如何解决使用VLC和PyQt在Python中运行视频无法启动
我正在尝试通过VLC在PyQt中以帧形式播放视频，我在这里遵循了类似的问题，以获取要使用的示例代码：
class VideoPlayer(QMainWindow):
def __init__(self,parent,inputPath):
super(VideoPlayer,self).__init__(parent)
self.setWindowTitle("Media Player")
# creating a basic vlc instance
self.instance = vlc.Instance()
self.mediaplayer = self.instance.media_player_new()
##########video frame
self.videoframe = QFrame(
frameShape=QFrame.Box,frameShadow=QFrame.Raised
)
if sys.platform.startswith("linux"): # for Linux using the X Server
self.mediaplayer.set_xwindow(self.videoframe.winId())
elif sys.platform == "win32": # for Windows
self.mediaplayer.set_hwnd(self.videoframe.winId())
elif sys.platform == "darwin": # for MacOS
self.mediaplayer.set_nsobject(self.videoframe.winId())
central_widget = QWidget()
self.setCentralWidget(central_widget)
lay = QVBoxLayout(central_widget)
lay.addWidget(self.videoframe)
filename = inputPath
media = self.instance.media_new(filename)
self.mediaplayer.set_media(media)
self.mediaplayer.play()
尝试运行它只会在每次启动时给我这些错误：
[0c92dc18] mmdevice audio output error: cannot initialize COM (error 0x80010106)
[0ef89108] mmdevice audio output error: cannot initialize COM (error 0x80010106)
[0f07f308] direct3d11 vout display error: SetThumbNailClip failed: 0x800706f4
[0f07f308] direct3d9 vout display error: SetThumbNailClip failed: 0x800706f4
[0f07f308] glwin32 vout display error: Win32VoutCreateWindow RegisterClass FAILED (err=1410)
[0f07f308] glwin32 vout display error: SetThumbNailClip failed: 0x800706f4
[0efbc4b8] wgl gl error: Could not get the device context
[0f07f308] directdraw vout display error: Win32VoutCreateWindow RegisterClass FAILED (err=1410)
[0f07f308] directdraw vout display error: SetThumbNailClip failed: 0x800706f4
[0f07f308] wingdi vout display error: Win32VoutCreateWindow RegisterClass FAILED (err=1410)
[0f07f308] wingdi vout display error: SetThumbNailClip failed: 0x800706f4
[0f07c670] main video output error: video output creation failed
[0ef90360] main decoder error: failed to create video output
如果我在不使用PyQt的情况下运行视频，就像这样：
Instance = vlc.Instance()
player = Instance.media_player_new()
Media = Instance.media_new(inputPath)
player.set_media(Media)
player.play()
time.sleep(5) # Or however long you expect it to take to open vlc
while player.is_playing():
time.sleep(1)
if 0xFF == ord("q"):
player.stop()
player.stop()
工作正常。有人可以指出我在这里可能做错了什么吗？
解决方法
我尝试重新创建问题，并找到以下解决方案：
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))
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()
我使用的VLC版本是64位。这是输出：
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