ERROR: Failed to build 'av' when getting requirements to build wheel

[mcmikey101]

Using python 3.9, pip 25.3

(.venv) PS C:\Users\user\Desktop\projects\openvoice_lib\OpenVoice> pip install -e .

Obtaining file:///C:/Users/user/Desktop/projects/openvoice_lib/OpenVoice
Installing build dependencies ... done
Checking if build backend supports build_editable ... done
Getting requirements to build editable ... done
Preparing editable metadata (pyproject.toml) ... done
Collecting librosa==0.9.1 (from MyShell-OpenVoice==0.0.0)
Using cached librosa-0.9.1-py3-none-any.whl.metadata (6.9 kB)
Collecting faster-whisper==0.9.0 (from MyShell-OpenVoice==0.0.0)
Using cached faster_whisper-0.9.0-py3-none-any.whl.metadata (11 kB)
Collecting pydub==0.25.1 (from MyShell-OpenVoice==0.0.0)
Using cached pydub-0.25.1-py2.py3-none-any.whl.metadata (1.4 kB)
Collecting wavmark==0.0.3 (from MyShell-OpenVoice==0.0.0)
Using cached wavmark-0.0.3-py3-none-any.whl.metadata (5.0 kB)
Collecting numpy==1.22.0 (from MyShell-OpenVoice==0.0.0)
Using cached numpy-1.22.0-cp39-cp39-win_amd64.whl.metadata (2.1 kB)
Collecting eng_to_ipa==0.0.2 (from MyShell-OpenVoice==0.0.0)
Using cached eng_to_ipa-0.0.2-py3-none-any.whl
Collecting inflect==7.0.0 (from MyShell-OpenVoice==0.0.0)
Using cached inflect-7.0.0-py3-none-any.whl.metadata (21 kB)
Collecting unidecode==1.3.7 (from MyShell-OpenVoice==0.0.0)
Using cached Unidecode-1.3.7-py3-none-any.whl.metadata (13 kB)
Collecting whisper-timestamped==1.14.2 (from MyShell-OpenVoice==0.0.0)
Using cached whisper_timestamped-1.14.2-py3-none-any.whl.metadata (1.2 kB)
Collecting pypinyin==0.50.0 (from MyShell-OpenVoice==0.0.0)
Using cached pypinyin-0.50.0-py2.py3-none-any.whl.metadata (12 kB)
Collecting cn2an==0.5.22 (from MyShell-OpenVoice==0.0.0)
Using cached cn2an-0.5.22-py3-none-any.whl.metadata (10 kB)
Collecting jieba==0.42.1 (from MyShell-OpenVoice==0.0.0)
Using cached jieba-0.42.1-py3-none-any.whl
Collecting gradio==3.48.0 (from MyShell-OpenVoice==0.0.0)
Using cached gradio-3.48.0-py3-none-any.whl.metadata (17 kB)
Collecting langid==1.1.6 (from MyShell-OpenVoice==0.0.0)
Using cached langid-1.1.6-py3-none-any.whl
Requirement already satisfied: setuptools>=47.3.1 in c:\users\user\desktop\projects\openvoice_lib\openvoice.venv\lib\site-packages (from cn2an==0.5.22->MyShell-OpenVoice==0.0.0) (80.9.0)
Collecting proces>=0.1.3 (from cn2an==0.5.22->MyShell-OpenVoice==0.0.0)
Using cached proces-0.1.7-py3-none-any.whl.metadata (3.3 kB)
Collecting av==10.* (from faster-whisper==0.9.0->MyShell-OpenVoice==0.0.0)
Using cached av-10.0.0.tar.gz (2.4 MB)
Installing build dependencies ... done
Getting requirements to build wheel ... error
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> [72 lines of output]
Compiling av\buffer.pyx because it changed.
[1/1] Cythonizing av\buffer.pyx
Compiling av\bytesource.pyx because it changed.
[1/1] Cythonizing av\bytesource.pyx
Compiling av\descriptor.pyx because it changed.
[1/1] Cythonizing av\descriptor.pyx
Compiling av\dictionary.pyx because it changed.
[1/1] Cythonizing av\dictionary.pyx
warning: av\enum.pyx:321:4: nonzero was removed in Python 3; use bool instead
Compiling av\enum.pyx because it changed.
[1/1] Cythonizing av\enum.pyx
Compiling av\error.pyx because it changed.
[1/1] Cythonizing av\error.pyx
Compiling av\format.pyx because it changed.
[1/1] Cythonizing av\format.pyx
Compiling av\frame.pyx because it changed.
[1/1] Cythonizing av\frame.pyx
performance hint: av\logging.pyx:232:0: Exception check on 'log_callback' will always require the GIL to be acquired.
Possible solutions:
1. Declare 'log_callback' as 'noexcept' if you control the definition and you're sure you don't want the function to raise exceptions.
2. Use an 'int' return type on 'log_callback' to allow an error code to be returned.

  Error compiling Cython file:
  ------------------------------------------------------------
  ...
  cdef const char *log_context_name(void *ptr) nogil:
      cdef log_context *obj = <log_context*>ptr
      return obj.name

  cdef lib.AVClass log_class
  log_class.item_name = log_context_name
                        ^
  ------------------------------------------------------------

  av\logging.pyx:216:22: Cannot assign type 'const char *(void *) except? 0 nogil' to 'const char *(*)(void *) noexcept nogil'. Exception values are incompatible. Suggest adding 'noexcept' to the type of 'log_context_name'.

  Error compiling Cython file:
  ------------------------------------------------------------
  ...

  # Start the magic!
  # We allow the user to fully disable the logging system as it will not play
  # nicely with subinterpreters due to FFmpeg-created threads.
  if os.environ.get('PYAV_LOGGING') != 'off':
      lib.av_log_set_callback(log_callback)
                              ^
  ------------------------------------------------------------

  av\logging.pyx:351:28: Cannot assign type 'void (void *, int, const char *, va_list) except * nogil' to 'av_log_callback' (alias of 'void (*)(void *, int, const char *, va_list) noexcept nogil'). Exception values are incompatible. Suggest adding 'noexcept' to the type of 'log_callback'.
  Compiling av\logging.pyx because it changed.
  [1/1] Cythonizing av\logging.pyx
  Traceback (most recent call last):
    File "c:\users\user\desktop\projects\openvoice_lib\openvoice\.venv\lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 389, in <module>
      main()
    File "c:\users\user\desktop\projects\openvoice_lib\openvoice\.venv\lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 373, in main
      json_out["return_val"] = hook(**hook_input["kwargs"])
    File "c:\users\user\desktop\projects\openvoice_lib\openvoice\.venv\lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 143, in get_requires_for_build_wheel
      return hook(config_settings)
    File "C:\Users\user\AppData\Local\Temp\pip-build-env-54egqeth\overlay\Lib\site-packages\setuptools\build_meta.py", line 331, in get_requires_for_build_wheel
      return self._get_build_requires(config_settings, requirements=[])
    File "C:\Users\user\AppData\Local\Temp\pip-build-env-54egqeth\overlay\Lib\site-packages\setuptools\build_meta.py", line 301, in _get_build_requires
      self.run_setup()
    File "C:\Users\user\AppData\Local\Temp\pip-build-env-54egqeth\overlay\Lib\site-packages\setuptools\build_meta.py", line 512, in run_setup
      super().run_setup(setup_script=setup_script)
    File "C:\Users\user\AppData\Local\Temp\pip-build-env-54egqeth\overlay\Lib\site-packages\setuptools\build_meta.py", line 317, in run_setup
      exec(code, locals())
    File "<string>", line 157, in <module>
    File "C:\Users\user\AppData\Local\Temp\pip-build-env-54egqeth\overlay\Lib\site-packages\Cython\Build\Dependencies.py", line 1150, in cythonize
      cythonize_one(*args)
    File "C:\Users\user\AppData\Local\Temp\pip-build-env-54egqeth\overlay\Lib\site-packages\Cython\Build\Dependencies.py", line 1294, in cythonize_one
      raise CompileError(None, pyx_file)
  Cython.Compiler.Errors.CompileError: av\logging.pyx
  [end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed to build 'av' when getting requirements to build wheel

Please help

[dosubot]

Hi @mcmikey101! I'm Dosu and I’m helping the OpenVoice team.

The error building the 'av' package is caused by Cython compilation issues in av/logging.pyx, specifically related to exception signatures and the need for noexcept in function declarations. This is a known problem and is often due to incompatibilities between PyAV (av), Cython, and/or Python versions example.

A workaround that has helped others is to use a Python 3.9 environment, remove the version pin for faster-whisper in requirements.txt, install the requirements, and rerun the installation after an initial failure details. This can resolve dependency conflicts that trigger the Cython errors.

There are no official Windows-specific installation instructions or workarounds for 'av' in the OpenVoice documentation. If you continue to see this error, check if a pre-built wheel for av==10.0.0 is available for your Python and OS version, as building from source is prone to these issues. If not, you may need to experiment with Cython versions or try the workaround above.

To reply, just mention @dosu.

---

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[ajilk]

I am all seeing the same issue on macOS. I tried using conda and python -m venv to create the environment resulting in the same issue.

Python 3.9.24
pip 25.2 from /opt/homebrew/anaconda3/envs/openvoice/lib/python3.9/site-packages/pip (python 3.9)
ProductName:		macOS
ProductVersion:		26.0.1
BuildVersion:		25A362

[SollyBunny]

ignore the AI, it's stupid

PyAV-Org/PyAV#1177
solution was downgrade to 3.11.6, but we are using 3.9.25
PyAV-Org/PyAV#1140
workaround was force cython <3.0

echo 'cython<3.0' > constraint.txt
export PIP_CONSTRAINT=constraint.txt
pip install -e .

partially works

the new error points to
huggingface/lerobot#941
the solution is something with ffmpeg but which versions work is different for different people (6.1.1 and 7.1.1 but neither work for me), every version gets a different error ):

the solution for me was in requirements.txt and setup.py change the faster-whisper version to 1.2.1 (most recent version as of writing)

[DanielTowerz]

Using ffmpeg 5 and this:

echo 'cython<3.0' > constraint.txt
export PIP_CONSTRAINT=constraint.txt
pip install -e .

Worked for me in a macbook m1, macos Tahoe.

[robertor4]

Thanks @SollyBunny . This solved it for me on WSL Ubuntu

[mcmikey101]

@SollyBunny solution works, thank you!

[primalkriek]

you need to remove the version pin from faster-whisper in the setup.py and requirements.txt as @SollyBunny has pointed out.
I did not use a version. worked for me.

M1 MBP, macOS Tahoe