支持使用AVCaptureSession进行video的后台录制

我正在尝试在后台录制video，但是目前我的代码是在前台录制video时，应用程序将背景的方法。

-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error 

立即发生错误

  error:Error Domain=AVFoundationErrorDomain Code=-11818 "Recording Stopped" UserInfo=0x176aa180 {NSLocalizedRecoverySuggestion=Stop any other actions using the recording device and try again., NSUnderlyingError=0x1766c0e0 "The operation couldn't be completed. (OSStatus error -16133.)", NSLocalizedDescription=Recording Stopped} 

我在DemoApp-Info.plist中设置了以下值

 Required background modes->App plays audio or streams audio/video using AirPlay Application does not run in background->NO 

以下是我的代码

 - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. self.captureSession = [[AVCaptureSession alloc] init]; //CONFIGURE VIDEO RECORING AVCaptureDevice *videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; NSError *error = nil; self.videoInput = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:&error]; if(self.videoInput){ [self.captureSession addInput:self.videoInput]; } else{ NSLog(@"Input Error:%@", error); } //CONFIGURE AUDIO RECORDING AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio]; AVCaptureDeviceInput *captureDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:audioDevice error:&error]; if(captureDeviceInput){ [self.captureSession addInput:captureDeviceInput]; } //CONFIGURE DISPLAY OUTPUT AVCaptureVideoPreviewLayer *previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession]; [previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill]; previewLayer.frame = self.view.frame; [self.view.layer addSublayer:previewLayer]; //CONFIGURE FILE OUTPUT //HANDLE EVENT IN RECORD START/STOP ACTION AND ALSO IN AVCaptureMovieFileOutput DELEGATE self.captureMovieFileOutput = [[AVCaptureMovieFileOutput alloc] init]; if([self.captureSession canAddOutput:self.captureMovieFileOutput]){ [self.captureSession addOutput:self.captureMovieFileOutput]; } } - (IBAction)btnRecordClicked:(UIBarButtonItem *)sender { if([[sender title] isEqualToString:@"Record"]){ NSError *error = nil; [[UIApplication sharedApplication] beginReceivingRemoteControlEvents]; [[AVAudioSession sharedInstance] setDelegate:self]; [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryRecord error:&error]; NSLog(@"audioSessionError:%@", error); [[AVAudioSession sharedInstance] setActive:YES error: nil]; self.captureSession.usesApplicationAudioSession = YES; self.captureSession.automaticallyConfiguresApplicationAudioSession = YES; sender.title = @"Stop"; [self.captureSession startRunning]; //CREATE FILE NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"yyyyMMddHHmmss"]; NSString *outputFileName = [[kAppDocDirPath stringByAppendingPathComponent:[dateFormatter stringFromDate:[NSDate date]]] stringByAppendingPathExtension:@"mp4"]; NSURL *outputFileURL = [[NSURL alloc] initFileURLWithPath:outputFileName]; [self.captureMovieFileOutput startRecordingToOutputFileURL:outputFileURL recordingDelegate:self]; } else{ [[UIApplication sharedApplication] endReceivingRemoteControlEvents]; [[AVAudioSession sharedInstance] setDelegate:nil]; [[AVAudioSession sharedInstance] setActive:NO error: nil]; sender.title = @"Record"; [self.captureSession stopRunning]; [self.captureMovieFileOutput stopRecording]; } } -(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error { BOOL isSuccess = YES; NSLog(@"error:%@", error); if(error.code != noErr) { id value = [[error userInfo] objectForKey:AVErrorRecordingSuccessfullyFinishedKey]; if(value) { isSuccess = [value boolValue]; } } if(isSuccess) { ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init]; if([assetsLibrary videoAtPathIsCompatibleWithSavedPhotosAlbum:outputFileURL]) { [assetsLibrary writeVideoAtPathToSavedPhotosAlbum:outputFileURL completionBlock:^(NSURL *assetURL, NSError *error) { if(error){ NSLog(@"Error:%@", error); } //delete temporary file NSError *aError = nil; [[NSFileManager defaultManager] removeItemAtURL:outputFileURL error:&aError]; }]; } else{ NSLog(@"could not saved to photos album."); } } }