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I have a large amount of mp3 files that are not the correct sample rate for the external hardware I want to use them in. Is there any way of changing them all in one go rather than file by file through audacity?

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1 回答 1

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你应该提到你正在使用什么操作系统......这适用于linux

sudo apt install libav-tools  #  install needed tool

// 显示一个文件的内容

avprobe mysong.mp3

其输出的底部说

Duration: 00:00:01.65, start: 0.000000, bitrate: 192 kb/s
Stream #0:0: Audio: mp3, 44100 Hz, mono, s16p, 192 kb/s

好的，它是一个正常的 CD 质量 44.1kHz，所以让采样率降低一半到 22050kHz

avconv -i mysong.mp3   -ar 22050  mysong_22k.mp3

验证我们现在拥有的

avprobe mysong_22k.mp3 

Duration: 00:00:01.70, start: 0.050113, bitrate: 33 kb/s
Stream #0:0: Audio: mp3, 22050 Hz, mono, s16p, 32 kb/s

到目前为止一切顺利，现在让我们将其包装起来以查看一个目录中的所有文件

#!/bin/bash

for curr_song in $( ls *mp3 ); do

    echo
    echo "current specs on song -->${curr_song}<--"
    echo

    curr_song_base_name=${curr_song%.*}

    echo curr_song_base_name $curr_song_base_name

    curr_new_output=${curr_song_base_name}_22k.mp3

    echo "avprobe  $curr_song "
          avprobe "$curr_song" 
    echo

    avconv -i ${curr_song}  -ar 22050  ${curr_new_output}

    echo now confirm it worked 
    echo

    avprobe ${curr_new_output}

done

这应该让你启动并运行......它对于没有空格的歌曲名称运行良好......代码在处理文件名中的空格时涉及更多......如果你有空格，那么我会修改代码.. . 它通过在文件名末尾添加 _22k 来剪切每个输出文件，因此

input   songhere.mp3
output  songhere_22k.mp3

它很容易给它一个不同的输出目录

于 2018-03-16T03:51:44.127 回答