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pydub

Pydub可以讓你用簡單的方式處理音頻卦溢。

Pydub提供了簡潔的高層接口单寂，極大的擴(kuò)展了python處理音頻文件的能力昏苏。

GitHub鏈接：pydub-github

GitHub:

You can open and save WAV files with pure python. For opening and saving non-wav files – like mp3 – you'll need ffmpeg or libav.

安裝

pip install pydub

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安裝依賴軟件

pydub的使用必須安裝對應(yīng)的依賴軟件ffmpeg或avconv

# ffmpeg
sudo apt-get install ffmpeg libavcodec-extra

驗(yàn)證是否安裝成功：

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API函數(shù)使用

打開接口

Open a WAV file

from pydub import AudioSegment

song = AudioSegment.from_wav("never_gonna_give_you_up.wav")

Open a mp3 file

song = AudioSegment.from_mp3("never_gonna_give_you_up.mp3")

Open a other file

ogg_version = AudioSegment.from_ogg("never_gonna_give_you_up.ogg")
flv_version = AudioSegment.from_flv("never_gonna_give_you_up.flv")

mp4_version = AudioSegment.from_file("never_gonna_give_you_up.mp4", "mp4")
wma_version = AudioSegment.from_file("never_gonna_give_you_up.wma", "wma")
aac_version = AudioSegment.from_file("never_gonna_give_you_up.aiff", "aac")

音頻操作

切割音頻

# pydub does things in milliseconds
ten_seconds = 10 * 1000

first_10_seconds = song[:ten_seconds]

last_5_seconds = song[-5000:]

分貝操作
分貝（decibel）是量度兩個相同單位之?dāng)?shù)量比例的計(jì)量單位浦译，主要用于度量聲音強(qiáng)度，常用dB表示叹俏。

# boost volume by 6dB
beginning = first_10_seconds + 6

# reduce volume by 3dB
end = last_5_seconds - 3

音頻鏈接
將一個文件添加到另一個文件的末尾

without_the_middle = beginning + end

音頻長度

without_the_middle.duration_seconds == 15.0

淡入淡出

# 1.5 second crossfade
with_style = beginning.append(end, crossfade=1500)

重復(fù)音頻

# repeat the clip twice
do_it_over = with_style * 2

再次淡入淡出

# 2 sec fade in, 3 sec fade out
awesome = do_it_over.fade_in(2000).fade_out(3000)

保存音頻

直接保存
所有ffmpeg支持的都支持

awesome.export("mashup.mp3", format="mp3")

用標(biāo)簽保存結(jié)果（元數(shù)據(jù)）

awesome.export("mashup.mp3", format="mp3", tags={'artist': 'Various artists', 'album': 'Best of 2011', 'comments': 'This album is awesome!'})

實(shí)例：

# -*- coding: utf-8 -*-
from glob import glob
from pydub import AudioSegment

playlist_songs = [AudioSegment.from_mp3(mp3_file) for mp3_file in glob("*.mp3")]

first_song = playlist_songs.pop(0)

# let's just include the first 30 seconds of the first song (slicing
# is done by milliseconds)
beginning_of_song = first_song[:30*1000]

playlist = beginning_of_song
for song in playlist_songs:

    # We don't want an abrupt stop at the end, so let's do a 10 second crossfades
    playlist = playlist.append(song, crossfade=(10 * 1000))

# let's fade out the end of the last song
playlist = playlist.fade_out(30)

# hmm I wonder how long it is... ( len(audio_segment) returns milliseconds )
playlist_length = len(playlist) / (1000*60)

# lets save it!
out_f = open("%s_minute_playlist.mp3" % playlist_length, 'wb')

playlist.export(out_f, format='mp3')

實(shí)戰(zhàn)

將mp3文件轉(zhuǎn)換成wav文件：

# -*- coding: utf-8 -*-
from pydub import AudioSegment
 
def trans_mp3_to_wav(filepath):
    song = AudioSegment.from_mp3(filepath)
    song.export("out.wav", format="wav")

if __name__ == "__main__":
    trans_mp3_to_wav("一剪梅.mp3")

參考

Python音頻處理庫 pydub