mirror of
https://github.com/Zulko/moviepy.git
synced 2021-07-27 01:17:47 +03:00
0751d072d9
* Add module docstrings except in FXs * Update flake8 config * Remove 'find_latest_imagemagick_version.py' * Add tests modules docstrings * Don't execute doctests for tests/ modules * Prevent test error in Windows
30 lines
882 B
Python
30 lines
882 B
Python
"""Cutting utilities working with audio."""
|
|
|
|
import numpy as np
|
|
|
|
|
|
def find_audio_period(clip, min_time=0.1, max_time=2, time_resolution=0.01):
|
|
"""Finds the period, in seconds of an audioclip.
|
|
|
|
Parameters
|
|
----------
|
|
|
|
min_time : float, optional
|
|
Minimum bound for the returned value.
|
|
|
|
max_time : float, optional
|
|
Maximum bound for the returned value.
|
|
|
|
time_resolution : float, optional
|
|
Numerical precision.
|
|
"""
|
|
chunksize = int(time_resolution * clip.fps)
|
|
chunk_duration = 1.0 * chunksize / clip.fps
|
|
# v denotes the list of volumes
|
|
v = np.array([(chunk ** 2).sum() for chunk in clip.iter_chunks(chunksize)])
|
|
v = v - v.mean()
|
|
corrs = np.correlate(v, v, mode="full")[-len(v) :]
|
|
corrs[: int(min_time / chunk_duration)] = 0
|
|
corrs[int(max_time / chunk_duration) :] = 0
|
|
return chunk_duration * np.argmax(corrs)
|