AVCaptureMovieFileOutput - no active/enabled connections

Question

I am trying to record video in my iPhone app using AVFoundation. But whenever I click the Record button app crashes with this message

-[AVCaptureMovieFile

Answer 1

Several things are missing in your code :

1. You forgot to add movieOutput to your captureSession
2. Same for your audioInput
3. All your session configuration needs to be encapsulated by [_captureSession beginConfiguration] and [_captureSession commitConfiguration]
4. For audio recording you need to set the AVAudioSession to the correct category.

Here is your code updated :

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSError *error = nil;
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryRecord
                                           error:&error];

    if(!error)
    {
        [[AVAudioSession sharedInstance] setActive:YES error:&error];

        if(error) NSLog(@"Error while activating AudioSession : %@", error);
    }
    else
    {
        NSLog(@"Error while setting category of AudioSession : %@", error);
    }

    self.captureSession = [[AVCaptureSession alloc] init];

    AVCaptureDevice *videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];

    self.videoInput = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:nil];
    self.audioInput = [[AVCaptureDeviceInput alloc] initWithDevice:audioDevice error:nil];

    self.stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
    NSDictionary *stillImageOutputSettings = [[NSDictionary alloc] initWithObjectsAndKeys:
                                              AVVideoCodecJPEG, AVVideoCodecKey, nil];
    [self.stillImageOutput setOutputSettings:stillImageOutputSettings];

    self.movieOutput = [[AVCaptureMovieFileOutput alloc] init];

    [self.captureSession beginConfiguration];

    [self.captureSession addInput:self.videoInput];
    [self.captureSession addInput:self.audioInput];
    [self.captureSession addOutput:self.movieOutput];
    [self.captureSession addOutput:self.stillImageOutput];

    [self.captureSession commitConfiguration];

    AVCaptureVideoPreviewLayer *previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession];
    previewLayer.frame = CGRectMake(0, 0, 320, 500);
    [self.view.layer addSublayer:previewLayer];

    [self.captureSession startRunning];
}

- (IBAction)toggleRecording:(id)sender
{
    if(!self.movieOutput.isRecording)
    {
        [self.recordButton setTitle:@"Stop" forState:UIControlStateNormal];

        NSString *outputPath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"output.mp4"];

        NSFileManager *manager = [[NSFileManager alloc] init];
        if ([manager fileExistsAtPath:outputPath])
        {
            [manager removeItemAtPath:outputPath error:nil];
        }

        [self.movieOutput startRecordingToOutputFileURL:[NSURL fileURLWithPath:outputPath]
                                      recordingDelegate:self];
    }
    else
    {
        [self.recordButton setTitle:@"Start recording" forState:UIControlStateNormal];

        [self.movieOutput stopRecording];
    }
}

- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error
{
    NSLog(@"Did finish recording, error %@ | path %@ | connections %@", error, [outputFileURL absoluteString], connections);
}

Hope this helps