在记录未知长度的数据时如何修复误差

Question

我正在尝试从所需持续时间的麦克风中记录音频。我想通过获取用户输入来控制文件的持续时间。基于其决定，我必须停止记录并保存该持续时间的文件。

import pyaudio
import wave
from multiprocessing import Process
global flag
global frames
def try_recording(stream,RATE, CHUNK):
    while flag != 1:
        #for i in range(0,int(RATE/CHUNK*DURATION): 
        for i in range(0,int(RATE/CHUNK)):
            data = stream.read(CHUNK)
            frames.append(data)
def scan_input():
    num = input('Enter input number: ')
    if int(num) == 1:
       flag = 1
    else:
       scan_input()
if __name__=='__main__':
    FORMAT = pyaudio.paInt16
    CHANNELS = 2
    RATE = 44100
    CHUNK = 1024
    WAVE_OUTPUT_FILENAME = "file.wav"
    flag = 0
    audio = pyaudio.PyAudio()
    # start Recording
    stream = audio.open(format=FORMAT, channels=CHANNELS,
                    rate=RATE, input=True,
                    frames_per_buffer=CHUNK)
    print("recording...")
    frames = []
    #sys.setrecursionlimit(1500)
    p1 = Process(target=try_recording, args = (stream,RATE,CHUNK))
    p1.start()
    p2 = Process(target=scan_input)
    p2.start()
    #frames = try_recording(stream, RATE, CHUNK)
    print('finished recording')
    # stop Recording
    stream.stop_stream()
    stream.close()
    audio.terminate()
    waveFile = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
    waveFile.setnchannels(CHANNELS)
    waveFile.setsampwidth(audio.get_sample_size(FORMAT))
    waveFile.setframerate(RATE)
    waveFile.writeframes(b''.join(frames))
    waveFile.close()

当我在几秒钟内定义时间时，我能够记录文件。现在，我想在停止录制时扫描用户端的输入。因此，我通过添加并行处理来修改程序，以使两个函数同时运行。当我遇到递归错误时，我尝试通过添加sys.setrecursionlimit(1500)来解决它，但结果不会改变任何内容。

如何解决问题，以便我可以在所需的持续时间内记录音频。

更新：错误和追溯

recording...
Traceback (most recent call last):
  File "D:/Projects/Trails/try.py", line 14, in try_recording
try_recording(stream,RATE,CHUNK)
  File "D:/Projects/Trails/try.py", line 14, in try_recording
try_recording(stream,RATE,CHUNK)
  File "D:/Projects/Trails/try.py", line 14, in try_recording
try_recording(stream,RATE,CHUNK)
  [Previous line repeated 995 more times]
  File "D:/Projects/Trails/try.py", line 9, in try_recording
     if flag == 1:
  RecursionError: maximum recursion depth exceeded in comparison

如果我将限制增加到44000 sys.setrecursionlimit(44000)代码运行约1秒，以错误

结束

 Process finished with exit code -1073741571 (0xC00000FD)

update2： @Quamrana建议的更新代码。

这两个过程无法同时工作。循环不在过程2功能之外。使用打印语句的测试我知道，直到我按1循环1在过程1中循环，后来它将移至第二个过程，但无法从第一个功能扫描输入以结束录制。

更新3：更新过程参数

Traceback (most recent call last):
File "D:/Projects/Trails/try.py", line 42, in <module>
p1.start()
File "C:Program FilesPython36libmultiprocessingprocess.py", line 105, in start
self._popen = self._Popen(self)
File "C:Program FilesPython36libmultiprocessingcontext.py", line 223, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
File "C:Program FilesPython36libmultiprocessingcontext.py", line 322, in _Popen
return Popen(process_obj)
File "C:Program FilesPython36libmultiprocessingpopen_spawn_win32.py", line 65, in __init__
reduction.dump(process_obj, to_child)
File "C:Program FilesPython36libmultiprocessingreduction.py", line 60, in dump
ForkingPickler(file, protocol).dump(obj)
TypeError: can't pickle _portaudio.Stream objects
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "C:Program FilesPython36libmultiprocessingspawn.py", line 105, in spawn_main
exitcode = _main(fd)
File "C:Program FilesPython36libmultiprocessingspawn.py", line 115, in _main
self = reduction.pickle.load(from_parent)
EOFError: Ran out of input

如何解决多处理泡菜错误？

Answer 1

我认为您实际上不需要try_recording是递归的，因此可以像这样重写：

def try_recording(stream,RATE, CHUNK):
    while flag != 1:
        for i in range(0,int(RATE/CHUNK)):
            data = stream.read(CHUNK)
            frames.append(data)

您也无法正确启动流程。他们应该是：

p1 = Process(target=try_recording, args=(stream,RATE,CHUNK))
p2 = Process(target=scan_input)

，您的标志应该是共享变量：

# flag = 0
flag = multiprocessing.Value('i', 0)

Answer 2

try_recording进入else，您期望如何更新flag。您在此处实施了任何IPC机制。导致它进入无限环