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使用iphone的拍摄的视频。很容易有音量超出

iPhone的录音能力

I'm 99.9% sure it's 48kHz, 16-bit Mono (or Stereo if you have a plug-in mic of some sort which supports Stereo). I use the FiRe app which is one of the most comprehensive and professional-geared recording apps, and that's the max it supports. On older iPhones like the 3G I believe it was only 44.1kHz.

参考资料：
* 自然音を録音したいのですが https://oshiete.goo.ne.jp/qa/7636800.html