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POAVCaptureOutput captureStillImageAsynchronouslyFromConnection never completes on iPhone5
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copied!<p>In my application I am displaying a <strong>AVCaptureVideoPreviewLayer</strong> and then capturing a still image when the user clicks a button using the <strong>captureStillImageAsynchronouslyFromConnection</strong> function in <strong>AVCaptureOutput</strong>. This has worked well for me up until the iPhone 5, on which it never completes. </p> <p>My setup code is:</p> <pre><code>... self.imageOutput = [[AVCaptureStillImageOutput alloc] init]; NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys: AVVideoCodecJPEG, AVVideoCodecKey, nil]; [self.imageOutput setOutputSettings:outputSettings]; self.captureSession = [[[AVCaptureSession alloc] init] autorelease]; [self.captureSession addInput:self.rearFacingDeviceInput]; [self.captureSession addOutput:self.imageOutput]; [self.captureSession setSessionPreset:AVCaptureSessionPresetPhoto]; self.previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.captureSession]; self.previewLayer.frame = CGRectMake(0, 0, 320, 427); self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspect; [self.captureSession startRunning]; [outputSettings release]; </code></pre> <p>My capture method is:</p> <pre><code>AVCaptureConnection *videoConnection = nil; for (AVCaptureConnection *connection in self.imageOutput.connections){ for (AVCaptureInputPort *port in [connection inputPorts]){ if ([[port mediaType] isEqual:AVMediaTypeVideo] ){ videoConnection = connection; break; } } if (videoConnection) { break; } } //code to abort if not return 'soon' ... [self.imageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error){ //use image here }]; </code></pre> <p>captureStillImageAsynchronouslyFromConnection never completes for me using an iPhone5 </p> <p>I have tested:</p> <ul> <li><p>It isn't OS 6 as this code works on both an iPhone 4s and an iPod (iPod touch (4th generation) that have been updated</p></li> <li><p>The captureSession is running</p></li> <li><p>videoConnection is not nil</p></li> <li><p>imageOutput is not nil</p></li> </ul> <p>Also:</p> <ul> <li><p>I'm using this method and not UIImagePickerController because I need to put the preview as a subview.</p></li> <li><p>calling <strong>stopRunning</strong> on the capture Session takes several seconds on the iPhone 5 as well</p></li> </ul>

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