python - Python:消除录制的音频片段之间的间隙

Question

我正在使用Python sounddevice库录制音频，但是似乎无法消除应该是连续音频文件之间的〜0.25到〜0.5秒间隔。我认为这是因为文件写入会占用时间，因此我学会了使用“多处理”和“队列”来区分文件写入，但并没有帮助。最令人困惑的是，日志表明Main()循环中的迭代接近无缝(只有1-5毫秒)，但是奇怪的是audio_capture函数花费的时间比预期的长，甚至没有其他重要的事情要做。我试图尽可能减少这篇文章的脚本。我的研究都针对这种线程/多处理方法，所以我感到困惑。
背景:Raspbian Buster上的3.7
我将数据分成多个部分，以使文件不会太大，并且我想编程任务必须应对这一挑战。之后，我还有其他4个子进程在做各种事情。
日志:audio_capture部分应该只需要10:00

08:26:29.991 --- Start of segment #0
08:36:30.627 --- End of segment #0     <<<<< This is >0.6 later than it should be
08:36:30.629 --- Start of segment #1   <<<<< This is near gapless with the prior event

脚本:

import logging
import sounddevice
from scipy.io.wavfile import write
import time
import os
from multiprocessing import Queue, Process

# this process is a near endless loop
def main():
    fileQueue = Queue()
    writerProcess = Process(target=writer, args=(fileQueue,))
    writerProcess.start()
    for i in range(9000):
        fileQueue.put(audio_capture(i)) 
    writerProcess.join()

# This func makes an audio data object from a sound source
def audio_capture(i): 
    cycleNumber = str(i)
    logging.debug('Start of segment #' + cycleNumber)
    # each cycle is 10 minutes at 32000Hz sample rate
    audio = sounddevice.rec(frames=600 * 32000, samplerate=32000, channels=2) 
    name = time.strftime("%H-%M-%S") + '.wav' 
    path = os.path.join('/audio', name)
    sounddevice.wait()
    logging.debug('End of segment #' + cycleNumber)
    return [audio, path]
    
# This function writes the files.
def writer(input_queue):
    while True:
        try:
            parameters = input_queue.get()
            audio = parameters[0]
            path = parameters[1]
            write(filename=path, rate=32000, data=audio)
            logging.debug('File is written')
        except:
            pass

if __name__ == "__main__":
    logging.basicConfig(level=logging.DEBUG, format='%(asctime)s.%(msecs)03d --- %(message)s', datefmt='%H:%M:%S',handlers=[logging.FileHandler('/audio/log.txt'), logging.StreamHandler()])
    main()  

Answer 1

documentation告诉我们sounddevice.rec()并非无间断的记录:

If you need more control (e.g. block-wise gapless recording, overlapping recordings, …), you should explicitly create an InputStream yourself. If NumPy is not available, you can use a RawInputStream.

example programs中有多个无缝记录示例。