camera!.activeVideoMaxFrameDuration = CMTimeMake(1, 60) 
camera!.unlockForConfiguration()

來源

2016-02-06 18:19:16 user2800679

iOS 9以60fps記錄視頻

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