无法正确增加变量并将 .wav 转换为 .mp3

Question

我正在尝试创建一个新的文件记录，每次此程序 运行s 并将这些 .wav 文件转换为 .mp3。当我 运行 这个时，它只会创建一个 output.wav 和 output0.mp3 文件，然后当我再次 运行 它时，不会创建更多文件。还有转换出来的output0.mp3是0KB，不能播放

我没有收到错误，但它似乎没有正确获取最初创建的 output.wav。我是运行宁Python3.7.

import os
import sounddevice as sd
from scipy.io.wavfile import write
from pydub import AudioSegment #for converting WAV to MP3


fs = 44100  # Sample rate
seconds = 3  # Duration of recording

myrecording = sd.rec(int(seconds * fs), samplerate=fs, channels=2)
sd.wait()  # Wait until recording is finished
write('output.wav', fs, myrecording )  # Save as WAV file


#Increments file name by 1 so it writes a new file every time it runs
i = 0
while os.path.exists("output%s.wav" % i):
    i += 1

    # files for converting WAV to Mp3
    src = ("output%s.wav" % i)
    dst = ("output%s.mp3" % i)

    # convert wav to mp3
    sound = AudioSegment.from_mp3(src)
    sound.export(dst, format="wav")

writefile = open("output%s.mp3" % i, "w")

编辑：

已将 while 循环更新为：

#Increments file name by 1 so it writes a new file every time it runs
i = 0
while os.path.exists("output%s.wav" % i):

    # files for converting WAV to Mp3
    src = ("output%s.wav" % i)
    dst = ("output%s.mp3" % i)

    # convert wav to mp3
    sound = AudioSegment.from_mp3(src)
    sound.export(dst, format="wav")

    write("output%s.mp3" % i, "w")

    i += 1

Answer 1

“每次运行此程序时创建一个新文件记录” - 据我了解，您只需要检查现有文件并获得一个计数器以达到 +1 然后是最后一个文件。一旦你得到那个 create/convert 基于那个的文件。

声音模块的工作原理我不是很熟悉，不过大体上应该是下面的代码结构。

## This will create new recording file called output.wav

myrecording = sd.rec(int(seconds * fs), samplerate=fs, channels=2)
sd.wait()  # Wait until recording is finished
write('output.wav', fs, myrecording )  # Save as WAV file


# Get the counter to reach the last file that has been created.
# For e.g. if last file generated was output5.wav then below loop will run 5 times
# and should change the value of i = 6.
i = 0
while os.path.exists("output%s.wav" % i):
    i += 1

# Code for creating new file using value of 'i'
# Below code is outside of while loop and will run only once,
# as 1 file needs to be created per run of the program.

src = ("output.wav")
dst = ("output%s.mp3" % i)

# convert wav to mp3
sound = AudioSegment.from_mp3(src)
sound.export(dst, format="wav")

# Not sure if this is needed.
# Check working of sound module and what does sound.export do

writefile = open("output%s.mp3" % i, "w")

Answer 2

解决方案：更新了我的 while 循环并更改了转换方法

i = 0

while not os.path.exists("output.wav"):
    i += 1
    fs = 44100  # Sample rate
    seconds = 3  # Duration of recording

    myrecording = sd.rec(int(seconds * fs), samplerate=fs, channels=2)
    sd.wait()  # Wait until recording is finished
    write('output{0}.wav'.format(i), fs, myrecording )  # Save as WAV file
    print("recording has finished")

    datadir = str(Path(r"FilePathtoFolderWhereAudioFileIs"))
    filetopen = datadir + "/" + 'output{0}.wav'.format(i)

    sound = pydub.AudioSegment.from_wav(r"FilePathtoFolderWhereAudioFileIs""" + "\output{0}.wav".format(i))
    sound.export(r"FilePathtoFolderWhereAudioFileIs""" + "\output{0}.mp3".format(i), format="mp3")
    print("Converted wav to mp3")

    time.sleep(3)