iOS: error in __connection_block_invoke_2: Connection interrupted [duplicate] - ios

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What is "error in __connection_block_invoke_2: Connection interrupted" in iOS?
(1 answer)
Closed 7 years ago.
Xcode/iOS 8/AVFoundation related error in console:
error in __connection_block_invoke_2: Connection interrupted
I am just adding AVCaptureVideoDataOutput to Apple's sample app 'AVCamManualUsingtheManualCaptureAPI'
What I added was:
// CoreImage wants BGRA pixel format
NSDictionary *outputSettings = #{ (id)kCVPixelBufferPixelFormatTypeKey : [NSNumber numberWithInteger:kCVPixelFormatType_32BGRA]};
// create and configure video data output
AVCaptureVideoDataOutput *videoDataOutput = [[AVCaptureVideoDataOutput alloc] init];
videoDataOutput.videoSettings = outputSettings;
videoDataOutput.alwaysDiscardsLateVideoFrames = YES;
[videoDataOutput setSampleBufferDelegate:self queue:sessionQueue];
Above snippet inserted in to sample project:
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
self.recordButton.layer.cornerRadius = self.stillButton.layer.cornerRadius = self.cameraButton.layer.cornerRadius = 4;
self.recordButton.clipsToBounds = self.stillButton.clipsToBounds = self.cameraButton.clipsToBounds = YES;
// Create the AVCaptureSession
AVCaptureSession *session = [[AVCaptureSession alloc] init];
[self setSession:session];
// Set up preview
[[self previewView] setSession:session];
// Check for device authorization
[self checkDeviceAuthorizationStatus];
// In general it is not safe to mutate an AVCaptureSession or any of its inputs, outputs, or connections from multiple threads at the same time.
// Why not do all of this on the main queue?
// -[AVCaptureSession startRunning] is a blocking call which can take a long time. We dispatch session setup to the sessionQueue so that the main queue isn't blocked (which keeps the UI responsive).
dispatch_queue_t sessionQueue = dispatch_queue_create("session queue", DISPATCH_QUEUE_SERIAL);
[self setSessionQueue:sessionQueue];
dispatch_async(sessionQueue, ^{
[self setBackgroundRecordingID:UIBackgroundTaskInvalid];
NSError *error = nil;
AVCaptureDevice *videoDevice = [AAPLCameraViewController deviceWithMediaType:AVMediaTypeVideo preferringPosition:AVCaptureDevicePositionBack];
AVCaptureDeviceInput *videoDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:&error];
if (error)
{
NSLog(#"%#", error);
}
[[self session] beginConfiguration];
if ([session canAddInput:videoDeviceInput])
{
[session addInput:videoDeviceInput];
[self setVideoDeviceInput:videoDeviceInput];
[self setVideoDevice:videoDeviceInput.device];
dispatch_async(dispatch_get_main_queue(), ^{
// Why are we dispatching this to the main queue?
// Because AVCaptureVideoPreviewLayer is the backing layer for our preview view and UIView can only be manipulated on main thread.
// Note: As an exception to the above rule, it is not necessary to serialize video orientation changes on the AVCaptureVideoPreviewLayer’s connection with other session manipulation.
[[(AVCaptureVideoPreviewLayer *)[[self previewView] layer] connection] setVideoOrientation:(AVCaptureVideoOrientation)[self interfaceOrientation]];
});
}
AVCaptureDevice *audioDevice = [[AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio] firstObject];
AVCaptureDeviceInput *audioDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:audioDevice error:&error];
if (error)
{
NSLog(#"%#", error);
}
if ([session canAddInput:audioDeviceInput])
{
[session addInput:audioDeviceInput];
}
AVCaptureMovieFileOutput *movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];
if ([session canAddOutput:movieFileOutput])
{
[session addOutput:movieFileOutput];
AVCaptureConnection *connection = [movieFileOutput connectionWithMediaType:AVMediaTypeVideo];
if ([connection isVideoStabilizationSupported])
{
[connection setEnablesVideoStabilizationWhenAvailable:YES];
}
[self setMovieFileOutput:movieFileOutput];
}
AVCaptureStillImageOutput *stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
if ([session canAddOutput:stillImageOutput])
{
[stillImageOutput setOutputSettings:#{AVVideoCodecKey : AVVideoCodecJPEG}];
[session addOutput:stillImageOutput];
[self setStillImageOutput:stillImageOutput];
}
// CoreImage wants BGRA pixel format
NSDictionary *outputSettings = #{ (id)kCVPixelBufferPixelFormatTypeKey : [NSNumber numberWithInteger:kCVPixelFormatType_32BGRA]};
// create and configure video data output
AVCaptureVideoDataOutput *videoDataOutput = [[AVCaptureVideoDataOutput alloc] init];
videoDataOutput.videoSettings = outputSettings;
videoDataOutput.alwaysDiscardsLateVideoFrames = YES;
[videoDataOutput setSampleBufferDelegate:self queue:sessionQueue];
[[self session] commitConfiguration];
dispatch_async(dispatch_get_main_queue(), ^{
[self configureManualHUD];
});
});
self.manualHUDFocusView.hidden = YES;
self.manualHUDExposureView.hidden = YES;
self.manualHUDWhiteBalanceView.hidden = YES;
}
I get 'error in __connection_block_invoke_2: Connection interrupted' and also...
-(void) captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
..delegate never gets called.
All I am trying to do is modify their code to do live Core Image Filters.

Answer 1

So I fixed the issue.
You can't use AVCaptureMovieFileOutput and AVCaptureVideoDataOutput simultaneously. I took out AVCaptureMovieFileOutput, and the AVCaptureVideoDataOutput delegate is called.