[英]iOS 9 record video at 60fps
嘗試使用AVFoundation和Swift錄制60fps的視頻,但是下面的代碼不起作用。 即使設置為60fps,視頻仍以30fps錄制。
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()
創建AVCaptureDeviceInput后設置攝像機屬性即可。
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()
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