【Python】音频合并与切分——采用moviepy包实现_moviepy音频切片

 注：moviepy包也可以进行视频的合并和切分，暂时没有需求，所以不予实现。

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# 内容描述：采用moviepy包进行音频的合并和切分
# Author: AbaloneVH     Version: 2024/03/04 14:10
# 前置要求：采用 pip install moviepy 安装该包
# 具体功能
#   1. 根据给定子音频时长切分音频。
#       切分后的音频名为原音频名加“_”和序号。除最后一个子音频外，所有子音频的时长都是给定的子音频时长。
#       示例：audio_split_by_duration(“D:/Desktop/a.mp3”, split_duration=120)  # 子音频时长为 120 秒
#   2. 根据给定子音频大小切分音频。
#       切分后的音频名为原音频名加“_”和序号。除最后一个子音频外，所有子音频的大小均不超过给定子音频大小。
#       【目前的切分方式为按时长均匀切分，该优化方式可以根据需求进一步优化】
#       示例：audio_split_by_size(“D:/Desktop/a.mp3”, split_size=1024*2)  # 子音频大小不超过 2 MB
#   3. 根据给定的子音频列表，按顺序拼接给定的子音频。
#       需指定拼接后音频的名称。
#       示例：audio_concat([“D:/Desktop/a.mp3”, “D:/Desktop/b.mp3”], file_concat_name=“D:/Desktop/ab.mp3”)
#           拼接”a.mp3“和”b.mp3“文件，得到的文件为”ab.mp3”

import os
import numpy as np
from moviepy.editor import *
 
 
 
def audio_split_by_duration(file_name, split_duration=60):
    """
        Split the audio file into segments with the given duration.
        The split segments are with the same extension name as the original file.
        Author: AbaloneVH   Version: 2024/03/04 14:10
    Parameters
    -----------
    file_name: name of the file.
    split_duration: duration for each segment. The duration of the last segment may be less than it. Default: 60 s.
    Examples
    -----------
    >> audio_split_by_duration(“D:/Desktop/a.mp3”, split_duration=120)  # split_duration is 120 s.
    """
 
    audio = AudioFileClip(file_name)  # load the audio file
    name, ext = os.path.splitext(file_name)
    total_duration = audio.duration  # total duration of the audio file
 
    split_points = list(range(0, int(total_duration), split_duration))
    split_points.append(int(total_duration))
    file_list = []
    for i in range(len(split_points) - 1):
        start_time = split_points[i]
        end_time = split_points[i + 1]
        split_audio = audio.subclip(start_time, end_time)  # split the audio file
        split_audio.write_audiofile(f"{name}_{i}"+ext)  # write the split segments
        file_list.append(f"{name}_{i}"+ext)
    audio.close()
    return file_list
 
 
def audio_split_by_size(file_name, split_size=1024):
    """
        Split the audio file into segments with the given size.
        The split segments are with the same extension name as the original file.
        Author: AbaloneVH   Version: 2024/03/04 14:10
    Parameters
    -----------
    file_name: name of the file.
    split_size: maximal size of each segment. Unit: KB. Default: 1024 KB, i.e., 1 MB.
    Examples
    -----------
    >> audio_split_by_size(“D:/Desktop/a.mp3”, split_size=1024*2)  # split_size = 2MB
    """
 
    audio = AudioFileClip(file_name)  # load the audio file
    name, ext = os.path.splitext(file_name)
    file_size = os.path.getsize(file_name)/1024  # unit: KB
    num_seg = int(np.ceil(file_size/split_size)) + 1
 
    total_duration = audio.duration
    split_duration = int(np.ceil(total_duration/num_seg))
    split_points = list(range(0, int(total_duration), split_duration))
    split_points.append(int(total_duration))
    file_list = []
    for i in range(len(split_points) - 1):
        start_time = split_points[i]
        end_time = split_points[i + 1]
        split_audio = audio.subclip(start_time, end_time)  # split the audio file
        split_audio.write_audiofile(f"{name}_{i}"+ext)  # write the split segments
        file_list.append(f"{name}_{i}"+ext)
    audio.close()
    return file_list
 
 
def audio_concat(file_list, file_concat_name):
    """
        Concatenate the audio files into one
        Author: AbaloneVH   Version: 2024/03/04 14:10
    Parameters
    -----------
    file_list: name list of the audio files to be concatenated
    file_concat_name: name of the concatenated audio file
    Examples
    -----------
    >> audio_concat([“D:/Desktop/a.mp3”, “D:/Desktop/b.mp3”], file_concat_name=“D:/Desktop/ab.mp3”)
    """
    audio_clips = []
    for sub_file__name in file_list:
        audio_clips.append(AudioFileClip(sub_file__name))
    audio_all = concatenate_audioclips(audio_clips)
    audio_all.write_audiofile(file_concat_name)
    return file_concat_name
 
 
# Example
# 1. Split "P1.mp3" into segments, the size of each segment is less than 2 MB
fileName = "P1.mp3"  # name of the audio file to be split
fileList = audio_split_by_size(fileName, split_size=1024*2)
 
# 2. Concatenate the first two segments into one audio file "P_all.mp3"
fileConcatName = "P_all.mp3"  # name of the concatenated audio file
print(audio_concat(fileList[:2], fileConcatName))

参考资料：【Python】如何高效把一个mp3切割成多个30秒的片段（附实操）_python mp3切片-CSDN博客