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[英]macOS swift AVCaptureSession sessionPreset doesn't work
[英]How to AVCaptureSession.sessionPreset to 720x1280px(or 1/1.77 scale of anything)
我正在使用swift3,当我使用AVCaptureSessionPresetMedium等时,无法将分辨率更改为自定义值。它不适合屏幕比例(1 / 1.77)。
let output = AVCaptureVideoDataOutput()
output.setSampleBufferDelegate(self, queue: sampleQueue)
let metaOutput = AVCaptureMetadataOutput()
metaOutput.setMetadataObjectsDelegate(self, queue: faceQueue)
session.beginConfiguration()
//所需分辨率:720x1280px // session.sessionPreset = AVCaptureSessionPresetMedium;
if session.canAddInput(input) {
session.addInput(input)
}
if session.canAddOutput(output) {
output .alwaysDiscardsLateVideoFrames = true;
session.addOutput(output)
connection1 = output.connection(withMediaType: AVMediaTypeVideo)
connection1?.preferredVideoStabilizationMode = AVCaptureVideoStabilizationMode.auto;
connection1?.videoOrientation = .portrait
connection1?.isVideoMirrored = true;
}
if session.canAddOutput(metaOutput) {
output .alwaysDiscardsLateVideoFrames = true;
session.addOutput(metaOutput)
connection2 = metaOutput.connection(withMediaType: AVMediaTypeMetadata)
connection2?.preferredVideoStabilizationMode = AVCaptureVideoStabilizationMode.auto;
connection2?.videoOrientation = .portrait
connection2?.isVideoMirrored = true
}
您应该使用AVCaptureSessionPreset1280x720
预设。 预设以横向表示,但1280x720的捕获设置与720x1280相同,唯一的不同是方向。 例如,对于支持旋转的应用程序:
func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, from connection: AVCaptureConnection!)
{
guard let pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else { return }
cameraImage = CIImage(cvPixelBuffer: pixelBuffer)
print(cameraImage?.extent ?? "")
}
横向时将打印(0.0, 0.0, 1280.0, 720.0)
(0.0, 0.0, 720.0, 1280.0)
,纵向时将打印(0.0, 0.0, 1280.0, 720.0)
(0.0, 0.0, 720.0, 1280.0)
。
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