How to use QFile with Python VLC MediaPlayer

You need to use vlc.media_new_callbacks for this so that you can wrap the QFile and use its methods. Below is a demo script that shows how to implement that:

import sys, vlc from PyQt5.QtCore import QFile, QCoreApplication @vlc.CallbackDecorators.MediaOpenCb def open_cb(opaque, data, size): data.contents.value = opaque size.value = sys.maxsize return 0 @vlc.CallbackDecorators.MediaReadCb def read_cb(opaque, buffer, length): data = qfile.read(length) for index, char in enumerate(data): buffer[index] = char return len(data) @vlc.CallbackDecorators.MediaSeekCb def seek_cb(opaque, offset): qfile.seek(offset) return 0 @vlc.CallbackDecorators.MediaCloseCb def close_cb(opaque): qfile.close() if __name__ == '__main__': import time, signal signal.signal(signal.SIGINT, signal.SIG_DFL) print('Press Ctrl+C to Quit') player = vlc.Instance().media_player_new() qfile = QFile(sys.argv[1]) qfile.open(QFile.ReadOnly) player.set_media(vlc.Instance().media_new_callbacks( open_cb, read_cb, seek_cb, close_cb, None)) player.play() app = QCoreApplication(sys.argv) app.exec_() 

UPDATE:

It's somewhat tricky to get this working correctly in a more typical PyQt application, because the callbacks have to be static functions. Here is an extended example that shows how it can be done:

import sys, ctypes, vlc from PyQt5 import QtCore, QtWidgets class VLCPlayer(QtCore.QObject): def __init__(self, parent=None): super().__init__() self._player = vlc.Instance().media_player_new() @staticmethod @vlc.CallbackDecorators.MediaOpenCb def _open_cb(voidptr, data, size): data.contents.value = voidptr size.value = sys.maxsize return 0 @staticmethod @vlc.CallbackDecorators.MediaReadCb def _read_cb(voidptr, buffer, length): stream = ctypes.cast( voidptr, ctypes.POINTER(ctypes.py_object)).contents.value data = stream.read(length) for index, char in enumerate(data): buffer[index] = char return len(data) @staticmethod @vlc.CallbackDecorators.MediaSeekCb def _seek_cb(voidptr, offset): stream = ctypes.cast( voidptr, ctypes.POINTER(ctypes.py_object)).contents.value stream.seek(offset) return 0 @staticmethod @vlc.CallbackDecorators.MediaCloseCb def _close_cb(voidptr): stream = ctypes.cast( voidptr, ctypes.POINTER(ctypes.py_object)).contents.value stream.close() def play(self): self._player.play() def stop(self): self._player.stop() def load(self, path): file = QtCore.QFile(path) file.open(QtCore.QIODevice.ReadOnly) voidptr = ctypes.cast(ctypes.pointer( ctypes.py_object(file)), ctypes.c_void_p) self._player.set_media(vlc.Instance().media_new_callbacks( self._open_cb, self._read_cb, self._seek_cb, self._close_cb, voidptr)) class Window(QtWidgets.QWidget): def __init__(self): super().__init__() self.buttonPlay = QtWidgets.QPushButton('Play') self.buttonPlay.clicked.connect(self.handlePlay) self.buttonStop = QtWidgets.QPushButton('Stop') self.buttonStop.clicked.connect(self.handleStop) self.buttonOpen = QtWidgets.QPushButton('Open') self.buttonOpen.clicked.connect(self.handleOpen) layout = QtWidgets.QHBoxLayout(self) layout.addWidget(self.buttonOpen) layout.addWidget(self.buttonPlay) layout.addWidget(self.buttonStop) self.player = VLCPlayer(self) def handlePlay(self): self.player.play() def handleStop(self): self.player.stop() def handleOpen(self): path, ok = QtWidgets.QFileDialog.getOpenFileName( self, filter='Audio Files (*.wav)') if ok: self.player.load(path) if __name__ == '__main__': app = QtWidgets.QApplication(sys.argv) window = Window() window.setWindowTitle('VLC Player') window.setGeometry(600, 100, 200, 80) window.show() sys.exit(app.exec_())