pydub多次褪色后质量差

Question

我想生成锻炼mp3文件与音乐在背景和指示在一定的时间(前)。“用力推”，“再重复一遍!")

我用pico2wave生成指令，然后用pydub组装它们。

我这样做：

for timing,phrase in phrases.items():
        fileToAdd = pydub.AudioSegment.from_file(rep+"/"+str(timing)+".wav")
        finalFile = finalFile.fade(to_gain=-35, start=(timing*1000)-500, duration=500) # on diminue la chanson, une demi seconde avant
        finalFile = finalFile.fade(to_gain=+35, start=(timing*1000)+len(fileToAdd), duration=500) 
        fichierFinal = fichierFinal.overlay(fileToAdd,position=timing*1000) 

结果文件质量很差。我试着消除“褪色效应”，质量很好(但我听不清楚“指示”)

我怎么才能改变这个？我能很容易地使一个淡出和褪色的效果？

谢谢,

致以敬意，

Axel

Answer 1

我认为问题是，您正在减弱音频，然后再增强它(因此，您正在失去35分贝的动态范围，每次你衰减，然后提高)。

我认为一个更好的解决方案是分割音频，只减少你需要的部分(没有任何提升操作)。

您在这里所做的操作有时被称为“躲避”，所以我将在下面使用这个名称：

def duck(sound, position, duration, gain=-15.0, fade_duration=500):
    """
    sound - an AudioSegment object
    position - how many milliseconds into the sound the duck should 
        begin (this is where overlaid audio could begin, the fade down
        will happen before this point)
    duration - how long should the sound stay quiet (milliseconds)
    gain - how much quieter should the sound get (in dB)
    fade_duration - how long sound the fades last (in milliseconds)
    """

    # this part is from the beginning until the end of the ducked section
    first_part = sound[:position+duration]
    first_part = first_part.fade(to_gain=gain, end=position, duration=fade_duration)

    # this part begins where the fade_up happens (will just fade in)
    second_part = sound[position+duration:]
    second_part = second_part.fade(from_gain=gain, start=0, duration=fade_duration)

    return first_part + second_part


for timing, phrase in phrases.items():
    fileToAdd = pydub.AudioSegment.from_file(rep+"/"+str(timing)+".wav")

    finalFile = duck(finalFile, position=timing*1000, duration=len(fileToAdd))

    finalFile = finalFile.overlay(fileToAdd, position=timing*1000) 

经过一些测试，35分贝可能比你想要的要多。15分贝听起来不错:)