我正在尝试同时运行 QVideoWidget 和 matplotlib 动画，
但是当我运行这个 py 时，QVideoWidget 不起作用。
我得到了 QVideoWidget 代码和 matplotlib 动画代码，然后将这些代码汇总在下面的代码中。
如果我关闭 matplotlib 动画窗口，则 QVideoWidget 正在工作。
我想知道为什么会发生这种情况并解决这个问题
谢谢
import matplotlib.pyplot as plt
import matplotlib.animation as animation
import random
from PyQt5.QtCore import QDir, Qt, QUrl
from PyQt5.QtMultimedia import QMediaContent, QMediaPlayer
from PyQt5.QtMultimediaWidgets import QVideoWidget
from PyQt5.QtWidgets import (QApplication, QFileDialog, QHBoxLayout, QLabel,
QPushButton, QSizePolicy, QSlider, QStyle, QVBoxLayout, QWidget)
from PyQt5.QtWidgets import QMainWindow,QWidget, QPushButton, QAction
from PyQt5.QtGui import QIcon
import sys
from PyQt5.QtWidgets import (QApplication, QCheckBox, QGridLayout, QGroupBox,
QMenu, QPushButton, QRadioButton, QVBoxLayout, QWidget)
# Parameters
x_len = 200 # Number of points to display
y_range = [10, 40] # Range of possible Y values to display
# Create figure for plotting
fig = plt.figure(facecolor='white')
ax = fig.add_subplot(2, 1, 1)
bx = fig.add_subplot(2, 1, 2)
xs = list(range(0, 200))
ys = [0] * x_len
ax.set_ylim(y_range)
bx.set_ylim(y_range)
# Initialize communication with TMP102
# When everything done, release the capture
# Create a blank line. We will update the line in animate
line, = ax.plot(xs, ys)
line2, = bx.plot(xs, ys)
# Add labels
plt.title('TMP102 Temperature over Time')
plt.xlabel('Samples')
plt.ylabel('Temperature (deg C)')
class VideoWindow(QMainWindow):
def __init__(self, parent=None):
super(VideoWindow, self).__init__(parent)
self.setWindowTitle("PyQt Video Player Widget Example - pythonprogramminglanguage.com")
self.mediaPlayer = QMediaPlayer(None, QMediaPlayer.VideoSurface)
videoWidget = QVideoWidget()
self.playButton = QPushButton()
self.playButton.setEnabled(False)
self.playButton.setIcon(self.style().standardIcon(QStyle.SP_MediaPlay))
self.playButton.clicked.connect(self.play)
self.positionSlider = QSlider(Qt.Horizontal)
self.positionSlider.setRange(0, 0)
self.positionSlider.sliderMoved.connect(self.setPosition)
self.errorLabel = QLabel()
self.errorLabel.setSizePolicy(QSizePolicy.Preferred,
QSizePolicy.Maximum)
# Create new action
openAction = QAction(QIcon('open.png'), '&Open', self)
openAction.setShortcut('Ctrl+O')
openAction.setStatusTip('Open movie')
openAction.triggered.connect(self.openFile)
# Create exit action
exitAction = QAction(QIcon('exit.png'), '&Exit', self)
exitAction.setShortcut('Ctrl+Q')
exitAction.setStatusTip('Exit application')
exitAction.triggered.connect(self.exitCall)
# Create menu bar and add action
menuBar = self.menuBar()
fileMenu = menuBar.addMenu('&File')
#fileMenu.addAction(newAction)
fileMenu.addAction(openAction)
fileMenu.addAction(exitAction)
# Create a widget for window contents
wid = QWidget(self)
self.setCentralWidget(wid)
# Create layouts to place inside widget
controlLayout = QHBoxLayout()
controlLayout.setContentsMargins(0, 0, 0, 0)
controlLayout.addWidget(self.playButton)
controlLayout.addWidget(self.positionSlider)
layout = QVBoxLayout()
layout.addWidget(videoWidget)
layout.addLayout(controlLayout)
layout.addWidget(self.errorLabel)
# Set widget to contain window contents
wid.setLayout(layout)
self.mediaPlayer.setVideoOutput(videoWidget)
self.mediaPlayer.stateChanged.connect(self.mediaStateChanged)
self.mediaPlayer.positionChanged.connect(self.positionChanged)
self.mediaPlayer.durationChanged.connect(self.durationChanged)
self.mediaPlayer.error.connect(self.handleError)
def openFile(self):
fileName, _ = QFileDialog.getOpenFileName(self, "Open Movie",
QDir.homePath())
if fileName != '':
self.mediaPlayer.setMedia(
QMediaContent(QUrl.fromLocalFile(fileName)))
self.playButton.setEnabled(True)
def exitCall(self):
sys.exit(app.exec_())
def play(self):
if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
self.mediaPlayer.pause()
else:
self.mediaPlayer.play()
def mediaStateChanged(self, state):
if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
self.playButton.setIcon(
self.style().standardIcon(QStyle.SP_MediaPause))
else:
self.playButton.setIcon(
self.style().standardIcon(QStyle.SP_MediaPlay))
def positionChanged(self, position):
self.positionSlider.setValue(position)
def durationChanged(self, duration):
self.positionSlider.setRange(0, duration)
def setPosition(self, position):
self.mediaPlayer.setPosition(position)
def handleError(self):
self.playButton.setEnabled(False)
self.errorLabel.setText("Error: " + self.mediaPlayer.errorString())
def animate(i, ys):
# Read temperature (Celsius) from TMP102
temp_c = random.randint(15, 35)
# Add y to list
ys.append(temp_c)
# Limit y list to set number of items
ys = ys[-x_len:]
# Update line with new Y values
line.set_ydata(ys)
line2.set_ydata(ys)
return line, line2,
ani = animation.FuncAnimation(fig, animate, fargs=(ys,),
interval=50,
blit=True)
# This function is called periodically from FuncAnimation
# Set up plot to call animate() function periodically
if __name__ == '__main__':
app = QApplication(sys.argv)
player = VideoWindow()
player.resize(640, 480)
player.show()
plt.show()
sys.exit(app.exec_())