iPad 1無法錄製MPEG4AAC錄音？

我一直試圖在iPad應用程序上錄製kAudioFormatMPEG4AAC格式，錄製在iPad2上工作正常& iPad3，但不在iPad1上。這裏iPad1 & iPad3擁有iOS 5.1，而iPad2擁有iOS 5.0.1。iPad 1無法錄製MPEG4AAC錄音？

記錄的代碼是一樣..

if(recordEncoding == ENC_PCM) 
{ 
    [recordSettings setObject:[NSNumber numberWithInt: kAudioFormatLinearPCM] forKey: AVFormatIDKey]; 
    [recordSettings setObject:[NSNumber numberWithFloat:44100.0] forKey: AVSampleRateKey]; 
    [recordSettings setObject:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey]; 
    [recordSettings setObject:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey]; 
    [recordSettings setObject:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey]; 
    [recordSettings setObject:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey]; 
} 
else 
{ 
    NSNumber *formatObject; 

    switch (recordEncoding) { 
     case (ENC_AAC): 
      formatObject = [NSNumber numberWithInt: kAudioFormatMPEG4AAC]; 
      break; 
     case (ENC_ALAC): 
      formatObject = [NSNumber numberWithInt: kAudioFormatAppleLossless]; 
      break; 
     case (ENC_IMA4): 
      formatObject = [NSNumber numberWithInt: kAudioFormatAppleIMA4]; 
      break; 
     case (ENC_ILBC): 
      formatObject = [NSNumber numberWithInt: kAudioFormatiLBC]; 
      break; 
     case (ENC_ULAW): 
      formatObject = [NSNumber numberWithInt: kAudioFormatULaw]; 
      break; 
     default: 
      formatObject = [NSNumber numberWithInt: kAudioFormatAppleIMA4]; 
    } 

    [recordSettings setObject:formatObject forKey: AVFormatIDKey]; 
    [recordSettings setObject:[NSNumber numberWithFloat:44100.0] forKey: AVSampleRateKey]; 
    [recordSettings setObject:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey]; 
    [recordSettings setObject:[NSNumber numberWithInt:12800] forKey:AVEncoderBitRateKey]; 
    [recordSettings setObject:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey]; 
    [recordSettings setObject:[NSNumber numberWithInt: AVAudioQualityHigh] forKey: AVEncoderAudioQualityKey]; 
}

誰能幫我解決這個問題。其中一個是肯定的，MPEG4AAC在iPAD 1上工作爲this post建議

來源

2012-05-10 Haris Hussain

會發生什麼？錯誤訊息？崩潰？ –

沒有，AudioFile被創建，雖然它的oo：o secs在光盤上，並且大小通常爲29 KB。這僅適用於iPad 1.在iPad2和3上，所有東西都能正常工作。 –

嘗試發表評論AVEncoderBitRateKey行。 AAC也不需要AVLinearPCMBitDepthKey。

來源

2012-05-10 12:31:21 Shmidt

不工作仍然，我嘗試了所有可能的迭代..評論AVEncoderBitRateKey，AVLinearPCMBitDepthKey每一次，然後兩者。沒有工作。 –

iPad 1無法錄製MPEG4AAC錄音？

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