无法使用 ffmpeg 或 moviepy 将视频转换为音频

Question

I want to convert a mp4 video file to mp3/wav audio using python ffmpeg or moviepy. when I run this command

ffmpeg -i vid.mp4 -ar 44100 -vn audio.wav

It returns

Output file #0 does not contain any stream

Here is the full Log

ffmpeg version N-55702-g920046a Copyright (c) 2000-2013 the FFmpeg developers
  built on Aug 21 2013 18:10:00 with gcc 4.7.3 (GCC)
  configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52. 42.100 / 52. 42.100
  libavcodec     55. 29.100 / 55. 29.100
  libavformat    55. 14.101 / 55. 14.101
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 82.100 /  3. 82.100
  libswscale      2.  5.100 /  2.  5.100
  libswresample   0. 17.103 /  0. 17.103
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vid.mp4':
  Metadata:
    major_brand     : dash
    minor_version   : 0
    compatible_brands: iso6avc1mp41
    creation_time   : 2021-03-12 14:13:58
  Duration: 00:07:28.87, start: 0.000000, bitrate: 1199 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 1197 kb/s, 23.98 tbr, 24k tbn, 47.95 tbc
    Metadata:
      creation_time   : 2021-03-12 14:13:58
      handler_name    : ISO Media file produced by Google Inc.
Output #0, wav, to 'audio.wav':
  Metadata:
    major_brand     : dash
    minor_version   : 0
    compatible_brands: iso6avc1mp41
Output file #0 does not contain any stream

I searched the internet for this but could not find a solution

Please tell if there is a way to do this with ffmpeg or another way

I also tried to use moviepy but it was not successful.

Here is moviepy log

Traceback (most recent call last):
  File "path\to\file\script.py", line 3, in <module>
    clip.audio.write_audiofile(r'audio.mp3')
AttributeError: 'NoneType' object has no attribute 'write_audiofile'

this is my code for moviepy

import moviepy.editor as mp
clip = mp.VideoFileClip('vid.mp4')
clip.audio.write_audiofile(r'audio.mp3')

Answer 1

It must mean that the vid.mp4 files cannot be found by the program. Make sure that the vid.py file is in the same directory as the ffmpeg.exe (or make sure you cd into the same directory as the vid.mp4 file in your command prompt) and your python file.

Answer 2

I have been trying out moviepy, and can hopefully help you. Are you able to try this:

import moviepy.editor as mp
clip = mp.VideoFileClip('vid.mp4')
audio = clip.audio
audio.write_audiofile('audio.mp3')