linux下使用pyqt5的QMediaPlayer制作简易播放器（存在进度条、前进、后退、暂停、打开、播放等操作）

1. 问题

关于pyqt5的qmediaplayer模块制作简易播放器，网上很多博客都是win下的，放在linux系统会出问题；另外，部分博客缺少文件，无法直接使用。

参考博客《基于pyqt5的QMediaPlayer实现视频播放器（拨动进度条，音量，更换播放模式，加入多个播放文件）》、《《快速掌握PyQt5》第三十三章 音频与视频》、《PyQt5 实现视频播放器》

下面给出可直接使用的简易播放器源码。

2. 解决

在linux（我使用的是ubuntu 18.04）上，除了正常conda安装pyqt5之外，为了正常使用qmediaplayer，还需要安装multimedia组块

sudo apt install libqt5multimedia*   qtmultimedia5-*
sudo apt-get install ubuntu-restricted-extras

直接上源码，如下

# coding=gb2312
# 基于pyqt5
import os
import sys

#from PyQt5.QtCore import QDateTime, QUrl
from PyQt5.QtMultimedia import QAudioOutput, QMediaPlayer, QMediaContent, QMediaPlaylist
from PyQt5.QtMultimediaWidgets import QVideoWidget
#from PyQt5.QtWidgets import QMainWindow, QFileDialog, QApplication, QSlider
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

#from mediawin_qt5 import Ui_MainWindow


class Video_win(QWidget):
    def __init__(self):
        super(Video_win, self).__init__()
        self.setWindowTitle("简易播放器")
        self.resize(800, 600)
        # 播放画面
        self.player = QMediaPlayer()
        self.videoout =  QVideoWidget(self)                       # 定义视频显示的widget
        self.videoout.resize(self.width(), self.height())
        self.player.setVideoOutput(self.videoout) # 视频播放输出的widget，就是上面定义的
        
        # 当前播放的进度，显示调整视频进度条
        self.timeSlider = QSlider(self)
        self.timeSlider.setOrientation(Qt.Horizontal)
        self.timeSlider.setValue(0)
        self.timeSlider.setMinimum(0)
        self.player.positionChanged.connect(self.get_time)
        self.timeSlider.sliderPressed.connect(self.player.pause)
        self.timeSlider.sliderMoved.connect(self.change_time)
        self.timeSlider.sliderReleased.connect(self.player.play)

        # 打开视频
        self.open_button = QPushButton('打开')
        self.open_button.clicked.connect(self.open_file) 
        # 快进
        self.right_button = QPushButton('快进')
        self.right_button.clicked.connect(self.up_time)
        # play
        self.play_button = QPushButton('播放')
        self.play_button.clicked.connect(self.player.play)
        # pause
        self.mid_button = QPushButton('暂停')
        self.mid_button.clicked.connect(self.player.pause)
        # 快退
        self.left_button = QPushButton('快退')
        self.left_button.clicked.connect(self.down_time)
        # 上述按钮布局
        button_layout = QHBoxLayout()
        button_layout.addWidget(self.open_button)
        button_layout.addWidget(self.right_button)
        button_layout.addWidget(self.play_button)
        button_layout.addWidget(self.mid_button)
        button_layout.addWidget(self.left_button)
        
        # 总体布局
        all_layout = QVBoxLayout(self)
        all_layout.addWidget(self.videoout)
        all_layout.addWidget(self.timeSlider)
        all_layout.addLayout(button_layout)
        self.setLayout(all_layout)
        
    
    # 打开视频
    def open_file(self):
        self.player.setMedia(QMediaContent(QFileDialog.getOpenFileUrl()[0]))  # 选取视频文件
        msg = QMessageBox.information(self, '提示', "已经打开视频文件")
        
    
    # 调节播放进度
    def change_time(self, num):
        self.player.setPosition(num)

    # 快进
    def up_time(self):
        num = self.player.position() + int(self.player.duration() / 20)
        self.player.setPosition(num)
    
    # 快退
    def down_time(self):
        num = self.player.position() - int(self.player.duration() / 20)
        self.player.setPosition(num)

    # 获取获得进度条进度
    def get_time(self, num):
        self.timeSlider.setMaximum(self.player.duration())
        self.timeSlider.setValue(num)
        d = QDateTime.fromMSecsSinceEpoch(num).toString("mm:ss")
        all = self.player.duration()
        all_d = QDateTime.fromMSecsSinceEpoch(all).toString("mm:ss")
        
    def closeEvent(self, event): # 关闭前需要self.player.pause()操作，否则报错
        self.player.pause() 
        reply = QMessageBox.question(self, '提示',
                    "是否退出",
                    QMessageBox.Yes | QMessageBox.No,
                    QMessageBox.No)
        if reply == QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()



if __name__ == '__main__':
    app = QApplication(sys.argv)
    app.aboutToQuit.connect(app.deleteLater)
    win = Video_win()
    win.show()
    sys.exit(app.exec())

3. 效果