什么是使用AVAudioSession的AAC语音重新编码的最佳设置？

问题描述

我想在iPhone上录制语音，并产生一个针对小尺寸和录音质量优化的文件。有了下面的设置AAC我得到一个小的文件大小，但我不知道我得到最佳质量。

I'm looking to record voice on the iPhone and produce a file that is optimized for small size and recording quality for voice. With the settings below for AAC I'm getting a small file size, but I'm not sure I'm getting optimal quality. Other than trial and errror, is there anything I can turn to, or any recommendations?

[recordSetting setValue:[NSNumber numberWithFloat:8000.0] forKey:AVSampleRateKey];
[recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey]; 
[recordSetting setValue:[NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey];
[recordSetting setObject:[NSNumber numberWithInt:AVAudioQualityLow] forKey: AVEncoderAudioQualityKey]; 
[recordSetting setValue:[NSNumber numberWithInt: 8000] forKey:AVEncoderBitRateKey];

推荐答案

有几种语音优化的编解码器，包括。使用iLBC以8kHz采样率，您将得到一个大约7MB每小时的记录的文件。

There are several codecs which are optimized for voice, including iLBC. Using iLBC at the 8kHz sample rate that you have will result in a file that is approximately 7MB per hour of recording.

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