Try to install av==10.0.0 get error

[shangzh0]

Collecting av==10.0.0
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/format.pyx because it changed.
[1/1] Cythonizing av/format.pyx
Compiling av/error.pyx because it changed.
[1/1] Cythonizing av/error.pyx
Compiling av/dictionary.pyx because it changed.
[1/1] Cythonizing av/dictionary.pyx
Compiling av/utils.pyx because it changed.
[1/1] Cythonizing av/utils.pyx
Compiling av/stream.pyx because it changed.
[1/1] Cythonizing av/stream.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/bytesource.pyx because it changed.
[1/1] Cythonizing av/bytesource.pyx
Compiling av/_core.pyx because it changed.
[1/1] Cythonizing av/_core.pyx
Compiling av/packet.pyx because it changed.
[1/1] Cythonizing av/packet.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? NULL 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 "/mnt/shangzh/anaconda3/envs/viewcrafter/lib/python3.9/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
      main()
    File "/mnt/shangzh/anaconda3/envs/viewcrafter/lib/python3.9/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
      json_out['return_val'] = hook(**hook_input['kwargs'])
    File "/mnt/shangzh/anaconda3/envs/viewcrafter/lib/python3.9/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 118, in get_requires_for_build_wheel
      return hook(config_settings)
    File "/tmp/pip-build-env-k7d1lbzr/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 331, in get_requires_for_build_wheel
      return self._get_build_requires(config_settings, requirements=[])
    File "/tmp/pip-build-env-k7d1lbzr/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 301, in _get_build_requires
      self.run_setup()
    File "/tmp/pip-build-env-k7d1lbzr/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 512, in run_setup
      super().run_setup(setup_script=setup_script)
    File "/tmp/pip-build-env-k7d1lbzr/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 317, in run_setup
      exec(code, locals())
    File "<string>", line 157, in <module>
    File "/tmp/pip-build-env-k7d1lbzr/overlay/lib/python3.9/site-packages/Cython/Build/Dependencies.py", line 1153, in cythonize
      cythonize_one(*args)
    File "/tmp/pip-build-env-k7d1lbzr/overlay/lib/python3.9/site-packages/Cython/Build/Dependencies.py", line 1297, 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: subprocess-exited-with-error

[Master-cai]

@shangzh0 Hi, I encounter the same error, have u solved it?

[JrunDing]

This issue is caused by the version of pyav. You can install other dependencies in the requirements.txt firstly. Then, pip install av and av-15.1.0 will be installed (19 March 2026). Modify the function save_video in utils/pvd_utils.py:

def save_video(tensor_data, images_path, fps=8):
frames = tensor_data
if isinstance(frames, np.ndarray) is False:
frames = frames.cpu().numpy()
if frames.max() <= 1.0:
frames = (frames * 255).astype(np.uint8)
imageio.mimsave(images_path, frames, fps=fps)