iOS 8中的AVAudioRecorder无法处理kAudioFormatMPEG4AAC [英] AVAudioRecorder in iOS 8 does not handle kAudioFormatMPEG4AAC

问题描述

我的代码工作正常，直到iOS 8 kAudioFormatMPEG4AAC ，但现在它创建了一个空文件。没有报告错误。当我将其更改为 kAudioFormatLinearPCM 时，它可以正常工作。这是我的代码：

My code worked fine until iOS 8 kAudioFormatMPEG4AAC but now it creates an empty file. No errors are reported. When I changed it to kAudioFormatLinearPCM it works. This is my code:

recordSettings = [NSDictionary dictionaryWithObjectsAndKeys:
    [NSNumber numberWithInt:AVAudioQualityMin], AVEncoderAudioQualityKey,
    [NSNumber numberWithInt: kAudioFormatLinearPCM], AVFormatIDKey,
    [NSNumber numberWithInt:16], AVEncoderBitRateKey,
    [NSNumber numberWithInt: 1], AVNumberOfChannelsKey,
    [NSNumber numberWithFloat:32000.0], AVSampleRateKey,
    nil];

推荐答案

即使对于<$ c，该比特率看起来也很低$ c> kAudioFormatMPEG4AAC （每秒16字节），可以尝试16000或64000或更多。

That bitrate looks suspiciously low, even for kAudioFormatMPEG4AAC (16 bytes per second), maybe try 16000 or 64000 or more.

p.s。为你的 NSDictionarys ， NSArrays 和 NSNumbers ，我认为它们有所改进：

p.s. try the new Objective-C literals for your NSDictionarys, NSArrays and NSNumbers, I think they're an improvement:

recordSettings = @{
    AVEncoderAudioQualityKey : AVAudioQualityMin,
    AVFormatIDKey : @(kAudioFormatLinearPCM),
    AVEncoderBitRateKey : @16000,
    AVNumberOfChannelsKey : @1,
    AVSampleRateKey : @32000
}; 

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