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POAVAudioRecorder won't record IF movie was previously recorded & played
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copied!<p>My iPhone app uses "AVAudioRecorder" to make voice recordings. It also uses "UIImagePickerController" to record movies and "MPMoviePlayerController" to play movies. </p> <p>Everything works fine until I do all three things in a row:</p> <ol> <li>Record a movie using UIImagePickerController</li> <li>Play back the recorded movie using MPMoviePlayerController</li> <li>Try to make a voice recording using AVAudioRecorder</li> </ol> <p>When I call AVAudioRecorder's "record" method in step 3, it returns NO indicating failure, but giving no hints as to why (come on Apple!) AVAudioRecorder's audioRecorderEncodeErrorDidOccur delegate method is never called and I receive no other errors when setting up the recorder.</p> <p>My first guess was that the movie recording/playing was modifying the shared instance of "AVAudioSession" in such a way that it prevented the audio recorder from working. However, I'm manually setting AVAudioSession's category property to "AVAudioSessionCategoryRecord" and I make the audio session active before trying to record.</p> <p>Here's my method for creating the recorder:</p> <pre><code>- (void)createAudioRecorder { NSError *error = nil; AVAudioSession *audioSession = [AVAudioSession sharedInstance]; [audioSession setCategory:AVAudioSessionCategoryRecord error:&error]; if (error) ... [audioSession setActive:YES error:&error]; if (error) ... NSMutableDictionary *settings = [[NSMutableDictionary alloc] init]; // General Audio Format Settings [settings setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey]; [settings setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey]; [settings setValue:[NSNumber numberWithInt:1] forKey:AVNumberOfChannelsKey]; // Encoder Settings [settings setValue:[NSNumber numberWithInt:AVAudioQualityMin] forKey:AVEncoderAudioQualityKey]; [settings setValue:[NSNumber numberWithInt:96] forKey:AVEncoderBitRateKey]; [settings setValue:[NSNumber numberWithInt:16] forKey:AVEncoderBitDepthHintKey]; // Write the audio to a temporary file NSURL *tempURL = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:@"Recording.m4a"]]; audioRecorder = [[AVAudioRecorder alloc] initWithURL:tempURL settings:settings error:&error]; if (error) ... audioRecorder.delegate = self; if ([audioRecorder prepareToRecord] == NO) NSLog(@"Recorder fails to prepare!"); [settings release]; } </code></pre> <p>And here's my method to start recording:</p> <pre><code>- (void)startRecording { if (!audioRecorder) [self createAudioRecorder]; NSError *error = nil; [[AVAudioSession sharedInstance] setActive:YES error:&error]; if (error) ... BOOL recording = [audioRecorder record]; if (!recording) NSLog(@"Recording won't start!"); } </code></pre> <p>Has anyone run into this problem before?</p>

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