我正在尝试播放媒体文件。这是python-vlc存储库上的示例：
import platform
import os
import sys
from PyQt5 import QtWidgets, QtGui, QtCore
import vlc
class Player(QtWidgets.QMainWindow):
"""A simple Media Player using VLC and Qt
"""
def __init__(self, master=None):
QtWidgets.QMainWindow.__init__(self, master)
self.setWindowTitle("Media Player")
# Create a basic vlc instance
self.instance = vlc.Instance()
self.media = None
# Create an empty vlc media player
self.mediaplayer = self.instance.media_player_new()
self.create_ui()
self.is_paused = False
def create_ui(self):
"""Set up the user interface, signals & slots
"""
self.widget = QtWidgets.QWidget(self)
self.setCentralWidget(self.widget)
# In this widget, the video will be drawn
if platform.system() == "Darwin": # for MacOS
self.videoframe = QtWidgets.QMacCocoaViewContainer(0)
else:
self.videoframe = QtWidgets.QFrame()
self.palette = self.videoframe.palette()
self.palette.setColor(QtGui.QPalette.Window, QtGui.QColor(0, 0, 0))
self.videoframe.setPalette(self.palette)
self.videoframe.setAutoFillBackground(True)
self.positionslider = QtWidgets.QSlider(QtCore.Qt.Horizontal, self)
self.positionslider.setToolTip("Position")
self.positionslider.setMaximum(1000)
self.positionslider.sliderMoved.connect(self.set_position)
self.positionslider.sliderPressed.connect(self.set_position)
self.hbuttonbox = QtWidgets.QHBoxLayout()
self.playbutton = QtWidgets.QPushButton("Play")
self.hbuttonbox.addWidget(self.playbutton)
self.playbutton.clicked.connect(self.play_pause)
self.stopbutton = QtWidgets.QPushButton("Stop")
self.hbuttonbox.addWidget(self.stopbutton)
self.stopbutton.clicked.connect(self.stop)
self.hbuttonbox.addStretch(1)
self.volumeslider = QtWidgets.QSlider(QtCore.Qt.Horizontal, self)
self.volumeslider.setMaximum(100)
self.volumeslider.setValue(self.mediaplayer.audio_get_volume())
self.volumeslider.setToolTip("Volume")
self.hbuttonbox.addWidget(self.volumeslider)
self.volumeslider.valueChanged.connect(self.set_volume)
self.vboxlayout = QtWidgets.QVBoxLayout()
self.vboxlayout.addWidget(self.videoframe)
self.vboxlayout.addWidget(self.positionslider)
self.vboxlayout.addLayout(self.hbuttonbox)
self.widget.setLayout(self.vboxlayout)
menu_bar = self.menuBar()
# File menu
file_menu = menu_bar.addMenu("File")
# Add actions to file menu
open_action = QtWidgets.QAction("Load Video", self)
close_action = QtWidgets.QAction("Close App", self)
file_menu.addAction(open_action)
file_menu.addAction(close_action)
open_action.triggered.connect(self.open_file)
close_action.triggered.connect(sys.exit)
self.timer = QtCore.QTimer(self)
self.timer.setInterval(100)
self.timer.timeout.connect(self.update_ui)
def play_pause(self):
"""Toggle play/pause status
"""
if self.mediaplayer.is_playing():
self.mediaplayer.pause()
self.playbutton.setText("Play")
self.is_paused = True
self.timer.stop()
else:
if self.mediaplayer.play() == -1:
self.open_file()
return
self.mediaplayer.play()
self.playbutton.setText("Pause")
self.timer.start()
self.is_paused = False
def stop(self):
"""Stop player
"""
self.mediaplayer.stop()
self.playbutton.setText("Play")
def open_file(self):
"""Open a media file in a MediaPlayer
"""
dialog_txt = "Choose Media File"
filename = QtWidgets.QFileDialog.getOpenFileName(self, dialog_txt, os.path.expanduser('~'))
if not filename:
return
# getOpenFileName returns a tuple, so use only the actual file name
self.media = self.instance.media_new(filename[0])
# Put the media in the media player
self.mediaplayer.set_media(self.media)
# Parse the metadata of the file
self.media.parse()
# Set the title of the track as window title
self.setWindowTitle(self.media.get_meta(0))
# The media player has to be 'connected' to the QFrame (otherwise the
# video would be displayed in it's own window). This is platform
# specific, so we must give the ID of the QFrame (or similar object) to
# vlc. Different platforms have different functions for this
if platform.system() == "Linux": # for Linux using the X Server
self.mediaplayer.set_xwindow(int(self.videoframe.winId()))
elif platform.system() == "Windows": # for Windows
self.mediaplayer.set_hwnd(int(self.videoframe.winId()))
elif platform.system() == "Darwin": # for MacOS
self.mediaplayer.set_nsobject(int(self.videoframe.winId()))
self.play_pause()
def set_volume(self, volume):
"""Set the volume
"""
self.mediaplayer.audio_set_volume(volume)
def set_position(self):
"""Set the movie position according to the position slider.
"""
# The vlc MediaPlayer needs a float value between 0 and 1, Qt uses
# integer variables, so you need a factor; the higher the factor, the
# more precise are the results (1000 should suffice).
# Set the media position to where the slider was dragged
self.timer.stop()
pos = self.positionslider.value()
self.mediaplayer.set_position(pos / 1000.0)
self.timer.start()
def update_ui(self):
"""Updates the user interface"""
# Set the slider's position to its corresponding media position
# Note that the setValue function only takes values of type int,
# so we must first convert the corresponding media position.
media_pos = int(self.mediaplayer.get_position() * 1000)
self.positionslider.setValue(media_pos)
# No need to call this function if nothing is played
if not self.mediaplayer.is_playing():
self.timer.stop()
# After the video finished, the play button stills shows "Pause",
# which is not the desired behavior of a media player.
# This fixes that "bug".
if not self.is_paused:
self.stop()
def main():
"""Entry point for our simple vlc player
"""
app = QtWidgets.QApplication(sys.argv)
player = Player()
player.show()
player.resize(640, 480)
sys.exit(app.exec_())
if __name__ == "__main__":
main()
然而，当我从连接了USB的手机中选择一个文件时，我会收到这个警告。
libdvdread: Attempting to use device /dev/sda4 mounted on / for CSS authentication
libdvdread: Could not open input: Permission denied
libdvdread: Can't open /dev/sda4 for reading
libdvdread: Device /dev/sda4 inaccessible, CSS authentication not available.
libdvdread:DVDOpenFilePath:findDVDFile /VIDEO_TS/VIDEO_TS.IFO failed
libdvdread:DVDOpenFilePath:findDVDFile /VIDEO_TS/VIDEO_TS.BUP failed
libdvdread: Can't open file VIDEO_TS.IFO.
libdvdnav: vm: failed to read VIDEO_TS.IFO
我必须临时复制这些文件才能播放吗？或者还有别的办法吗？
如果设备是大容量存储，你不必复制，但对于没有类似功能的手机，我必须在播放之前复制文件。我用了shutil。当然是在主线程之外的线程中。
import shutil
copied_file = shutil.copyfile(src_filepath, dest_filepath)
self.media = self.instance.media_new(copied_file)