self.root = tk.Tk() self.root.title("视频处理系统") self.root.geometry("1250x1200") global last_frame1 # creating global variable self.last_frame1 = np.zeros((480, 640, 3), dtype=np.uint8) global last_frame2 # creating global variable self.last_frame2 = np.zeros((480, 640, 3), dtype=np.uint8) global cap1 global cap2 self.cap1 = cv2.VideoCapture("./movie/video_1.mp4") self.cap2 = cv2.VideoCapture("./movie/video_1_sol.mp4") self.key = 0 self.button2 = tk.Button(self.root, text="打开视频", command=lambda: [self.show_vid(), self.show_vid2()]) self.button2.grid(row=0, column=1) def show_vid(self): if not self.cap1.isOpened(): print("cant open the camera1") flag1, frame1 = self.cap1.read() if frame1 is None: print("Failed to read frame from camera1. Stopping...") self.cap1.release() return frame1 = cv2.resize(frame1, (640, 480)) if flag1 is None: print("Major error!") elif flag1: global last_frame1 self.last_frame1 = frame1.copy() pic = cv2.cvtColor(self.last_frame1, cv2.COLOR_BGR2RGB) img = Image.fromarray(pic) imgtk = ImageTk.PhotoImage(image=img) self.lmain.imgtk = imgtk self.lmain.configure(image=imgtk) if self.key==0: self.lmain.after(10, self.show_vid)不能再次播放视频怎么解决

在你的代码中，当你调用 show_vid() 函数时，它只会播放一次视频，因为在函数内部，你只设置了一次 after() 函数来更新视频帧。如果想要循环播放视频，可以使用一个 while 循环来不断读取视频帧并更新显示，例如：

def show_vid(self):
    while True:
        if not self.cap1.isOpened():
            print("cant open the camera1")
            break
        flag1, frame1 = self.cap1.read()
        if frame1 is None:
            print("Failed to read frame from camera1. Stopping...")
            self.cap1.release()
            break
        frame1 = cv2.resize(frame1, (640, 480))
        if flag1 is None:
            print("Major error!")
        elif flag1:
            global last_frame1
            self.last_frame1 = frame1.copy()
            pic = cv2.cvtColor(self.last_frame1, cv2.COLOR_BGR2RGB)
            img = Image.fromarray(pic)
            imgtk = ImageTk.PhotoImage(image=img)
            self.lmain.imgtk = imgtk
            self.lmain.configure(image=imgtk)
            if self.key==0:
                self.lmain.after(10)

这样，当你调用 show_vid() 函数时，它会不断循环读取视频帧并更新显示，直到你手动停止程序。