Pyaudio 录音数小时

Question

我正在尝试一次为我的麦克风录音多个 (~12) 小时。当我尝试关闭流时出现结构错误，但它只会在长时间录制后发生。

这是我的代码：

import pyaudio
import wave

import sys

import keyboard


if __name__ == '__main__':
    print('recording')

    CHUNK = 1024
    FORMAT = pyaudio.paInt16
    CHANNELS = 2
    RATE = 44100
    RECORD_SECONDS = 5
    WAVE_OUTPUT_FILENAME = "raw_radio.wav"

    p = pyaudio.PyAudio()

    stream = p.open(format=FORMAT,
                    channels=CHANNELS,
                    rate=RATE,
                    input=True,
                    frames_per_buffer=CHUNK)

    frames = []

    flag = False
    try:
        while(not flag and sys.getsizeof(frames) < sys.maxsize * .8):
            for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
                try:
                    data = stream.read(CHUNK)
                    frames.append(data)
                except Exception as e:
                    print(e)
                    flag=True
    except KeyboardInterrupt:
        print('ended recording, now saving')
        pass

    stream.stop_stream()
    stream.close()
    p.terminate()

    wf = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
    wf.setnchannels(CHANNELS)
    wf.setsampwidth(p.get_sample_size(FORMAT))
    wf.setframerate(RATE)
    wf.writeframes(b''.join(frames))
    wf.close()

这是标准输出：

recording
ended recording, now saving
Traceback (most recent call last):
  File ".\record_mic.py", line 54, in <module>
    wf.writeframes(b''.join(frames))
  File "C:\Users\Ben\AppData\Local\Programs\Python\Python36\lib\wave.py", line 427, in writeframes
    self.writeframesraw(data)
  File "C:\Users\Ben\AppData\Local\Programs\Python\Python36\lib\wave.py", line 416, in writeframesraw
    self._ensure_header_written(len(data))
  File "C:\Users\Ben\AppData\Local\Programs\Python\Python36\lib\wave.py", line 457, in _ensure_header_written
    self._write_header(datasize)
  File "C:\Users\Ben\AppData\Local\Programs\Python\Python36\lib\wave.py", line 474, in _write_header
    self._sampwidth * 8, b'data'))
struct.error: argument out of range
Exception ignored in: <bound method Wave_write.__del__ of <wave.Wave_write object at 0x000001CA028A5FD0>>
Traceback (most recent call last):
  File "C:\Users\Ben\AppData\Local\Programs\Python\Python36\lib\wave.py", line 316, in __del__
  File "C:\Users\Ben\AppData\Local\Programs\Python\Python36\lib\wave.py", line 434, in close
  File "C:\Users\Ben\AppData\Local\Programs\Python\Python36\lib\wave.py", line 457, in _ensure_header_written
  File "C:\Users\Ben\AppData\Local\Programs\Python\Python36\lib\wave.py", line 474, in _write_header
struct.error: argument out of range

我在想，因为我必须按两次 Ctrl+C 才能引发 KeyboardInput 错误，所以我正在做一些错误编辑帧列表的事情。

Answer 1

您正在尝试编写一个波形文件，该文件的长度超过波形格式在一个 WAVE 块中所能表示的长度。

（我不确定是否允许 RIFF 文件包含多个 WAVE 块，也不确定是否允许支持具有多个 WAVE 块的 RIFF 文件。但是 wave 模块可以读取它们。它只是可以'不写了。如果是这样的话，wave文件的长度就没有实际限制了。)

您正在尝试立即写入 2*44100*2*(12*3600)==7620480000 或 7.3GB。

发生异常的代码为：

        self._file.write(struct.pack('<L4s4sLHHLLHH4s',
            36 + self._datalength, b'WAVE', b'fmt ', 16,
            WAVE_FORMAT_PCM, self._nchannels, self._framerate,
            self._nchannels * self._framerate * self._sampwidth,
            self._nchannels * self._sampwidth,
            self._sampwidth * 8, b'data'))

这将写入 wave 块 header。第一个 L 是数据的长度加上 header，它将数据限制为 4294967259 字节。这是 4GB - 36 字节

将文件分块写入以分隔文件。

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