examples/beat_tracker.py
def beat_track(input_file, output_csv):
    '''Beat tracking function

    :parameters:
      - input_file : str
          Path to input audio file (wav, mp3, m4a, flac, etc.)

      - output_file : str
          Path to save beat event timestamps as a CSV file
    '''

    print('Loading ', input_file)
    y, sr = librosa.load(input_file, sr=22050)

    # Use a default hop size of 512 samples @ 22KHz ~= 23ms
    hop_length = 512

    # This is the window length used by default in stft
    print('Tracking beats')
    tempo, beats = librosa.beat.beat_track(y=y, sr=sr, hop_length=hop_length)

    print('Estimated tempo: {:0.2f} beats per minute'.format(tempo))

    # save output
    # 'beats' will contain the frame numbers of beat events.
    beat_times = librosa.frames_to_time(beats, sr=sr, hop_length=hop_length)

    print('Saving output to ', output_csv)
    librosa.output.times_csv(output_csv, beat_times)
    print('done!')
def beat_track(input_file, output_csv):
    '''Beat tracking function

    :parameters:
      - input_file : str
          Path to input audio file (wav, mp3, m4a, flac, etc.)

      - output_file : str
          Path to save beat event timestamps as a CSV file
    '''

    print('Loading ', input_file)
    y, sr = librosa.load(input_file, sr=22050)

    # Use a default hop size of 512 samples @ 22KHz ~= 23ms
    hop_length = 512

    # This is the window length used by default in stft
    print('Tracking beats')
    tempo, beats = librosa.beat.beat_track(y=y, sr=sr, hop_length=hop_length)

    print('Estimated tempo: {:0.2f} beats per minute'.format(tempo))

    # save output
    # 'beats' will contain the frame numbers of beat events.
    beat_times = librosa.frames_to_time(beats, sr=sr, hop_length=hop_length)

    print('Saving output to ', output_csv)
    librosa.output.times_csv(output_csv, beat_times)
    print('done!')
Beat tracking function

    :parameters:
      - input_file : str
          Path to input audio file (wav, mp3, m4a, flac, etc.)

      - output_file : str
          Path to save beat event timestamps as a CSV file