[Objective-c] AVCaptureConnection no se activa

[MCF]

Hola estoy intentando grabar video con AVCaptureSession y AVCaptureMovieFileOutput, pero al agregar la entrada de audio y video no se activan las conexiones.

Éste es el código

Código:

session = [[AVCaptureSession alloc] init];
    
    [session beginConfiguration];
    session.sessionPreset = AVCaptureSessionPresetPhoto;
    
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
    
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
    AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioDevice error:nil];
    
    NSError *error;
    
    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
    [audioSession setCategory:AVAudioSessionCategoryRecord error:&error];
    
    [audioSession setActive:YES error:&error];
    
    [session addInput:input];
    [session addInput:audioInput];
    
    
    MovieFileOutput = [[AVCaptureMovieFileOutput alloc] init];
    
    [session addOutput:MovieFileOutput];

Después simplemente hago esto para iniciar la grabación

Código:

NSString *outputPath = [[NSString alloc] initWithFormat:@"%@%@", NSTemporaryDirectory(), @"output2.mov"];
            
            NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:outputPath];
            NSFileManager *fileManager = [NSFileManager defaultManager];
            if ([fileManager fileExistsAtPath:outputPath])
            {
                
                NSError *error;
                if ([fileManager removeItemAtPath:outputPath error:&error] == NO)
                {
                    
                    NSLog(@"error %@",error);
                    //Error - handle if requried
                }
            }
            //Start recording
            @try{
                NSLog(@"grabando...");
                [MovieFileOutput startRecordingToOutputFileURL:outputURL recordingDelegate:self];

            
                alreadyGrabando = YES;
            }@catch(NSException *e){}

Pero siempre me da lanza la excepción:

Código:

exception *** -[AVCaptureMovieFileOutput startRecordingToOutputFileURL:recordingDelegate:] - no active/enabled connections.

Y al checar las entradas de audio y video:

Código:

"<AVCaptureConnection: 0x124799c50 [type:vide][enabled:1][active:0]>",
    "<AVCaptureConnection: 0x124794110 [type:soun][enabled:1][active:0]>"

¿Alguien sabe cómo activar las entradas?