AVCaptureSession视频方向iOS

Question

我使用AVCaptureSession捕捉视频。问题是我不明白视频方向背后的整个逻辑。我设置视频定位是这样的：

AVCaptureConnection *captureConnection = [self.movieFileOutput connectionWithMediaType:AVMediaTypeVideo]; 
[captureConnection setVideoOrientation:AVCaptureVideoOrientationPortrait]; 

所以我录制视频和显示预览给用户，但视频的方向始终是横盘整理。我需要它永远是肖像。 我发现了一些类似的问题，但没有找到解决方案。

我使用录制视频代码：

AVCaptureSession *session = [[AVCaptureSession alloc] init]; 
self.captureSession = session; 
AVCaptureDevice *VideoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; 

if (VideoDevice) 
{ 
    NSError *error; 
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:VideoDevice error:&error]; 
    self.videoInputDevice = input; 
    if (!error) 
    { 
     if ([self.captureSession canAddInput:self.videoInputDevice]) 
      [self.captureSession addInput:self.videoInputDevice]; 
    } 
} 

AVCaptureDevice *audioCaptureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio]; 
NSError *error = nil; 
AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioCaptureDevice error:&error]; 
if (audioInput) 
    [self.captureSession addInput:audioInput]; 

[self.previewLayer removeFromSuperlayer]; 
self.previewLayer = nil; 

[self setPreviewLayer:[[AVCaptureVideoPreviewLayer alloc] initWithSession:self.captureSession]]; 
[self.previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill]; 

AVCaptureMovieFileOutput *movieFileOutput = [[AVCaptureMovieFileOutput alloc] init]; 
self.movieFileOutput = movieFileOutput; 

Float64 TotalSeconds = kDefaultRecordingTime; 
int32_t preferredTimeScale = 30; 
CMTime maxDuration = CMTimeMakeWithSeconds(TotalSeconds, preferredTimeScale); 
self.movieFileOutput.maxRecordedDuration = maxDuration; 
self.movieFileOutput.movieFragmentInterval = kCMTimeInvalid; 
self.movieFileOutput.minFreeDiskSpaceLimit = 1024 * 1024; 

if ([self.captureSession canAddOutput:self.movieFileOutput]) 
    [self.captureSession addOutput:self.movieFileOutput]; 

[self.captureSession setSessionPreset:AVCaptureSessionPresetMedium]; 

if ([self.captureSession canSetSessionPreset:AVCaptureSessionPreset1280x720]) 
    [self.captureSession setSessionPreset:AVCaptureSessionPreset1280x720]; 

CGRect layerRect = [self.recordingView bounds]; 
[self.previewLayer setBounds:layerRect]; 
[self.previewLayer setPosition:CGPointMake(CGRectGetMidX(layerRect), 
              CGRectGetMidY(layerRect))]; 
[self.recordingView.layer addSublayer:self.previewLayer]; 

[self.recordingView bringSubviewToFront:self.recordButton]; 
[self.recordingView bringSubviewToFront:self.frontCameraButton]; 

AVCaptureConnection *captureConnection = [self.movieFileOutput connectionWithMediaType:AVMediaTypeVideo]; 
[captureConnection setVideoOrientation:AVCaptureVideoOrientationPortrait]; 


[self.captureSession commitConfiguration]; 
[self.captureSession startRunning]; 

我然后记录另一个视频，并使用AVMutableComposition混用。但是我所有的视频都是水平旋转的。将其与可变因素混合时，我不会做任何旋转。

我真的很感激，如果有人可以给我指示该做什么或者甚至可以看到代码中会出现什么问题，提前致谢！

Answer 1

简单地尝试这种解决定位问题：

AVCaptureConnection *captureConnection = [self.movieFileOutput connectionWithMediaType:AVMediaTypeVideo]; 
[captureConnection setVideoOrientation:AVCaptureVideoOrientationPortrait]; 

现在在同一个地方添加以下代码：

AVCaptureConnection *videoConnection = nil; 

for (AVCaptureConnection *connection in [movieFileOutput connections]) 
{ 
    NSLog(@"%@", connection); 
    for (AVCaptureInputPort *port in [connection inputPorts]) 
    { 
     NSLog(@"%@", port); 
     if ([[port mediaType] isEqual:AVMediaTypeVideo]) 
     { 
      videoConnection = connection; 
     } 
    } 
} 

if([videoConnection isVideoOrientationSupported]) // **Here it is, its always false** 
{ 
    [videoConnection setVideoOrientation:[[UIDevice currentDevice] orientation]]; 
} 

首先从代码中删除此2号线

编辑：

• 只需在最后添加我的代码即可。

我希望它能工作。