如何在 .wav 文件的末尾添加几秒钟的静音？

问题描述

我有 1,440 个音频文件可以输入到神经网络中。问题是它们的长度并不相同。我使用了发布在以下位置的答案：

Adding silent frame to wav file using python

但它似乎不起作用。我想在我的文件末尾添加几秒钟的静音，然后将它们全部修剪为 5 秒长。有人可以帮我解决这个问题吗？

（我也尝试过使用 pysox，但这给了我 This install of SoX cannot process .wav files. 错误。）

我为此使用了 Google Colab。代码是：

import wave,os,glob
from pydub import AudioSegment
from pydub.playback import play

path = 'drive/MyDrive/Ravdess/Sad' #This is the folder from my Google Drive which has the audio files
count = 0
for filename in glob.glob(os.path.join(path,'*.wav')):
    w = wave.open(filename,'r')
    d = w.readframes(w.getnframes())
    frames = w.getnframes()
    rate = w.getframerate()
    duration = frames/float(rate)
    count+=1
    print(filename,"count =",count,"duration = ",duration)
    audio_in_file = filename
    audio_out_file = "out.wav"

    new_duration = duration
    #Only append silence until time = 5 seconds.

    one_sec = AudioSegment.silent(duration=2000) #duration in milliseconds
    song = AudioSegment.from_wav(audio_in_file)
    final_song = one_sec + song
    new_frames = w.getnframes()
    new_rate = w.getframerate()
    new_duration = new_frames/float(rate)
    final_song.export(audio_out_file,format="wav")
    print(final_song,"new duration = ",new_duration)

    w.close()

这给出了输出：

drive/MyDrive/Ravdess/Sad/03-01-04-01-02-01-01.wav count = 1 duration =  3.5035

<pydub.audio_segment.AudioSegment object at 0x7fd5b7ca06a0> count = 1 new duration =  3.5035

drive/MyDrive/Ravdess/Sad/03-01-04-01-02-02-01.wav count = 2 duration =  3.370041666666667

<pydub.audio_segment.AudioSegment object at 0x7fd5b7cbc860> count = 2 new duration =  3.370041666666667

... (and so on for all the files)

解决方法

既然您已经在使用 pydub，我会这样做：

from pydub import AudioSegment
from pydub.playback import play

input_wav_file   = "/path/to/input.wav"
output_wav_file  = "/path/to/output.wav"
target_wav_time  = 5 * 1000 # 5 seconds (or 5000 milliseconds)

original_segment = AudioSegment.from_wav(input_wav_file)
silence_duration = target_wav_time - len(original_segment)
silenced_segment = AudioSegment.silent(duration=silence_duration)
combined_segment = original_segment + silenced_segment

combined_segment.export(output_wav_file,format="wav")

audio-processing python