Python处理音频

从video中抽取audio

from moviepy.editor import VideoFileClip
from pydub import AudioSegment

video_path = '/opt/audio/audios/video1.mp4'
audio_path = '/opt/audio/audios/video1.wav'  # 提取的音频保存路径

# 加载视频文件
video = VideoFileClip(video_path)

# 提取音频
audio = video.audio

# 保存音频文件
audio.write_audiofile(audio_path)


# 读取音频文件
sound = AudioSegment.from_wav(audio_path)

# 将音频转换为单声道
sound = sound.set_channels(1)
sound = sound.set_frame_rate(16000)

# 保存音频文件（单声道）

sound.export(audio_path, format="wav")

截取video

from pydub import AudioSegment

# 加载音频文件
audio = AudioSegment.from_file(
    "xxx/1.wav")

# 定义起始和结束时间（单位为毫秒）
start_time = 3000  
end_time = 28550   

# 截取音频
extracted = audio[start_time:end_time]

# 导出截取的音频
extracted.export(
    "xxx/3.wav", format="wav")

拼接音频

import os
from pydub import AudioSegment


base_path = f'{os.getcwd()}/audios/reduce_noise/video2/'
# 要拼接的音频的路径list
short_audio_files = []
for i in range(100, 105):
    path = base_path + str(i) + ".wav"
    wav = AudioSegment.from_file(path)
    duration_seconds = wav.duration_seconds
    short_audio_files.append(path)
# 声明一个空白音频
merged_audio = AudioSegment.empty()
# 遍历每个短音频文件并添加到合并后的音频中
for audio_file in short_audio_files:
    # 从文件加载短音频
    short_audio = AudioSegment.from_file(audio_file)
    # 将短音频追加到合并后的音频
    merged_audio = merged_audio.append(short_audio, crossfade=0)
    
# 保存合并后的音频为一个长音频文件
merged_audio.export(f"{base_path}merged_audio.wav", format="wav")