iphone - Using AVCaptureSession and AVAudioPlayer together -

i able record video , output movie file correctly. however, have problem video recording (no video ouput) when trying use avaudioplayer play audio. mean cannot use avcapturesession , avaudioplayer @ same time? here code create capture session , play audio. video capture started first, during capturing, want play audio. help.

code create capture session record video (with audio) - output .mov file:

- (void)addvideoinput     avcapturedevice *audiodevice = [avcapturedevice defaultdevicewithmediatype:avmediatypeaudio];     //... code setting videodevice/frontcamera     nserror *error;     avcapturedeviceinput *videoin = [avcapturedeviceinput      deviceinputwithdevice:frontcamera error:&error];     avcapturedeviceinput *audioin = [avcapturedeviceinput      deviceinputwithdevice:audiodevice error:&error];     if (!error) {          if ([capturesession canaddinput:audioin])               [capturesession addinput:audioin];          else               nslog(@"couldn't add audio input.");            if ([capturesession canaddinput:videoin])               [capturesession addinput:videoin];          else               nslog(@"couldn't add video input."); } - (void)addvideooutput {      avcapturemoviefileoutput *m_capturefileoutput = [[avcapturemoviefileoutput alloc] init];      [capturesession addoutput:m_capturefileoutput];       [capturesession startrunning];       nsstring *docdir = [nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes) objectatindex:0];      nsmutablestring *filepath = [nsmutablestring stringwithstring:@"movie.mov"];      nsstring* fileroot = [docdir stringbyappendingpathcomponent:filepath];      nsurl *fileurl = [nsurl fileurlwithpath:fileroot];       avcaptureconnection *videoconnection = null;       ( avcaptureconnection *connection in [m_capturefileoutput connections] )       {          ( avcaptureinputport *port in [connection inputports] )           {              if ( [[port mediatype] isequal:avmediatypevideo] )               {                  videoconnection = connection;               }          }      }       [videoconnection setvideoorientation:avcapturevideoorientationlandscaperight];         [m_capturefileoutput startrecordingtooutputfileurl:fileurl recordingdelegate:self];      [m_capturefileoutput release]; } 

code play audio, function call during video capture session. if don't call function, video recorded , able save .mov file. however, if call function, there's no output .mov file.

- (void)playaudio {      nsstring *soundfilepath = [[nsbundle mainbundle] pathforresource:@"audiofile" oftype:@"mp3"];      nsurl *fileurl = [[nsurl alloc] initfileurlwithpath:soundfilepath];      avaudioplayer *newplayer = [[avaudioplayer alloc] initwithcontentsofurl:fileurl error:nil];      [fileurl release];      self.audioplayer = newplayer;      [newplayer release];      [audioplayer setdelegate:self];      [audioplayer preparetoplay];      [audioplayer play]; } 

i fixed problem setting audio session. called following function before creating audio player object play audio. way, able record video (with audio) , play audio @ same time.

- (void)setupaudiosession {          static bool audiosessionsetup = no;         if (audiosessionsetup) {                 return;            }         [[avaudiosession sharedinstance] setcategory: avaudiosessioncategoryplayback error: nil];         uint32 dosetproperty = 1;          audiosessionsetproperty (kaudiosessionproperty_overridecategorymixwithothers, sizeof(dosetproperty), &dosetproperty);          [[avaudiosession sharedinstance] setactive: yes error: nil];           audiosessionsetup = yes;  }   - (void)playaudio {          [self setupaudiosession];          nsstring *soundfilepath = [[nsbundle mainbundle] pathforresource:@"audiofile" oftype:@"mp3"];          nsurl *fileurl = [[nsurl alloc] initfileurlwithpath:soundfilepath];          avaudioplayer *newplayer = [[avaudioplayer alloc] initwithcontentsofurl:fileurl error:nil];          [fileurl release];          self.audioplayer = newplayer;          [newplayer release];          [audioplayer setdelegate:self];          [audioplayer preparetoplay];          [audioplayer play];     }