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IOS 的音频的编码比特率为什么设置无效呢?我想要128Know,但得到的一直是32Kbps

AVEncoderBitRatePerChannelKey设置无用

// 音频的编码比特率 BPS传输速率 一般为128kbps
[recordSettings setValue:[NSNumber numberWithInt:128000] forKey:AVEncoderBitRateKey];

这种设置也无用

[recordSettings setValue:[NSNumber numberWithInt:128000] forKey:AVEncoderBitRatePerChannelKey];
[recordSettings setValue:AVAudioBitRateStrategy_Constant forKey:AVEncoderBitRateStrategyKey];

百度,谷歌都搜不到原因所在,有大神可以解答下吗?急!


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