python处理音频文件(mp3)

今天aiping点读笔的MP3源文件出现声音大小不一致，而且需要将英文单词MP3与单词翻译MP3文件连接起来，刚开始使用ffmpeg效果很差。万能的gitgub再次证明了它的万能，我找到了pydub

1 网址:https://github.com/jiaaro/pydub

2 pydub需要依赖 libav或者ffmpeg

3 在mac环境下安装依赖：(二选一)

brew install libav --with-libvorbis --with-sdl --with-theora
将所有依赖都安装上~~
brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-frei0r --with-libass --with-libvo-aacenc --with-libvorbis--with-libvpx --with-opencore-amr --with-openjpeg --with-opus --with-rtmpdump --with-schroedinger --with-speex --with-theora --with-tools --with-fdk-aac --with-freetype --with-ffplay --with-ffplay --with-freetype --with-frei0r --with-libass --with-libbluray --with-libcaca --with-libquvi --with-libvidstab --with-libvo-aacenc --with-libvorbis --with-libvpx --with-opencore-amr --with-openjpeg --with-openssl --with-opus --with-rtmpdump --with-schroedinger --with-speex --with-theora --with-tools --with-x265

4 安装pydub:  pip install pydub

5 使用pydub:

            enPath = "%s%s/%s"%(enDir,file,enfile) #英文文件的路径
            cnPath = "%s%s/%s"%(cnDir,file,enfile.replace("en_w","cn_w"))#中文文件的路径
            targetPath = "%s%s/%s"%(toDir,file,enfile.replace("en_w","all")) #合并文件的路径
            #加载MP3文件
            song1 = AudioSegment.from_mp3(enPath)
            song2 = AudioSegment.from_mp3(cnPath)

            #取得两个MP3文件的声音分贝
            db1 = song1.dBFS
            db2 = song2.dBFS

            song1 = song1[300:] #从300ms开始截取英文MP3

            #调整两个MP3的声音大小，防止出现一个声音大一个声音小的情况
            dbplus = db1 - db2
            if dbplus < 0: # song1的声音更小
                song1+=abs(dbplus)
            elif dbplus > 0: #song2的声音更小
                song2+=abs(dbplus)

            #拼接两个音频文件
            song = song1 + song2

            #导出音频文件
            song.export(targetPath, format="mp3") #导出为MP3格式