Python实现批量将MP3音频转为WAV格式详解

前言

本文提供批量将mp3格式的音频转为wav格式的工具代码，一如既往的实用主义。

环境依赖

ffmpeg环境安装，可以参考：

ffmpy安装：

pip install ffmpy -i https://pypi.douban.com/simple

代码

不废话，上代码。

#!/user/bin/env python
# coding=utf-8
"""
@project : batch-pro
@author  : 剑客阿良_aliang
@file   : audio_tool.py
@ide    : pycharm
@time   : 2021-12-21 14:48:18
"""
from ffmpy import ffmpeg
 
import os
 
 
# mp3转wav
def audio_transfor(audio_path: str, output_dir: str):
    ext = os.path.basename(audio_path).strip().split('.')[-1]
    if ext != 'mp3':
        raise exception('format is not mp3')
 
    result = os.path.join(output_dir, '{}.{}'.format(os.path.basename(audio_path).strip().split('.')[0], 'wav'))
    filter_cmd = '-f wav -ac 1 -ar 16000'
    ff = ffmpeg(
        inputs={
            audio_path: none}, outputs={
            result: filter_cmd})
    print(ff.cmd)
    ff.run()
    return result
 
 
def handle(audio_dir: str, output_dir: str):
    for x in os.listdir(audio_dir):
        audio_transfor(os.path.join(audio_dir, x), output_dir)

代码说明：

1、handle方法主要参数为：音频目录、输出目录。

2、audio_transfor方法主要参数为：音频文件地址、输出目录。

3、主要通过handle方法批量对mp3音频目录进行遍历处理。

4、会对音频文件的后缀进行判断，看是否为mp3。

验证一下

准备了10个mp3文件。

执行代码：

if __name__ == '__main__':
    handle('c:/users/xx/desktop/test1', 'c:/users/xx/desktop/test2')

执行过程

c:\users\huyi\.conda\envs\ai_detection\python.exe d:/spyder/batch-pro/audio_tool.py
ffmpeg -i c:/users/huyi/desktop/test1\1.mp3 -f wav -ac 1 -ar 16000 c:/users/huyi/desktop/test2\1.wav
ffmpeg version n4.3.1-20-g8a2acdc6da copyright (c) 2000-2020 the ffmpeg developers
built with gcc 9.3-win32 (gcc) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --extra-cflags=-dlibtwolame_static --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
libavutil      56. 51.100 / 56. 51.100
libavcodec     58. 91.100 / 58. 91.100
libavformat    58. 45.100 / 58. 45.100
libavdevice    58. 10.100 / 58. 10.100
libavfilter     7. 85.100 /  7. 85.100
libswscale      5.  7.100 /  5.  7.100
libswresample   3.  7.100 /  3.  7.100
libpostproc    55.  7.100 / 55.  7.100
[mp3 @ 000001ad059c4640] estimating duration from bitrate, this may be inaccurate
input #0, mp3, from 'c:/users/huyi/desktop/test1\1.mp3':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
encoder         : lavf57.71.100
duration: 00:08:20.95, start: 0.000000, bitrate: 64 kb/s
stream #0:0: audio: mp3, 44100 hz, stereo, fltp, 64 kb/s
stream mapping:
stream #0:0 -> #0:0 (mp3 (mp3float) -> pcm_s16le (native))
press [q] to stop, [?] for help
output #0, wav, to 'c:/users/huyi/desktop/test2\1.wav':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
isft            : lavf58.45.100
stream #0:0: audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 hz, mono, s16, 256 kb/s
metadata:
encoder         : lavc58.91.100 pcm_s16le
size=   15655kb time=00:08:20.95 bitrate= 256.0kbits/s speed= 896x    
video:0kb audio:15655kb subtitle:0kb other streams:0kb global headers:0kb muxing overhead: 0.000487%
ffmpeg -i c:/users/huyi/desktop/test1\10.mp3 -f wav -ac 1 -ar 16000 c:/users/huyi/desktop/test2\10.wav
ffmpeg version n4.3.1-20-g8a2acdc6da copyright (c) 2000-2020 the ffmpeg developers
built with gcc 9.3-win32 (gcc) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --extra-cflags=-dlibtwolame_static --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
libavutil      56. 51.100 / 56. 51.100
libavcodec     58. 91.100 / 58. 91.100
libavformat    58. 45.100 / 58. 45.100
libavdevice    58. 10.100 / 58. 10.100
libavfilter     7. 85.100 /  7. 85.100
libswscale      5.  7.100 /  5.  7.100
libswresample   3.  7.100 /  3.  7.100
libpostproc    55.  7.100 / 55.  7.100
[mp3 @ 0000021a839a4640] estimating duration from bitrate, this may be inaccurate
input #0, mp3, from 'c:/users/huyi/desktop/test1\10.mp3':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
encoder         : lavf57.71.100
duration: 00:12:50.25, start: 0.000000, bitrate: 64 kb/s
stream #0:0: audio: mp3, 44100 hz, stereo, fltp, 64 kb/s
stream mapping:
stream #0:0 -> #0:0 (mp3 (mp3float) -> pcm_s16le (native))
press [q] to stop, [?] for help
output #0, wav, to 'c:/users/huyi/desktop/test2\10.wav':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
isft            : lavf58.45.100
stream #0:0: audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 hz, mono, s16, 256 kb/s
metadata:
encoder         : lavc58.91.100 pcm_s16le
size=   24070kb time=00:12:50.24 bitrate= 256.0kbits/s speed= 862x    
video:0kb audio:24070kb subtitle:0kb other streams:0kb global headers:0kb muxing overhead: 0.000316%
ffmpeg -i c:/users/huyi/desktop/test1\2.mp3 -f wav -ac 1 -ar 16000 c:/users/huyi/desktop/test2\2.wav
ffmpeg version n4.3.1-20-g8a2acdc6da copyright (c) 2000-2020 the ffmpeg developers
built with gcc 9.3-win32 (gcc) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --extra-cflags=-dlibtwolame_static --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
libavutil      56. 51.100 / 56. 51.100
libavcodec     58. 91.100 / 58. 91.100
libavformat    58. 45.100 / 58. 45.100
libavdevice    58. 10.100 / 58. 10.100
libavfilter     7. 85.100 /  7. 85.100
libswscale      5.  7.100 /  5.  7.100
libswresample   3.  7.100 /  3.  7.100
libpostproc    55.  7.100 / 55.  7.100
[mp3 @ 000002900b784640] estimating duration from bitrate, this may be inaccurate
input #0, mp3, from 'c:/users/huyi/desktop/test1\2.mp3':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
encoder         : lavf57.71.100
duration: 00:09:36.24, start: 0.000000, bitrate: 64 kb/s
stream #0:0: audio: mp3, 44100 hz, stereo, fltp, 64 kb/s
stream mapping:
stream #0:0 -> #0:0 (mp3 (mp3float) -> pcm_s16le (native))
press [q] to stop, [?] for help
output #0, wav, to 'c:/users/huyi/desktop/test2\2.wav':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
isft            : lavf58.45.100
stream #0:0: audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 hz, mono, s16, 256 kb/s
metadata:
encoder         : lavc58.91.100 pcm_s16le
size=   18007kb time=00:09:36.23 bitrate= 256.0kbits/s speed= 879x    
ffmpeg -i c:/users/huyi/desktop/test1\3.mp3 -f wav -ac 1 -ar 16000 c:/users/huyi/desktop/test2\3.wav
video:0kb audio:18007kb subtitle:0kb other streams:0kb global headers:0kb muxing overhead: 0.000423%
ffmpeg version n4.3.1-20-g8a2acdc6da copyright (c) 2000-2020 the ffmpeg developers
built with gcc 9.3-win32 (gcc) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --extra-cflags=-dlibtwolame_static --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
libavutil      56. 51.100 / 56. 51.100
libavcodec     58. 91.100 / 58. 91.100
libavformat    58. 45.100 / 58. 45.100
libavdevice    58. 10.100 / 58. 10.100
libavfilter     7. 85.100 /  7. 85.100
libswscale      5.  7.100 /  5.  7.100
libswresample   3.  7.100 /  3.  7.100
libpostproc    55.  7.100 / 55.  7.100
[mp3 @ 00000238ce244640] estimating duration from bitrate, this may be inaccurate
input #0, mp3, from 'c:/users/huyi/desktop/test1\3.mp3':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
encoder         : lavf57.71.100
duration: 00:07:00.73, start: 0.000000, bitrate: 64 kb/s
stream #0:0: audio: mp3, 44100 hz, stereo, fltp, 64 kb/s
stream mapping:
stream #0:0 -> #0:0 (mp3 (mp3float) -> pcm_s16le (native))
press [q] to stop, [?] for help
output #0, wav, to 'c:/users/huyi/desktop/test2\3.wav':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
isft            : lavf58.45.100
stream #0:0: audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 hz, mono, s16, 256 kb/s
metadata:
encoder         : lavc58.91.100 pcm_s16le
size=   13148kb time=00:07:00.72 bitrate= 256.0kbits/s speed= 886x    
video:0kb audio:13148kb subtitle:0kb other streams:0kb global headers:0kb muxing overhead: 0.000579%
ffmpeg -i c:/users/huyi/desktop/test1\4.mp3 -f wav -ac 1 -ar 16000 c:/users/huyi/desktop/test2\4.wav
ffmpeg version n4.3.1-20-g8a2acdc6da copyright (c) 2000-2020 the ffmpeg developers
built with gcc 9.3-win32 (gcc) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --extra-cflags=-dlibtwolame_static --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
libavutil      56. 51.100 / 56. 51.100
libavcodec     58. 91.100 / 58. 91.100
libavformat    58. 45.100 / 58. 45.100
libavdevice    58. 10.100 / 58. 10.100
libavfilter     7. 85.100 /  7. 85.100
libswscale      5.  7.100 /  5.  7.100
libswresample   3.  7.100 /  3.  7.100
libpostproc    55.  7.100 / 55.  7.100
[mp3 @ 0000024ada3a4640] estimating duration from bitrate, this may be inaccurate
input #0, mp3, from 'c:/users/huyi/desktop/test1\4.mp3':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
encoder         : lavf57.71.100
duration: 00:08:14.58, start: 0.000000, bitrate: 64 kb/s
stream #0:0: audio: mp3, 44100 hz, stereo, fltp, 64 kb/s
stream mapping:
stream #0:0 -> #0:0 (mp3 (mp3float) -> pcm_s16le (native))
press [q] to stop, [?] for help
output #0, wav, to 'c:/users/huyi/desktop/test2\4.wav':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
isft            : lavf58.45.100
stream #0:0: audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 hz, mono, s16, 256 kb/s
metadata:
encoder         : lavc58.91.100 pcm_s16le
size=   15456kb time=00:08:14.57 bitrate= 256.0kbits/s speed= 873x    
video:0kb audio:15456kb subtitle:0kb other streams:0kb global headers:0kb muxing overhead: 0.000493%
ffmpeg -i c:/users/huyi/desktop/test1\5.mp3 -f wav -ac 1 -ar 16000 c:/users/huyi/desktop/test2\5.wav
ffmpeg version n4.3.1-20-g8a2acdc6da copyright (c) 2000-2020 the ffmpeg developers
built with gcc 9.3-win32 (gcc) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --extra-cflags=-dlibtwolame_static --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
libavutil      56. 51.100 / 56. 51.100
libavcodec     58. 91.100 / 58. 91.100
libavformat    58. 45.100 / 58. 45.100
libavdevice    58. 10.100 / 58. 10.100
libavfilter     7. 85.100 /  7. 85.100
libswscale      5.  7.100 /  5.  7.100
libswresample   3.  7.100 /  3.  7.100
libpostproc    55.  7.100 / 55.  7.100
[mp3 @ 0000023e42064640] estimating duration from bitrate, this may be inaccurate
input #0, mp3, from 'c:/users/huyi/desktop/test1\5.mp3':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
encoder         : lavf57.71.100
duration: 00:07:08.67, start: 0.000000, bitrate: 64 kb/s
stream #0:0: audio: mp3, 44100 hz, stereo, fltp, 64 kb/s
stream mapping:
stream #0:0 -> #0:0 (mp3 (mp3float) -> pcm_s16le (native))
press [q] to stop, [?] for help
output #0, wav, to 'c:/users/huyi/desktop/test2\5.wav':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
isft            : lavf58.45.100
stream #0:0: audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 hz, mono, s16, 256 kb/s
metadata:
encoder         : lavc58.91.100 pcm_s16le
size=   13396kb time=00:07:08.66 bitrate= 256.0kbits/s speed= 850x    
video:0kb audio:13396kb subtitle:0kb other streams:0kb global headers:0kb muxing overhead: 0.000569%
ffmpeg -i c:/users/huyi/desktop/test1\6.mp3 -f wav -ac 1 -ar 16000 c:/users/huyi/desktop/test2\6.wav
ffmpeg version n4.3.1-20-g8a2acdc6da copyright (c) 2000-2020 the ffmpeg developers
built with gcc 9.3-win32 (gcc) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --extra-cflags=-dlibtwolame_static --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
libavutil      56. 51.100 / 56. 51.100
libavcodec     58. 91.100 / 58. 91.100
libavformat    58. 45.100 / 58. 45.100
libavdevice    58. 10.100 / 58. 10.100
libavfilter     7. 85.100 /  7. 85.100
libswscale      5.  7.100 /  5.  7.100
libswresample   3.  7.100 /  3.  7.100
libpostproc    55.  7.100 / 55.  7.100
[mp3 @ 0000021c487e4640] estimating duration from bitrate, this may be inaccurate
input #0, mp3, from 'c:/users/huyi/desktop/test1\6.mp3':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
encoder         : lavf57.71.100
duration: 00:06:22.93, start: 0.000000, bitrate: 64 kb/s
stream #0:0: audio: mp3, 44100 hz, stereo, fltp, 64 kb/s
stream mapping:
stream #0:0 -> #0:0 (mp3 (mp3float) -> pcm_s16le (native))
press [q] to stop, [?] for help
output #0, wav, to 'c:/users/huyi/desktop/test2\6.wav':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
isft            : lavf58.45.100
stream #0:0: audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 hz, mono, s16, 256 kb/s
metadata:
encoder         : lavc58.91.100 pcm_s16le
size=   11967kb time=00:06:22.92 bitrate= 256.0kbits/s speed= 883x    
video:0kb audio:11967kb subtitle:0kb other streams:0kb global headers:0kb muxing overhead: 0.000637%
ffmpeg -i c:/users/huyi/desktop/test1\7.mp3 -f wav -ac 1 -ar 16000 c:/users/huyi/desktop/test2\7.wav
ffmpeg version n4.3.1-20-g8a2acdc6da copyright (c) 2000-2020 the ffmpeg developers
built with gcc 9.3-win32 (gcc) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --extra-cflags=-dlibtwolame_static --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
libavutil      56. 51.100 / 56. 51.100
libavcodec     58. 91.100 / 58. 91.100
libavformat    58. 45.100 / 58. 45.100
libavdevice    58. 10.100 / 58. 10.100
libavfilter     7. 85.100 /  7. 85.100
libswscale      5.  7.100 /  5.  7.100
libswresample   3.  7.100 /  3.  7.100
libpostproc    55.  7.100 / 55.  7.100
[mp3 @ 000001bd2d4e4640] estimating duration from bitrate, this may be inaccurate
input #0, mp3, from 'c:/users/huyi/desktop/test1\7.mp3':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
encoder         : lavf57.71.100
duration: 00:08:09.64, start: 0.000000, bitrate: 64 kb/s
stream #0:0: audio: mp3, 44100 hz, stereo, fltp, 64 kb/s
stream mapping:
stream #0:0 -> #0:0 (mp3 (mp3float) -> pcm_s16le (native))
press [q] to stop, [?] for help
output #0, wav, to 'c:/users/huyi/desktop/test2\7.wav':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
isft            : lavf58.45.100
stream #0:0: audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 hz, mono, s16, 256 kb/s
metadata:
encoder         : lavc58.91.100 pcm_s16le
size=   15301kb time=00:08:09.63 bitrate= 256.0kbits/s speed= 837x    
ffmpeg -i c:/users/huyi/desktop/test1\8.mp3 -f wav -ac 1 -ar 16000 c:/users/huyi/desktop/test2\8.wav
video:0kb audio:15301kb subtitle:0kb other streams:0kb global headers:0kb muxing overhead: 0.000498%
ffmpeg version n4.3.1-20-g8a2acdc6da copyright (c) 2000-2020 the ffmpeg developers
built with gcc 9.3-win32 (gcc) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --extra-cflags=-dlibtwolame_static --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
libavutil      56. 51.100 / 56. 51.100
libavcodec     58. 91.100 / 58. 91.100
libavformat    58. 45.100 / 58. 45.100
libavdevice    58. 10.100 / 58. 10.100
libavfilter     7. 85.100 /  7. 85.100
libswscale      5.  7.100 /  5.  7.100
libswresample   3.  7.100 /  3.  7.100
libpostproc    55.  7.100 / 55.  7.100
[mp3 @ 0000026043684640] estimating duration from bitrate, this may be inaccurate
input #0, mp3, from 'c:/users/huyi/desktop/test1\8.mp3':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
encoder         : lavf57.71.100
duration: 00:08:05.04, start: 0.000000, bitrate: 64 kb/s
stream #0:0: audio: mp3, 44100 hz, stereo, fltp, 64 kb/s
stream mapping:
stream #0:0 -> #0:0 (mp3 (mp3float) -> pcm_s16le (native))
press [q] to stop, [?] for help
output #0, wav, to 'c:/users/huyi/desktop/test2\8.wav':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
isft            : lavf58.45.100
stream #0:0: audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 hz, mono, s16, 256 kb/s
metadata:
encoder         : lavc58.91.100 pcm_s16le
size=   15158kb time=00:08:05.04 bitrate= 256.0kbits/s speed= 614x    
video:0kb audio:15158kb subtitle:0kb other streams:0kb global headers:0kb muxing overhead: 0.000503%
ffmpeg -i c:/users/huyi/desktop/test1\9.mp3 -f wav -ac 1 -ar 16000 c:/users/huyi/desktop/test2\9.wav
ffmpeg version n4.3.1-20-g8a2acdc6da copyright (c) 2000-2020 the ffmpeg developers
built with gcc 9.3-win32 (gcc) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --extra-cflags=-dlibtwolame_static --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
libavutil      56. 51.100 / 56. 51.100
libavcodec     58. 91.100 / 58. 91.100
libavformat    58. 45.100 / 58. 45.100
libavdevice    58. 10.100 / 58. 10.100
libavfilter     7. 85.100 /  7. 85.100
libswscale      5.  7.100 /  5.  7.100
libswresample   3.  7.100 /  3.  7.100
libpostproc    55.  7.100 / 55.  7.100
[mp3 @ 0000016a678d4640] estimating duration from bitrate, this may be inaccurate
input #0, mp3, from 'c:/users/huyi/desktop/test1\9.mp3':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
encoder         : lavf57.71.100
duration: 00:08:15.12, start: 0.000000, bitrate: 64 kb/s
stream #0:0: audio: mp3, 44100 hz, stereo, fltp, 64 kb/s
stream mapping:
stream #0:0 -> #0:0 (mp3 (mp3float) -> pcm_s16le (native))
press [q] to stop, [?] for help
output #0, wav, to 'c:/users/huyi/desktop/test2\9.wav':
metadata:
major_brand     : m4a 
minor_version   : 1
compatible_brands: isomiso2m4a mp42
isft            : lavf58.45.100
stream #0:0: audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 hz, mono, s16, 256 kb/s
metadata:
encoder         : lavc58.91.100 pcm_s16le
size=   15473kb time=00:08:15.12 bitrate= 256.0kbits/s speed= 680x    
video:0kb audio:15473kb subtitle:0kb other streams:0kb global headers:0kb muxing overhead: 0.000492%
process finished with exit code 0

结果目录：

ok，没什么问题。

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