Python vlc在播放后删除文件时不起作用

Question

我正在尝试使用PyQt5创建语音应用程序的文本，其中我正在使用gTTS模块将文本转换为语音。该API不播放语音，而是以.mp3或.wav格式保存。因此，保存后，我将使用VLC Player播放音频，因为它不会像Playsound或其他模块那样冻结应用程序。但是在播放音频后，我想删除该音频文件。为此，我正在使用os.remove()。如果我没有删除文件，则VLC Player会播放文件，但是当我尝试在播放音频后删除文件时，VLC Player无法找到该文件。我不想在播放音频时冻结程序。

import os
from gtts import gTTS
from datetime import datetime
from vlc import MediaPlayer

def convert_text(text):
       lang='fr'
       tts = gTTS(text=text, lang=lang)
       now = datetime.now()
       file_name = "sample_" + now.strftime("%b-%d-%Y-%H%M%S")+".mp3"
       tts.save(file_name)
       pl = MediaPlayer(file_name)
       pl.play()
       os.remove(file_name)
       return tts, file_name


if __name__ == '__main__':
       text = "Bonjour je m'appelle Antoine et j'habite à Montréal au Québec. Ce soir je serai à " \
              "la maison et je pourrai enfin voir mes enfants."
       convert_text(text)

错误

/home/garud/anaconda3/bin/python    
/home/garud/Documents/SpeechRecog/SpeechRecognition_v2/text2speech.py   
[00007fc2940076d0] filesystem stream error: cannot open file /home/garud/Documents/SpeechRecog/SpeechRecognition_v2/sample_Mar-14-2020-113837.mp3 (No such file or directory)   
[00005583b470a8e0] main input error: Your input can't be opened   
[00005583b470a8e0] main input error: VLC is unable to open the MRL 'file:///home/garud/Documents/SpeechRecog/SpeechRecognition_v2/sample_Mar-14-2020-113837.mp3'. Check the log for details.    
 Process finished with exit code 0

Answer 1

问题在于，vlc不会一点一点地读取整个文件，因此，如果仅在文件开始播放时将其删除，则它将失败。解决方案是在播放结束时删除文件，并指出要使用PyQt5，然后可以使用QTimer连续检查播放器的状态。

from datetime import datetime
import os
import sys
import threading

from gtts import gTTS
from vlc import MediaPlayer

from PyQt5 import QtCore, QtWidgets

CURRENT_DIR = os.path.dirname(os.path.realpath(__file__))


class ConverterWorker(QtCore.QObject):
    finished = QtCore.pyqtSignal(str)

    def convert(self, text, lang):
        threading.Thread(target=self._convert, args=(text, lang), daemon=True).start()

    def _convert(self, text, lang):
        tts = gTTS(text=text, lang=lang)
        now = datetime.now()
        file_name = "sample_{}.mp3".format(now.strftime("%b-%d-%Y-%H%M%S"))
        path = os.path.join(CURRENT_DIR, file_name)
        tts.save(path)
        self.finished.emit(path)


class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.converter = ConverterWorker()
        self.player = MediaPlayer()
        self.timer = QtCore.QTimer(interval=100, timeout=self.on_timeout)
        self.path = ""

        self.lineedit = QtWidgets.QLineEdit()
        self.button = QtWidgets.QPushButton(self.tr("Start"))

        lay = QtWidgets.QHBoxLayout(self)
        lay.addWidget(self.lineedit)
        lay.addWidget(self.button)

        self.button.clicked.connect(self.on_clicked)
        self.converter.finished.connect(self.on_finished)

        text = (
            "Bonjour je m'appelle Antoine et j'habite à Montréal au Québec. Ce soir je serai à "
            "la maison et je pourrai enfin voir mes enfants."
        )

        self.lineedit.setText(text)

    @QtCore.pyqtSlot()
    def on_clicked(self):
        self.converter.convert(self.lineedit.text(), "fr")
        self.button.setEnabled(False)

    @QtCore.pyqtSlot(str)
    def on_finished(self, path):
        self.path = path
        media = self.player.get_instance().media_new(path)
        self.player.set_media(media)
        self.player.play()
        self.timer.start()

    @QtCore.pyqtSlot()
    def on_timeout(self):
        if not self.player.is_playing():
            self.timer.stop()
            self.button.setEnabled(True)
            if os.path.isfile(self.path):
                os.remove(self.path)
                self.path = ""


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    w = Widget()
    w.resize(640, 60)
    w.show()
    sys.exit(app.exec_())