babysor/MockingBird · error

all of the f0 values are 0.

Error message

all of the f0 values are 0.

What it means

Error "all of the f0 values are 0." thrown in babysor/MockingBird.

Source

Thrown at utils/f0_utils.py:90

    return lpf_x


def convert_continuos_f0(f0):
    """CONVERT F0 TO CONTINUOUS F0

    Args:
        f0 (ndarray): original f0 sequence with the shape (T)

    Return:
        (ndarray): continuous f0 with the shape (T)
    """
    # get uv information as binary
    uv = np.float32(f0 != 0)

    # get start and end of f0
    if (f0 == 0).all():
        logging.warn("all of the f0 values are 0.")
        return uv, f0
    start_f0 = f0[f0 != 0][0]
    end_f0 = f0[f0 != 0][-1]

    # padding start and end of f0 sequence
    start_idx = np.where(f0 == start_f0)[0][0]
    end_idx = np.where(f0 == end_f0)[0][-1]
    f0[:start_idx] = start_f0
    f0[end_idx:] = end_f0

    # get non-zero frame index
    nz_frames = np.where(f0 != 0)[0]

    # perform linear interpolation
    f = interp1d(nz_frames, f0[nz_frames])
    cont_f0 = f(np.arange(0, f0.shape[0]))

    return uv, cont_f0

View on GitHub (pinned to 28dc5e14f1)

When it happens

Trigger: Thrown at utils/f0_utils.py:90 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of babysor/MockingBird@28dc5e14f1 (2026-08-27). Data as JSON: /api/errors/3349e86682dafd2e. Report an issue: GitHub.