音频处理工具 sox 使用

1. sox　使用方式

sudo apt-get install sox

通过　play 查看音频格式　play male_audio.wav

play WARN alsa: can't encode 0-bit Unknown or not applicable

male_audio.wav:

 File Size: 184k      Bit Rate: 706k
  Encoding: Signed PCM    
  Channels: 1 @ 16-bit   
Samplerate: 44100Hz      
Replaygain: off         
  Duration: 00:00:02.08  

In:100%  00:00:02.08 [00:00:00.00] Out:91.9k [      |      ]        Clip:0    
Done.

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sox 命令：

sox [global-options]
[format-options] infile1
[[format-options] infile2] ...
[format-options] outfile
[effect [effect-options]] ...
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2. 原始音频raw 转为wav 格式

• input.raw has single channel
• It uses 16-bit linear PCM
• Sample rate is 16kHz
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command:

sox -c 1  -e signed-integer  -b 16 -r 16000 input.raw
output.wav  remix 1
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3. 　交换音频的　左右声道

sox input.wav output.wav remix 2 1
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3.1 　生成三个声道，

且第二个声道中的数值　为０；

sox input.wav output.wav remix 1 0 1
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4. 　重采样与格式转换

4.1 重采样

sox input.wav -r 8000 output.wav
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4.2 　编码格式转换

Convert 16-bit linear PCM file to μ-law.

sox input.wav -e mu-law output.wav
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Convert from WAV to FLAC format.

sox input.wav output.flac
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5. ffmpeg

sudo apt install ffmpeg

Convert MP4 file to WAV:

ffmpeg -i input.mp4 output.wav
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