import sys import cv2 from showPic import Ui_MainWindow from PyQt5 import QtGui from PyQt5.QtCore import * from PyQt5.QtGui import * from PyQt5.QtWidgets import * class videoShow(QMainWindow,Ui_MainWindow): def __init__(self): super().__init__() self.setupUi(self) @pyqtSlot() def on_pushButton_record_clicked(self): camera_path = 0 # 0：自带摄像头 1：外接摄像头 "xxx.mp4" "rtsp://admin:pwd@192.168.2.10/cam/..." capture = cv2.VideoCapture(camera_path) # 初始化播放器 流媒体 fourcc = cv2.VideoWriter_fourcc('M', 'P', '4', 'V') # XVID/DIVX MPEG MJPG X264 video_writer = cv2.VideoWriter("image/myself.mp4", fourcc, 25, (960, 540)) # 存放路径、、帧率fps、尺寸（且保证下面的frame也是这个尺寸） while True: flag, frame = capture.read() if flag is False: continue frame = cv2.resize(frame, (960, 540)) video_writer.write(frame) self.display_image(frame, self.label) # 显示帧到标签 key = cv2.waitKey(25) if key == 27: video_writer.release() break @pyqtSlot() def on_pushButton_play_clicked(self): video_path = "image/myself.mp4" # 已经录制好的视频路径 capture = cv2.VideoCapture(video_path) # 初始化播放器 while True: flag, frame = capture.read() if flag is False: break self.display_image(frame, self.label) # 显示帧到标签 key = cv2.waitKey(25) if key == 27: break capture.release() def display_image(self, frame, label): pic_image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB) # 将BGR格式图像转换成RGB height, width = pic_image.shape[:2] pixMap = QImage(pic_image.data, width, height, width * 3, QImage.Format_RGB888) # 将RGB格式图像转换为八位图 pixMap = QPixmap.fromImage(pixMap) ratio = max(width / self.label.width(), height / self.label.height()) pixMap.setDevicePixelRatio(ratio) # 根据图片比例显示 self.label.setAlignment(Qt.AlignCenter) # 设置居中 self.label.setPixmap(pixMap) if __name__ == '__main__': app = QApplication(sys.argv) ui = videoShow() ui.show() sys.exit(app.exec_())修改这段代码，实现点击按钮停止录制以及保存视频

你可以在 `videoShow` 类中添加一个标志位 `recording` 来控制录制的开始和停止。同时，在停止录制时保存视频。以下是修改后的代码示例：

import sys
import cv2

from showPic import Ui_MainWindow
from PyQt5 import QtGui
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *


class videoShow(QMainWindow, Ui_MainWindow):
    def __init__(self):
        super().__init__()
        self.setupUi(self)
        self.recording = False

    @pyqtSlot()
    def on_pushButton_record_clicked(self):
        if self.recording:
            self.recording = False
            self.pushButton_record.setText('开始录制')
            self.video_writer.release()  # 释放视频写入对象
        else:
            self.recording = True
            self.pushButton_record.setText('停止录制')
            camera_path = 0  # 0：自带摄像头   1：外接摄像头    "xxx.mp4"   "rtsp://admin:pwd@192.168.2.10/cam/..."
            capture = cv2.VideoCapture(camera_path)  # 初始化播放器  流媒体
            fourcc = cv2.VideoWriter_fourcc('M', 'P', '4', 'V')  # XVID/DIVX  MPEG  MJPG  X264
            self.video_writer = cv2.VideoWriter("image/myself.mp4", fourcc, 25, (960, 540))  # 存放路径、、帧率fps、尺寸（且保证下面的frame也是这个尺寸）
            while self.recording:
                flag, frame = capture.read()
                if flag is False:
                    continue
                frame = cv2.resize(frame, (960, 540))
                self.video_writer.write(frame)
                self.display_image(frame, self.label)  # 显示帧到标签
                key = cv2.waitKey(25)
                if key == 27:
                    break

    @pyqtSlot()
    def on_pushButton_play_clicked(self):
        video_path = "image/myself.mp4"  # 已经录制好的视频路径
        capture = cv2.VideoCapture(video_path)  # 初始化播放器
        while True:
            flag, frame = capture.read()
            if flag is False:
                break
            self.display_image(frame, self.label)  # 显示帧到标签
            key = cv2.waitKey(25)
            if key == 27:
                break
        capture.release()

    def display_image(self, frame, label):
        pic_image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)  # 将BGR格式图像转换成RGB
        height, width = pic_image.shape[:2]
        pixMap = QImage(
            pic_image.data, width, height, width * 3, QImage.Format_RGB888
        )  # 将RGB格式图像转换为八位图
        pixMap = QPixmap.fromImage(pixMap)
        ratio = max(width / self.label.width(), height / self.label.height())
        pixMap.setDevicePixelRatio(ratio)  # 根据图片比例显示
        self.label.setAlignment(Qt.AlignCenter)  # 设置居中
        self.label.setPixmap(pixMap)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    ui = videoShow()
    ui.show()
    sys.exit(app.exec_())

这样，点击 "开始录制" 按钮将开始录制视频，并将按钮文本更改为 "停止录制"。再次点击 "停止录制" 按钮将停止录制，并保存视频文件。