使用Python通过FFmpeg转换MP3到WAV时遇FileNotFoundError的解决方法

问题重现 #

用户尝试用pydub将MP3转换为WAV，代码如下：

from pydub import AudioSegment

# Specify the path to the FFmpeg executable
ffmpeg_path = r"C:\Users\תמרה\AppData\Local\ffmpegio\ffmpeg-downloader\ffmpeg\bin\ffmpeg.exe"
AudioSegment.ffmpeg = ffmpeg_path
AudioSegment.ffprobe = ffmpeg_path

# Load the MP3 file
mp3_file = r"C:\Users\תמרה\Tea Time - Ofshane.mp3"
audio = AudioSegment.from_file(mp3_file, format="mp3")

# Export as WAV
wav_file = r"C:\Users\תמרה\Tea Time - Ofshane.wav"
audio.export(wav_file, format="wav")

运行后出现以下错误：

C:\Users\תמרה\PycharmProjects\spotify\venv\Scripts\python.exe "C:\Users\תמרה\PycharmProjects\spotify\file stuff.py" C:\ffmpeg-2023-05-29-git-45fa85a777-full_build\bin\ffmpeg.exe 
C:\Users\תמרה\PycharmProjects\spotify\venv\lib\site-packages\pydub\utils.py:170: RuntimeWarning: Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work
  warn("Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work", RuntimeWarning)
C:\Users\תמרה\PycharmProjects\spotify\venv\lib\site-packages\pydub\utils.py:198: RuntimeWarning: Couldn't find ffprobe or avprobe - defaulting to ffprobe, but may not work
  warn("Couldn't find ffprobe or avprobe - defaulting to ffprobe, but may not work", RuntimeWarning)
Traceback (most recent call last):
  File "C:\Users\תמרה\PycharmProjects\spotify\file stuff.py", line 12, in <module>
    audio = AudioSegment.from_file(mp3_file, format="mp3")
  File "C:\Users\תמרה\PycharmProjects\spotify\venv\lib\site-packages\pydub\audio_segment.py", line 728, in from_file
    info = mediainfo_json(orig_file, read_ahead_limit=read_ahead_limit)
  File "C:\Users\תמרה\PycharmProjects\spotify\venv\lib\site-packages\pydub\utils.py", line 274, in mediainfo_json
    res = Popen(command, stdin=stdin_parameter, stdout=PIPE, stderr=PIPE)
  File "C:\Users\תמרה\AppData\Local\Programs\Python\Python310\lib\subprocess.py", line 971, in __init__
True
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "C:\Users\תמרה\AppData\Local\Programs\Python\Python310\lib\subprocess.py", line 1440, in _execute_child
    hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
FileNotFoundError: [WinError 2] The system cannot find the file specified

Process finished with exit code 1

错误原因分析 #

1. FFprobe路径设置错误：ffmpeg和ffprobe是两个独立的可执行文件，你将AudioSegment.ffprobe也指向了ffmpeg.exe，导致pydub无法找到ffprobe工具。
2. 路径含非ASCII字符：用户名包含希伯来文，Windows系统下部分场景会出现Unicode路径解析问题，导致无法定位MP3文件或FFmpeg程序。
3. FFmpeg路径有效性存疑：需确认你指定的ffmpeg.exe路径是否真实存在。

解决步骤 #

1. 修正FFprobe路径 #

找到ffmpeg目录下的ffprobe.exe，单独设置其路径：

from pydub import AudioSegment

ffmpeg_path = r"C:\Users\תמרה\AppData\Local\ffmpegio\ffmpeg-downloader\ffmpeg\bin\ffmpeg.exe"
ffprobe_path = r"C:\Users\תמרה\AppData\Local\ffmpegio\ffmpeg-downloader\ffmpeg\bin\ffprobe.exe"
AudioSegment.ffmpeg = ffmpeg_path
AudioSegment.ffprobe = ffprobe_path

2. 规避非ASCII路径问题 #

将MP3文件移动到不含特殊字符的路径下，比如C:\temp\Tea Time - Ofshane.mp3，然后修改代码中的文件路径：

mp3_file = r"C:\temp\Tea Time - Ofshane.mp3"
wav_file = r"C:\temp\Tea Time - Ofshane.wav"

3. 验证FFmpeg路径有效性 #

打开命令提示符，直接输入你指定的ffmpeg路径，确认能正常运行：

"C:\Users\תמרה\AppData\Local\ffmpegio\ffmpeg-downloader\ffmpeg\bin\ffmpeg.exe" -version

如果提示找不到文件，说明路径错误，需重新定位FFmpeg的安装目录。

4. 备选方案：添加FFmpeg到系统PATH #

将FFmpeg的bin目录（比如C:\Users\תמרה\AppData\Local\ffmpegio\ffmpeg-downloader\ffmpeg\bin）添加到系统环境变量PATH中，这样pydub会自动检测到ffmpeg和ffprobe，无需手动设置路径。

修正后的完整代码示例 #

from pydub import AudioSegment

# 正确设置ffmpeg和ffprobe路径
ffmpeg_path = r"C:\Users\תמרה\AppData\Local\ffmpegio\ffmpeg-downloader\ffmpeg\bin\ffmpeg.exe"
ffprobe_path = r"C:\Users\תמרה\AppData\Local\ffmpegio\ffmpeg-downloader\ffmpeg\bin\ffprobe.exe"
AudioSegment.ffmpeg = ffmpeg_path
AudioSegment.ffprobe = ffprobe_path

# 使用不含非ASCII字符的路径
mp3_file = r"C:\temp\Tea Time - Ofshane.mp3"
audio = AudioSegment.from_file(mp3_file, format="mp3")

wav_file = r"C:\temp\Tea Time - Ofshane.wav"
audio.export(wav_file, format="wav")

内容的提问来源于stack exchange，提问作者avocado123123