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copied!<p>here is my code, it works perfect for me , you can refer to it </p> <pre><code>- (void)initCapture { AVCaptureDevice *inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:nil]; if (!captureInput) { return; } AVCaptureVideoDataOutput *captureOutput = [[AVCaptureVideoDataOutput alloc] init]; /* captureOutput:didOutputSampleBuffer:fromConnection delegate method !*/ [captureOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()]; NSString* key = (NSString*)kCVPixelBufferPixelFormatTypeKey; NSNumber* value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA]; NSDictionary* videoSettings = [NSDictionary dictionaryWithObject:value forKey:key]; [captureOutput setVideoSettings:videoSettings]; self.captureSession = [[AVCaptureSession alloc] init]; NSString* preset = 0; if (!preset) { preset = AVCaptureSessionPresetMedium; } self.captureSession.sessionPreset = preset; if ([self.captureSession canAddInput:captureInput]) { [self.captureSession addInput:captureInput]; } if ([self.captureSession canAddOutput:captureOutput]) { [self.captureSession addOutput:captureOutput]; } //handle prevLayer if (!self.captureVideoPreviewLayer) { self.captureVideoPreviewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession]; } //if you want to adjust the previewlayer frame, here! self.captureVideoPreviewLayer.frame = self.view.bounds; self.captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; [self.view.layer addSublayer: self.captureVideoPreviewLayer]; [self.captureSession startRunning]; } </code></pre>

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