How to extract MP3 audio from MP4 video files?

Jane Medium ： In order to be able to process audio in video , Two methods of extracting audio from video are tested . One is to use format engineering software, the other is to use ffmpeg Software .

key word ： Video file , Audio file ,mp4,mp3

 

§01 carry Take audio

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1.1 Video source

   Today, in wechat, my friend sent me an interesting video . This video demonstrates that the fresh and elegant plucking music comes from the nine rubber bands on the lunch box , People can't help feeling Flying flowers and picking leaves can hurt people , Grass, wood, bamboo and stone are all swords , I will not deceive you .

▲ chart 1 Lunch box 、 chopsticks 、 elastic

   Now leave a question ：

• What is the frequency of each note in this piece of music ？
• Under certain assumptions , Whether the vibration frequency corresponding to each rubber band meets the requirements of musical syllables ？

1.2 Audio extraction

   To answer the above questions , The first step is to start from MP4 Extract the video and audio from the file . have access to Format Factory （Format Factory） Complete the extraction of audio data .

1.2.1 Use format factory to extract audio

（1） Download format engineering software

   from Format Factory （Format Factory） Download and install the latest version of software .

▲ chart 1.2.1 install Format Factory Software

（2） Separate the audio in the video file

   Use the “ ->MP3” take MP4 Separate the audio in the file .

▲ chart 1.2.2 utilize Format Factory Separate MP3

（3） Audio preprocessing

   utilize Audacity Software is separate MP3 Audio file preprocessing .

   Use the Special effects in growth Amplify the original audio waveform . The following is the amplified audio waveform .

▲ chart 1.2.3 utilize Audacity Preprocess audio files

1.2.2 utilize moviepy Extract audio

   stay bing In the use of “python extract MP4 sounds” Search for , You can get the following blog post ：

• How to Extract Audio from Video files (Mp3 From Mp4)

   Applications are given in the blog moviepy To extract audio data from video .

（1） Processing software

from headm import *                 # =

from moviepy.editor import *

def mp4tomp3(mp4file, mp3file):
    videoclip = VideoFileClip(mp4file)
    audioclip = videoclip.audio
    audioclip.write_audiofile(mp4file)
    audioclip.close()
    videoclip.close()

mp4filename = r'D:\Temp\WeChat_20220213170345.mp4'
mp3filename = mp4filename.split('.')[0] + '.mp3'
printt(mp4filename|, mp3filename:)

mp4tomp3(mp4filename, mp3filename)

（2） Running error

   An error occurred after running ：

---------- [PYTHON INFOR] ----------
MoviePy - Writing audio in D:\Temp\WeChat_20220213170345.mp4
chunk:   0%|                                 | 0/507 [00:00<?, ?it/s, now=None]
chunk:   0%|                                 | 0/507 [00:00<?, ?it/s, now=None]chunk:   4%|▉                      | 21/507 [00:00<00:02, 209.99it/s, now=None]Traceback (most recent call last):
  File "C:\Users\zhuoqing\Anaconda3\lib\site-packages\moviepy\audio\io\ffmpeg_audiowriter.py", line 74, in write_frames
    self.proc.stdin.write(frames_array.tobytes())
BrokenPipeError: [Errno 32] Broken pipe
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "D:\Temp\TEMP0001\test1.PY", line 25, in <module>
    mp4tomp3(mp4filename, mp3filename)
  File "D:\Temp\TEMP0001\test1.PY", line 15, in mp4tomp3
    audioclip.write_audiofile(mp4file)
  File "<C:\Users\zhuoqing\Anaconda3\lib\site-packages\decorator.py:decorator-gen-45>", line 2, in write_audiofile
  File "C:\Users\zhuoqing\Anaconda3\lib\site-packages\moviepy\decorators.py", line 54, in requires_duration
    return f(clip, *a, **k)
  File "C:\Users\zhuoqing\Anaconda3\lib\site-packages\moviepy\audio\AudioClip.py", line 210, in write_audiofile
    logger=logger)
  File "<C:\Users\zhuoqing\Anaconda3\lib\site-packages\decorator.py:decorator-gen-9>", line 2, in ffmpeg_audiowrite
  File "C:\Users\zhuoqing\Anaconda3\lib\site-packages\moviepy\decorators.py", line 54, in requires_duration
    return f(clip, *a, **k)
  File "C:\Users\zhuoqing\Anaconda3\lib\site-packages\moviepy\audio\io\ffmpeg_audiowriter.py", line 170, in ffmpeg_audiowrite
    writer.write_frames(chunk)
  File "C:\Users\zhuoqing\Anaconda3\lib\site-packages\moviepy\audio\io\ffmpeg_audiowriter.py", line 117, in write_frames
    raise IOError(error)
OSError: [Errno 32] Broken pipe
MoviePy error: FFMPEG encountered the following error while writing file D:\Temp\WeChat_20220213170345.mp4:
b"Invalid encoder type 'libx264'\r\n"
In case it helps, make sure you are using a recent version of FFMPEG (the versions in the Ubuntu/Debian repos are deprecated).
                                                                               Exception ignored in: <function FFMPEG_AudioWriter.__del__ at 0x0000000017880268>
Traceback (most recent call last):
  File "C:\Users\zhuoqing\Anaconda3\lib\site-packages\moviepy\audio\io\ffmpeg_audiowriter.py", line 132, in __del__
    self.close()
  File "C:\Users\zhuoqing\Anaconda3\lib\site-packages\moviepy\audio\io\ffmpeg_audiowriter.py", line 121, in close
    self.proc.stdin.close()
OSError: [Errno 22] Invalid argument

   This shows a problem , It needs to be installed correctly in the software FFMPEG Software .

   The question is Python extract wav from video file Also mentioned by netizens , How to avoid using ffmpeg.

My question is how could I extract wav audio track from video file, say video.avi? I read many articles and everywhere people suggest to use (from Python) ffmpeg as a subprocess (because there are no reliable python bindings to ffmpeg - the only hope was PyFFmpeg but i found it is unmaintaned now). I don’t know if it is right solution and i am looking for good one.

I looked to gstreamer and found it nice but unable to satisfy my needs – the only way I found to accomplish this from command line looks like、

   This situation has been found by netizens in the process of use that it must be installed FFMPEGA, such as For a while mp4 Extract and save the audio in the original directory python Script .

▲ chart 1.2.4 You can't get around it ffmpeg Software

   Even in Extract MP3 audio from Videos using a Python script take ffmpeg Repackaged as a function called to get MP4 Audio data in .

1.2.3 install ffmpeg

   Since I can't get around , Then install ffmpeg Software . stay How to Install FFmpeg on Windows The installation is given ffmpeg Methods .

（1） download ffmpeg

   stay ffmpeg Official website : https://ffmpeg.org/download.html Download the required software version .

▲ chart 1.2.5 FFMPEG Official download software

   Here are two Windows EXE files Download link ：

• Windows builds from gyan.dev
• Windows builds by btbN

   I don't know the difference between the two versions , Now choose the first ：builds from gyan.dev.

▲ chart 1.2.6 choice Windows EXE edition

▲ chart 1.2.7 Choose to download the distribution

   After downloading is a ZIP Compressed files ：

• D:\Temp\ffmpeg-5.0-essentials_build.zip

（2） Unzip the file

   utilize Windows Version of Bandizip Compress it .

   Decompression produces ffmpeg Catalog , It includes bin Catalog , It includes ffmpeg.exe Executable file .

└─ffmpeg-5.0-essentials_build
    │  LICENSE
    │  README.txt
    ├─bin
    │      ffmpeg.exe
    │      ffplay.exe
    │      ffprobe.exe
    ├─doc
    │      bootstrap.min.css
    │      default.css
    │      developer.html
    │      faq.html
    │      fate.html
    │      ffmpeg-all.html
    │      ffmpeg-bitstream-filters.html
    │      ffmpeg-codecs.html
    │      ffmpeg-devices.html
    │      ffmpeg-filters.html
    │      ffmpeg-formats.html
    │      ffmpeg-protocols.html
    │      ffmpeg-resampler.html
    │      ffmpeg-scaler.html
    │      ffmpeg-utils.html
    │      ffmpeg.html
    │      ffplay-all.html
    │      ffplay.html
    │      ffprobe-all.html
    │      ffprobe.html
    │      general.html
    │      git-howto.html
    │      libavcodec.html
    │      libavdevice.html
    │      libavfilter.html
    │      libavformat.html
    │      libavutil.html
    │      libswresample.html
    │      libswscale.html
    │      mailing-list-faq.html
    │      nut.html
    │      platform.html
    │      style.min.css
    └─presets
            libvpx-1080p.ffpreset
            libvpx-1080p50_60.ffpreset
            libvpx-360p.ffpreset
            libvpx-720p.ffpreset
            libvpx-720p50_60.ffpreset

（3） Add environment variables

   take ffmpeg Of bin Add in System settings Medium path variable . adopt edit Can be bin The catalog is pasted on path Last . Use a semicolon in the middle “;” separate .

▲ chart 1.2.8 Set environment variables of the system

（4） test FFMPEG

   Use the following command to extract the audio in the video ：

ffmpeg -i music.mp4 music.wav
ffmpeg -i music.mp4 music.mp3

   The above two commands can be generated separately music.wav, music.mp3 file .

 

※ carry Take a summary ※

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   by It can process audio in video , Two methods of extracting audio from video are tested . One is to use format engineering software, the other is to use ffmpeg Software .

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■ Links to related literature :

• Format Factory （Format Factory）
• How to Extract Audio from Video files (Mp3 From Mp4)
• Python extract wav from video file
• For a while mp4 Extract and save the audio in the original directory python Script
• Extract MP3 audio from Videos using a Python script
• How to Install FFmpeg on Windows
• ffmpeg Official website
• Windows Version of Bandizip

● Related chart Links :

• chart 1 Lunch box 、 chopsticks 、 elastic
• chart 1.2.1 install Format Factory Software
• chart 1.2.2 utilize Format Factory Separate MP3
• chart 1.2.3 utilize Audacity Preprocess audio files
• chart 1.2.4 You can't get around it ffmpeg Software
• chart 1.2.5 FFMPEG Official download software
• chart 1.2.6 choice Windows EXE edition
• chart 1.2.7 Choose to download the distribution
• chart 1.2.8 Set environment variables of the system