我不太明白如何处理前置摄像头视频捕捉方向。我在拍摄视频和图片时为后置摄像头处理了所有旋转，在拍照时为前置摄像头处理了所有旋转，并以正确的方向保存了捕获的视频和图片，前置摄像头视频捕捉除外。

第一个问题是在任一横向模式下，视频都无法以正确的方向正确保存。第二个问题是保存的视频是镜像的。虽然我知道如何使用前置摄像头处理图片的这种镜像效果，但我不确定要调用什么来处理视频。

我在试图找到专门针对这一问题的任何内容时遇到了很多麻烦，但没有找到。如果有人可以向我指出解决这个特定问题的线程，那就太好了。

无论哪种方式，这里都是当设备方向改变时处理视频方向的调用方法。如果使用前置摄像头，我不确定要在我的代码中添加什么。

/**************************************************************************
    DEVICE ORIENTATION DID CHANGE
    **************************************************************************/
    func deviceOrientationDidChange() {

        println("DEVICE ORIENTATION DID CHANGE CALLED")

        let orientation: UIDeviceOrientation = UIDevice.currentDevice().orientation

        //------ IGNORE THESE ORIENTATIONS ------
        if orientation == UIDeviceOrientation.FaceUp || orientation == UIDeviceOrientation.FaceDown || orientation == UIDeviceOrientation.Unknown || orientation == UIDeviceOrientation.PortraitUpsideDown || self.currentOrientation == orientation {

            println("device orientation does not need to change --- returning...")

            return
        }


        self.currentOrientation = orientation


        //------ APPLY A ROTATION USING THE STANDARD ROTATION TRANSFORMATION MATRIX in R3 ------

        /*

            x       y       z
            ---           ---
        x | cosø    sinø    0 |
        y | -sinø   consø   0 |
        z | 0       0       1 |
            ---           ---

        */


        //----- PERFORM BUTTON AND VIDEO DATA BUFFER ROTATIONS ------
        switch orientation {

        case UIDeviceOrientation.Portrait:

            rotateButtons(self.degrees0)

            if self.usingFrontCamera == true {


            }
            else {

            }

            println("Device Orientation Portrait")

            break

        case UIDeviceOrientation.LandscapeLeft:

            println("Device Orientation LandScapeLeft")

            rotateButtons(self.degrees90)

            if self.usingFrontCamera == true {

                println("Using front camera, rotation in landscape left")

//                if let connection = self.captureConnection {
//                    
//                    connection.videoOrientation = AVCaptureVideoOrientation.LandscapeRight
//                    
//                    println("Capture connection Orientation is LandScape Right")
//                }
//                else {
//                    
//                    println("Capture connection is nil, could not change video orientation")
//                }
            }
            else {

                if let connection = self.captureConnection {

                    connection.videoOrientation = AVCaptureVideoOrientation.LandscapeRight

                    println("Capture connection Orientation is LandScape Right")
                }
                else {

                    println("Capture connection is nil, could not change video orientation")
                }
            }

            break

        case UIDeviceOrientation.LandscapeRight:

            println("Device Orientation LandscapeRight")

            rotateButtons(-self.degrees90)

            if self.usingFrontCamera == true {

                println("Using front camera, rotation in landscape right")

//                if let connection = self.captureConnection {
//                    
//                    connection.videoOrientation = AVCaptureVideoOrientation.LandscapeRight
//                    
//                    println("Capture connection Orientation is LandScape Left")
//                }
//                else {
//                    
//                    println("Capture connection is nil, could not change video orientation")
//                }
            }
            else {

                if let connection = self.captureConnection {

                    connection.videoOrientation = AVCaptureVideoOrientation.LandscapeLeft

                    println("Capture connection Orientation is LandScape Left")
                }
                else {

                    println("Capture connection is nil, could not change video orientation")
                }
            }

            break

        default:

            break
        }
    }

最佳答案

基于这个答案:Video Saving in the wrong orientation AVCaptureSession

我遇到了同样的问题，并且能够在这篇文章之后解决它。

var videoConnection:AVCaptureConnection?
  for connection in self.fileOutput.connections {
    for port in connection.inputPorts! {
      if port.mediaType == AVMediaTypeVideo {
        videoConnection = connection as? AVCaptureConnection
          if videoConnection!.supportsVideoMirroring {
            videoConnection!.videoMirrored = true
          }
        }
      }
   }
}

如果对你有帮助请告诉我

关于ios - 使用前置摄像头时需要镜像视频方向和处理旋转，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30406417/