[help wanted]ffmpeg._run.Error: ffmpeg error (see stderr output for detail)

What do these errors represent, stderr is of no help.
How can I solve this?

OS: Windows 10
CPU: AMD Ryzen7 3700X
Memory: 32GB
GPU: NVIDIA GeForce RTX 2060

Traceback (most recent call last):
  File "F:\RVC-beta-v2-0528\my_utils.py", line 14, in load_audio
    ffmpeg.input(file, threads=0)
  File "F:\RVC-beta-v2-0528\runtime\lib\site-packages\ffmpeg\_run.py", line 325, in run
    raise Error('ffmpeg', out, err)
ffmpeg._run.Error: ffmpeg error (see stderr output for detail)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "F:\RVC-beta-v2-0528\infer-web.py", line 161, in vc_single
    audio = load_audio(input_audio_path, 16000)
  File "F:\RVC-beta-v2-0528\my_utils.py", line 19, in load_audio
    raise RuntimeError(f"Failed to load audio: {e}")
RuntimeError: Failed to load audio: ffmpeg error (see stderr output for detail)

Traceback (most recent call last):
  File "F:\RVC-beta-v2-0528\runtime\lib\site-packages\gradio\routes.py", line 321, in run_predict
    output = await app.blocks.process_api(
  File "F:\RVC-beta-v2-0528\runtime\lib\site-packages\gradio\blocks.py", line 1007, in process_api
    data = self.postprocess_data(fn_index, result["prediction"], state)
  File "F:\RVC-beta-v2-0528\runtime\lib\site-packages\gradio\blocks.py", line 953, in postprocess_data
    prediction_value = block.postprocess(prediction_value)
  File "F:\RVC-beta-v2-0528\runtime\lib\site-packages\gradio\components.py", line 2076, in postprocess
    processing_utils.audio_to_file(sample_rate, data, file.name)
  File "F:\RVC-beta-v2-0528\runtime\lib\site-packages\gradio\processing_utils.py", line 206, in audio_to_file
    data = convert_to_16_bit_wav(data)
  File "F:\RVC-beta-v2-0528\runtime\lib\site-packages\gradio\processing_utils.py", line 219, in convert_to_16_bit_wav
    if data.dtype in [np.float64, np.float32, np.float16]:
AttributeError: 'NoneType' object has no attribute 'dtype'

The traceback points to my_utils.py: load_audio and infer-web.py: vc_single; begin by reproducing the failure with the same input and inspecting the ffmpeg invocation and stderr. Determine which input or environment condition triggers the failure, and verify that the resolution prevents the later NoneType error in Gradio.