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我有一些代码：

  1. 使用 pyqt5 AudioInput 从麦克风录制

  2. 使用 pydub AudioSegment 写入文件 record.mp3。

  3. 使用以下代码预览 record.mp3：

    def preview_record(self,ui): filename = self.record_path #filename = filename.replace(" ","+") url = QtCore.QUrl.fromLocalFile(r""+filename) content = QtMultimedia.QMediaContent(url) self.player = QtMultimedia.QMediaPlayer() self.player.setMedia(content) self.player.play()

问题是，如果我预览录制的文件，然后录制一个新文件，那么在第 2 步）：

PermissionError: [Errno 13] Permission denied: '../disket box/weather news/record.mp3'

这是因为资源已打开以供预览。我怎样才能释放资源来解决问题？

编辑：重现问题的示例：

from PyQt5 import QtCore, QtGui, QtWidgets, QtMultimedia
from PyQt5.QtCore import QDate, QTime,QTimer, QDateTime, Qt
from pydub import AudioSegment
from datetime import datetime
import vlc
import ctypes
import os
from pathlib import Path
import shutil
from PyQt5 import QtCore, QtGui, QtWidgets, QtMultimedia
import time
import moviepy.editor
import moviepy.video.fx.all as vfx
from pydub import AudioSegment

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(400, 300)
        self.record = QtWidgets.QPushButton(Form)
        self.record.setGeometry(QtCore.QRect(110, 30, 161, 61))
        self.record.setObjectName("record")
        self.stop = QtWidgets.QPushButton(Form)
        self.stop.setGeometry(QtCore.QRect(110, 140, 161, 61))
        self.stop.setObjectName("stop")
        self.preview = QtWidgets.QPushButton(Form)
        self.preview.setGeometry(QtCore.QRect(120, 250, 151, 81))
        self.preview.setObjectName("preview")

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)
        
        self.destinationFile = QtCore.QFile()
        
        self.record.clicked.connect(lambda state:self.start_recording())
        self.stop.clicked.connect(lambda state:self.stop_recording())
        self.preview.clicked.connect(lambda state:self.preview_record())

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "StackOverflow example"))
        self.record.setText(_translate("Form", "Record"))
        self.stop.setText(_translate("Form", "Stop"))
        self.preview.setText(_translate("Form", "Preview"))
        
    def start_recording(self):
        self.destinationFile.setFileName("record.raw")
        self.destinationFile.open( QtCore.QIODevice.ReadWrite | QtCore.QIODevice.Truncate )
        
        info = QtMultimedia.QAudioDeviceInfo.defaultInputDevice()

        format = QtMultimedia.QAudioFormat()
        format.setSampleRate(44100);
        format.setChannelCount(1);
        format.setSampleSize(16);
        format.setCodec("audio/pcm");
        format.setByteOrder(QtMultimedia.QAudioFormat.LittleEndian)
        format.setSampleType(QtMultimedia.QAudioFormat.SignedInt)

        
        
        input_devices = QtMultimedia.QAudioDeviceInfo.availableDevices(QtMultimedia.QAudio.AudioInput)
        
        if (info.isFormatSupported(format) is not True):
            format = info.nearestFormat(format)
            print("format changed")

        self.audio = QtMultimedia.QAudioInput(input_devices[0],format)
        self.audio.start(self.destinationFile)
    
    def stop_recording(self):
        self.audio.stop()
        self.destinationFile.close()
        raw_audio = AudioSegment.from_file("record.raw", format="raw",frame_rate=44100, channels=1, sample_width=2)
        raw_audio.export("record.mp3", format="mp3")

        
        self.record_path = os.path.abspath("record.mp3")
        
    def preview_record(self):
        filename = self.record_path
        url = QtCore.QUrl.fromLocalFile(r""+filename)
        content = QtMultimedia.QMediaContent(url)
        self.player = QtMultimedia.QMediaPlayer()
        self.player.setMedia(content)
        self.player.play()


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    app.addLibraryPath(r"C:/Users/Χρήστος/AppData/Local/Programs/Python/Python38/lib/site-packages/PyQt5/Qt/plugins")
    Form = QtWidgets.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    Form.showMaximized()
    sys.exit(app.exec_())

要重现它，请按照以下步骤操作：

  1. 按录制按钮开始录制
  2. 按停止按钮停止录制
  3. 按预览按钮预览录制（并等待预览完成）
  4. 再次按下记录按钮以获取新记录
  5. 按停止按钮停止新录制

错误是：

Traceback (most recent call last):
  File "stack_record.py", line 36, in <lambda>
    self.stop.clicked.connect(lambda state:self.stop_recording())
  File "stack_record.py", line 75, in stop_recording
    raw_audio.export("record.mp3", format="mp3")
  File "C:\Users\╫±▐≤ΪΎ≥\AppData\Local\Programs\Python\Python38\lib\site-packages\pydub\audio_segment.py", line 809, in export
    out_f, _ = _fd_or_path_or_tempfile(out_f, 'wb+')
  File "C:\Users\╫±▐≤ΪΎ≥\AppData\Local\Programs\Python\Python38\lib\site-packages\pydub\utils.py", line 60, in _fd_or_path_or_tempfile
    fd = open(fd, mode=mode)
PermissionError: [Errno 13] Permission denied: 'record.mp3'
4

1 回答 1

0
  1. 我使用 self.player 的 stateChanged 信号

self.player.stateChanged.connect(lambda state:self.mediastate_changed(state,ui))

  1. 预览完成后，我删除 self.player 实例

def mediastate_changed(self, state,ui): if self.player.state() != QtMultimedia.QMediaPlayer.PlayingState: del self.player

于 2020-10-13T05:27:47.113 回答