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：windows ffmpeg安装部署
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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