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@yosmoc

OSXにSoXをインストールする

SoX - Sound eXchange

オーディオの変換ならなんでもやる賢いやつ。ピッチそのままで倍速変換等も可能

インストール

brew install lame
brew install sox

使い方

mp3をピッチそのままで1.5倍速に変換する例

sox src.mp3 dst.mp3 tempo 1.5

参考

http://qiita.com/cuzic/items/86f012bba8c17cc98aea
http://superuser.com/questions/246918/why-isnt-sox-able-to-convert-to-mp3

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