Play audio ruins my AVCaptureSession ios - ios

Question

I am using AVCaptureSession to record audio and video and pass this data to
- (void) captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection {
if(!_isPaused) {
pass sample buffer to encoder
}
}
Everything works nice (delegate is called and I am processing frames) until I open control panel and play music (I pause processing video from appDelegate). After stop music and try to continue recording the delegate method is never called. I think that playing audio something "ruins" my AVCaptureSession or delegate and I need to fix this issue...
here is method where I init AVCaptureSession
- (void) startup
{
if (_session == nil)
{
NSLog(#"Starting camera");
// create capture device with video input
_session = [[AVCaptureSession alloc] init];
AVCaptureDevice* backCamera = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
AVCaptureDeviceInput* input = [AVCaptureDeviceInput deviceInputWithDevice:backCamera error:nil];
[_session addInput:input];
// audio input from default mic
AVCaptureDevice* mic = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
AVCaptureDeviceInput* micinput = [AVCaptureDeviceInput deviceInputWithDevice:mic error:nil];
[_session addInput:micinput];
_captureQueue = dispatch_queue_create("myQueue", DISPATCH_QUEUE_SERIAL);
AVCaptureVideoDataOutput* videoout = [[AVCaptureVideoDataOutput alloc] init];
[videoout setSampleBufferDelegate:self queue:_captureQueue];
NSDictionary* setcapSettings = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange], kCVPixelBufferPixelFormatTypeKey,
nil];
videoout.videoSettings = setcapSettings;
[_session addOutput:videoout];
_videoConnection = [videoout connectionWithMediaType:AVMediaTypeVideo];
NSDictionary* actual = videoout.videoSettings;
AVCaptureAudioDataOutput* audioout = [[AVCaptureAudioDataOutput alloc] init];
[audioout setSampleBufferDelegate:self queue:_captureQueue];
[_session addOutput:audioout];
_audioConnection = [audioout connectionWithMediaType:AVMediaTypeAudio];
[_session startRunning];
}
}
and here is my interface:
#interface CameraController () <AVCaptureVideoDataOutputSampleBufferDelegate, AVCaptureAudioDataOutputSampleBufferDelegate>
{
AVCaptureSession* _session;
AVCaptureVideoPreviewLayer* _preview;
dispatch_queue_t _captureQueue;
AVCaptureConnection* _audioConnection;
AVCaptureConnection* _videoConnection; }
and in appDelegate I pause and resume rocording like:
-(void)applicationDidBecomeActive:(UIApplication *)application {
[[CamerraController controller] resume capture]; //this only set _isPaused = NO;
}
-(void)applicationWillResignActive:(UIApplication *)application {
[[CamerraController controller] pauseCapture]; //this only set _isPaused = YES;
}
I am in dead end, thank you for any help