基于Python和PyQt5实现读取本地视频后循环播放

# -*- coding: utf-8 -*- """ 基于Python实现播放本地视频文件 """ # -------------------------------------- 引入依赖模块 -------------------------------------------------------------------- import sys from PyQt5.QtGui import QIcon from PyQt5.QtWidgets import QApplication, QMainWindow, QFileDialog, QMessageBox from PyQt5 import QtGui, QtCore from yanshi import MainUi import cv2 global openFilepath, video_path openFilepath = '' video_path = '' class MainCode(QMainWindow, MainUi.Ui_MainWindow): # MainUi为qt designer生成的主界面设计文件的.py文件 def __init__(self): QMainWindow.__init__(self) MainUi.Ui_MainWindow.__init__(self) self.setupUi(self) self.status = self.statusBar() self.setWindowTitle('PythonGUI本地视频播放示例') self.setWindowIcon(QIcon('../images/tubiao.png')) # 设置窗体标题图标 self.timer_camera = QtCore.QTimer() # 定义定时器，用于控制显示视频的帧率 self.btn_openvideo.clicked.connect(self.openVideofile) # 打开本地视频按钮函数 self.btn_bofang.clicked.connect(self.begin) # 开始播放按钮函数 def openVideofile(self): global openFilepath, video_path openFilepath = QFileDialog.getOpenFileName(self, '请选择文件', '') print("选取的视频文件地址为：", openFilepath[0]) video_path = openFilepath[0] self.cap = cv2.VideoCapture(video_path) # 读视频流 print(self.cap) self.label_videopath.setText(str(video_path)) if openFilepath[0] is "": md.alert('未读取本地视频文件！') else: video_path = "" md.alert('已读取本地视频文件！') def begin(self): self.timer_camera.start(30) # 定时器开始计时30ms，结果是每过30ms从摄像头中取一帧显示 self.timer_camera.timeout.connect(self.showVideo) # 打开摆臂设置界面即调用show_camera() def showVideo(self): global video_path, openFilepath, flag print(video_path) if openFilepath is not "": try: flag, self.image = self.cap.read() # 从视频流中读取,BGR格式 global show, showImage show = cv2.resize(self.image, (800, 400)) # 把读到的帧的大小重新设置为831, 411 show2 = cv2.cvtColor(show, cv2.COLOR_BGR2RGB) # 视频色彩转换回RGB，这样才是现实的颜色 showImage = QtGui.QImage(show2.data, show2.shape[1], show2.shape[0], QtGui.QImage.Format_RGB888) # 把读取到的视频数据变成QImage形式 self.label_showVideo.setPixmap(QtGui.QPixmap.fromImage(showImage)) # 往显示视频的Label里 显示QImage except Exception as e: if openFilepath is "": self.timer_camera.disconnect() md.alert('连接视频路径不能为空！') else: pass finally: print('flag:', flag) if flag is False: print('放完一次了！') self.label_showVideo.clear() self.cap = cv2.VideoCapture(openFilepath[0]) # 读视频流 QApplication.processEvents() else: pass # 预留 def alert(self, message_alert): self.box = QMessageBox(QMessageBox.Warning, "提示框", message_alert) qyes = self.box.addButton(self.tr("确定"), QMessageBox.YesRole) self.box.exec_() # ---------------------------------------- 程序入口 ----------------------------------------------------------------- if __name__ == '__main__': QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling) # Qt从5.6.0开始，支持High-DPI app = QApplication(sys.argv) # 应用程序对象初始化 md = MainCode() # 主界面别名 md.show() # 界面显示 sys.exit(app.exec_())