librosa: OSError: file not found

Description

Description

I face a problem when I follow the tutorial:

# Beat tracking example
from __future__ import print_function
import librosa

# 1. Get the file path to the included audio example
filename = librosa.util.example_audio_file()

# 2. Load the audio as a waveform `y`
#    Store the sampling rate as `sr`
y, sr = librosa.load(filename)

# 3. Run the default beat tracker
tempo, beat_frames = librosa.beat.beat_track(y=y, sr=sr)

print('Estimated tempo: {:.2f} beats per minute'.format(tempo))

# 4. Convert the frame indices of beat events into timestamps
beat_times = librosa.frames_to_time(beat_frames, sr=sr)

print('Saving output to beat_times.csv')
librosa.output.times_csv('beat_times.csv', beat_times)

Steps/Code to Reproduce

Expected Results

It may run without error

Actual Results

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/zhongyi/anaconda3/envs/tf-torch/lib/python3.6/site-packages/librosa/core/audio.py", line 119, in load
    with audioread.audio_open(os.path.realpath(path)) as input_file:
  File "/home/zhongyi/anaconda3/envs/tf-torch/lib/python3.6/site-packages/audioread/__init__.py", line 111, in audio_open
    return ffdec.FFmpegAudioFile(path)
  File "/home/zhongyi/anaconda3/envs/tf-torch/lib/python3.6/site-packages/audioread/ffdec.py", line 150, in __init__
    self._get_info()
  File "/home/zhongyi/anaconda3/envs/tf-torch/lib/python3.6/site-packages/audioread/ffdec.py", line 206, in _get_info
    raise IOError('file not found')
OSError: file not found

Versions

>>> import platform; print(platform.platform())
Linux-4.15.0-51-generic-x86_64-with-debian-buster-sid
>>> import sys; print("Python", sys.version)
Python 3.6.0 |Continuum Analytics, Inc.| (default, Dec 23 2016, 12:22:00) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)]
>>> import numpy; print("NumPy", numpy.__version__)
NumPy 1.13.3
>>> import scipy; print("SciPy", scipy.__version__)
SciPy 1.1.0
>>> import librosa; print("librosa", librosa.__version__)
librosa 0.6.3