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POPlaying video with AVPlayer and recording sound with AVAudioRecorder simultaneously
 

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    <p>I was googling this problem for many days but I didn't find a solution for my simple problem.</p> <p>I'm trying to play a video while recording sound. Recording sound works fine without the video. And the video works fine without the recording.</p> <p>As soon as I put both together, the recording throws values which do not react on sound and the video is not playing anymore. By the way this happens only on my device (iPhone 4 / iOS5). In the simulator everything works fine.</p> <p>This is a reduced version of my code which is in a ViewController.</p> <pre><code>// Audio Recorder NSURL *nullUrl = [NSURL fileURLWithPath:@"/dev/null"]; NSDictionary *settings = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithFloat:44100.0], AVSampleRateKey, [NSNumber numberWithInt:kAudioFormatAppleLossless], AVFormatIDKey, [NSNumber numberWithInt:1], AVNumberOfChannelsKey, [NSNumber numberWithInt:AVAudioQualityMax], AVEncoderAudioQualityKey, nil]; NSError *recorderError; _recorder = [[AVAudioRecorder alloc] initWithURL:nullUrl settings:settings error:&amp;recorderError]; if (_recorder) { [_recorder prepareToRecord]; _recorder.meteringEnabled = YES; [_recorder record]; _levelTimer = [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(levelTimerCallback:) userInfo:nil repeats:YES]; } // Video Player NSURL *url = [[NSBundle mainBundle] URLForResource:@"Video" withExtension:@"mp4" subdirectory:nil]; _avPlayer = [[AVPlayer playerWithURL:url] retain]; _avPlayerLayer = [[AVPlayerLayer playerLayerWithPlayer:_avPlayer] retain]; _avPlayerLayer.frame = self.view.layer.bounds; [self.view.layer addSublayer:_avPlayerLayer]; [_avPlayer play]; </code></pre> <p>The recorder simply outputs a value which is read in the levelTimerCallback method. The video simply plays a short video.</p> <p>I figured out that I have to set a category for the AVAudioSession. If I implement this code after app start, the video is playing but the recorder still outputs the same values without reacting to sound.</p> <pre><code>NSError *error = nil; AVAudioSession *audioSession = [AVAudioSession sharedInstance]; [audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&amp;error]; [audioSession setActive:YES error:&amp;error]; </code></pre> <p>I could imagine that I might have to do something with AudioSessionSetProperty</p> <pre><code>UInt32 sessionCategory = kAudioSessionCategory_PlayAndRecord; AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(sessionCategory), &amp;sessionCategory); UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker; AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof (audioRouteOverride),&amp;audioRouteOverride); </code></pre> <p>But that doesn't change anything. Do you have an idea what I am missing or how to set up the AudioSession properly?</p> <p>Thank you for every hint on that!</p> <p>Cheers, Raphael ;)</p>
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