如何在 python 中使用 tkinter 显示带有线程的多视频？

Question

我最近创建了一个程序，它使用 opencv 显示来自 2 个 ip 摄像机的多视频源。 但我决定为我的应用程序创建 UI，现在，我还不清楚如何使用多线程方法来实现它。

这是我用来在 TKinter GUI 中只显示一个摄像头的代码：

import tkinter
import cv2
import PIL.Image, PIL.ImageTk
import time

class App:
    def __init__(self, window, window_title, video_source=0):
        self.window = window
        self.window.title(window_title)
        self.video_source = video_source
        
        # open video source (by default this will try to open the computer webcam)
        self.vid = MyVideoCapture(self.video_source)
        
        # Create a canvas that can fit the above video source size
        self.canvas = tkinter.Canvas(window, width = self.vid.width, height = self.vid.height)
        self.canvas.pack()
         
        # Button that lets the user take a snapshot
        self.btn_snapshot=tkinter.Button(window, text="Snapshot", width=50, command=self.snapshot)
        self.btn_snapshot.pack(anchor=tkinter.CENTER, expand=True)
         
        # After it is called once, the update method will be automatically called every delay milliseconds
        self.delay = 15
        self.update()
         
        self.window.mainloop()
     
    def snapshot(self):
        # Get a frame from the video source
        ret, frame = self.vid.get_frame()
        
        if ret:
            cv2.imwrite("frame-" + time.strftime("%d-%m-%Y-%H-%M-%S") + ".jpg", cv2.cvtColor(frame, cv2.COLOR_RGB2BGR))
    
    def update(self):
        # Get a frame from the video source
        ret, frame = self.vid.get_frame()
        
        if ret:
            self.photo = PIL.ImageTk.PhotoImage(image = PIL.Image.fromarray(frame))
            self.canvas.create_image(0, 0, image = self.photo, anchor = tkinter.NW)
        
        self.window.after(self.delay, self.update)
    
     
class MyVideoCapture:
    def __init__(self, video_source=0):
        # Open the video source
        self.vid = cv2.VideoCapture(video_source)
        if not self.vid.isOpened():
            raise ValueError("Unable to open video source", video_source)
    
        # Get video source width and height
        self.width = self.vid.get(cv2.CAP_PROP_FRAME_WIDTH)
        self.height = self.vid.get(cv2.CAP_PROP_FRAME_HEIGHT)
    
    def get_frame(self):
        if self.vid.isOpened():
            ret, frame = self.vid.read()
            if ret:
                # Return a boolean success flag and the current frame converted to BGR
                return (ret, cv2.cvtColor(frame, cv2.COLOR_BGR2RGB))
            else:
                return (ret, None)
        else:
            return (ret, None)
    
    # Release the video source when the object is destroyed
    def __del__(self):
        if self.vid.isOpened():
            self.vid.release()
 
 # Create a window and pass it to the Application object
App(tkinter.Tk(), "Tkinter and OpenCV")

这是我之前的应用程序，它在不同线程中显示多个视频源：

from threading import Thread
import cv2
import time

class VideoWriterWidget(object):
    def __init__(self, video_file_name, src=0):
        # Create a VideoCapture object
        self.frame_name = str(src)
        self.video_file = video_file_name
        self.video_file_name = video_file_name + '.avi'
        self.capture = cv2.VideoCapture(src)

        # Default resolutions of the frame are obtained (system dependent)
        self.frame_width = int(self.capture.get(3))
        self.frame_height = int(self.capture.get(4))

        # Set up codec and output video settings
        self.codec = cv2.VideoWriter_fourcc('M','J','P','G')
        self.output_video = cv2.VideoWriter(self.video_file_name, self.codec, 30, (self.frame_width, self.frame_height))

        # Start the thread to read frames from the video stream
        self.thread = Thread(target=self.update, args=())
        self.thread.daemon = True
        self.thread.start()

        # Start another thread to show/save frames
        self.start_recording()
        print('initialized {}'.format(self.video_file))

    def update(self):
        # Read the next frame from the stream in a different thread
        while True:
            if self.capture.isOpened():
                (self.status, self.frame) = self.capture.read()

    def show_frame(self):
        # Display frames in main program
        if self.status:
            cv2.imshow(self.frame_name, self.frame)

        # Press Q on keyboard to stop recording
        key = cv2.waitKey(1)
        if key == ord('q'):
            self.capture.release()
            self.output_video.release()
            cv2.destroyAllWindows()
            exit(1)

    def save_frame(self):
        # Save obtained frame into video output file
        self.output_video.write(self.frame)

    def start_recording(self):
        # Create another thread to show/save frames
        def start_recording_thread():
            while True:
                try:
                    self.show_frame()
                    self.save_frame()
                except AttributeError:
                    pass
        self.recording_thread = Thread(target=start_recording_thread, args=())
        self.recording_thread.daemon = True
        self.recording_thread.start()

if __name__ == '__main__':
    src1 = 'Your link1'
    video_writer_widget1 = VideoWriterWidget('Camera 1', src1)
    src2 = 'Your link2'
    video_writer_widget2 = VideoWriterWidget('Camera 2', src2)
    src3 = 'Your link3'
    video_writer_widget3 = VideoWriterWidget('Camera 3', src3)

    # Since each video player is in its own thread, we need to keep the main thread alive.
    # Keep spinning using time.sleep() so the background threads keep running
    # Threads are set to daemon=True so they will automatically die 
    # when the main thread dies
    while True:
        time.sleep(5)

有人可以帮助我如何在我的新应用程序中使用带有线程的 tkinter 使用我以前的代码（显示多摄像头）吗？

Answer 1

tkinter（像许多其他 GUI 一样）不喜欢在线程中使用小部件，所以首先我会尝试在没有线程的情况下在主进程中运行所有组件。

在示例中，我将大部分代码移至基于tkinter.Frame 的类以创建小部件 我可以多次使用不同的流。因为我只有一个摄像头（并且系统不能多次使用同一个摄像头）所以我找到了一些外部流/文件来测试它。因为流发送非常大的图像，所以我将大小更改为400, 300

当无需调整图像大小时，代码运行速度很快。
当它必须调整图像大小时，有时会出现问题，但仍然可以。

---

import tkinter
import cv2
import PIL.Image, PIL.ImageTk
import time

# widgets with canvas and camera

class tkCamera(tkinter.Frame):

    def __init__(self, window, video_source=0):
        super().__init__(window)
        
        self.window = window
        
        #self.window.title(window_title)
        self.video_source = video_source
        self.vid = MyVideoCapture(self.video_source)

        self.canvas = tkinter.Canvas(window, width=self.vid.width, height=self.vid.height)
        self.canvas.pack()
         
        # Button that lets the user take a snapshot
        self.btn_snapshot = tkinter.Button(window, text="Snapshot", width=50, command=self.snapshot)
        self.btn_snapshot.pack(anchor=tkinter.CENTER, expand=True)
         
        # After it is called once, the update method will be automatically called every delay milliseconds
        self.delay = 15
        self.update_widget()

    def snapshot(self):
        # Get a frame from the video source
        ret, frame = self.vid.get_frame()
        
        if ret:
            cv2.imwrite("frame-" + time.strftime("%d-%m-%Y-%H-%M-%S") + ".jpg", cv2.cvtColor(frame, cv2.COLOR_RGB2BGR))
    
    def update_widget(self):
        # Get a frame from the video source
        ret, frame = self.vid.get_frame()
        
        if ret:
            self.image = PIL.Image.fromarray(frame)
            self.photo = PIL.ImageTk.PhotoImage(image=self.image)
            self.canvas.create_image(0, 0, image = self.photo, anchor = tkinter.NW)
        
        self.window.after(self.delay, self.update_widget)


class App:

    def __init__(self, window, window_title, video_source1=0, video_source2=0):
        self.window = window

        self.window.title(window_title)
        
        # open video source (by default this will try to open the computer webcam)
        self.vid1 = tkCamera(window, video_source1)
        self.vid1.pack()
        
        self.vid2 = tkCamera(window, video_source2)
        self.vid2.pack()
        
        # Create a canvas that can fit the above video source size
         
        self.window.mainloop()
     
    
     
class MyVideoCapture:
    def __init__(self, video_source=0):
        # Open the video source
        self.vid = cv2.VideoCapture(video_source)
        if not self.vid.isOpened():
            raise ValueError("Unable to open video source", video_source)
    
        # Get video source width and height
        self.width = self.vid.get(cv2.CAP_PROP_FRAME_WIDTH)
        self.height = self.vid.get(cv2.CAP_PROP_FRAME_HEIGHT)
    
        self.width = 400
        self.height = 300
    
    def get_frame(self):
        if self.vid.isOpened():
            ret, frame = self.vid.read()
            if ret:
                frame = cv2.resize(frame, (400, 300))
                # Return a boolean success flag and the current frame converted to BGR
                return (ret, cv2.cvtColor(frame, cv2.COLOR_BGR2RGB))
            else:
                return (ret, None)
        else:
            return (ret, None)
    
    # Release the video source when the object is destroyed
    def __del__(self):
        if self.vid.isOpened():
            self.vid.release()
 
# Create a window and pass it to the Application object
App(tkinter.Tk(), "Tkinter and OpenCV", 0, 'https://imageserver.webcamera.pl/rec/krupowki-srodek/latest.mp4')

---

如果您打算处理框架 - 即。检测运动或面部 - 然后来自 get_frame 的代码可以在单独的头中运行。线程会一直处理帧并分配给self.frame，而get_frame() 应该只返回当前的self.frame。

在博客pyImageSearch 中查看类似的想法 Increasing webcam FPS with Python and OpenCV.

也许你甚至可以使用

 from imutils.video import WebcamVideoStream

---

编辑：

版本仍然没有线程，但带有源列表，因此它可以显示许多相机。但是对于超过 2 个来源，它无法显示 - 所以这需要使用 threads。

顺便说一句： tkinter 中的小部件和窗口已经有方法 update() 所以我将它重命名为 update_frame()

在snapshot 中，我使用了pilow.image.save()，因此我不必读取新帧并转换为BGR - 我可以在流停止时拍摄快照。 Button 仅停止替换画布上的图像，但不会停止从线程中的流中读取帧-因此其他功能仍可以处理或记录流。

---

import tkinter
import cv2
import PIL.Image, PIL.ImageTk
import time

class MyVideoCapture:

    def __init__(self, video_source=0, width=None, height=None):
    
        # Open the video source
        self.vid = cv2.VideoCapture(video_source)
        if not self.vid.isOpened():
            raise ValueError("Unable to open video source", video_source)

        self.width = width
        self.height = height
    
        # Get video source width and height
        if not self.width:
            self.width = int(self.vid.get(cv2.CAP_PROP_FRAME_WIDTH))    # convert float to int
        if not self.height:
            self.height = int(self.vid.get(cv2.CAP_PROP_FRAME_HEIGHT))  # convert float to int

        self.ret = False
        self.frame = None

    def process(self):
        ret = False
        frame = None
        
        if self.vid.isOpened():
            ret, frame = self.vid.read()
            if ret:
                frame = cv2.resize(frame, (self.width, self.height))
                frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
        
        self.ret = ret
        self.frame = frame
        
    def get_frame(self):
        self.process()  # later run in thread
        return self.ret, self.frame
    
    # Release the video source when the object is destroyed
    def __del__(self):
        if self.vid.isOpened():
            self.vid.release()
 
 
class tkCamera(tkinter.Frame):

    def __init__(self, window, video_source=0, width=None, height=None):
        super().__init__(window)
        
        self.window = window
        
        #self.window.title(window_title)
        self.video_source = video_source
        self.vid = MyVideoCapture(self.video_source, width, height)

        self.canvas = tkinter.Canvas(window, width=self.vid.width, height=self.vid.height)
        self.canvas.pack()
         
        # Button that lets the user take a snapshot
        self.btn_snapshot = tkinter.Button(window, text="Snapshot", width=50, command=self.snapshot)
        self.btn_snapshot.pack(anchor='center', expand=True)
         
        # After it is called once, the update method will be automatically called every delay milliseconds
        self.delay = 15
        self.update_widget()

    def snapshot(self):
        # Get a frame from the video source
        ret, frame = self.vid.get_frame()
        
        if ret:
            cv2.imwrite("frame-" + time.strftime("%d-%m-%Y-%H-%M-%S") + ".jpg", cv2.cvtColor(frame, cv2.COLOR_RGB2BGR))
    
    def update_widget(self):
        # Get a frame from the video source
        ret, frame = self.vid.get_frame()
        
        if ret:
            self.image = PIL.Image.fromarray(frame)
            self.photo = PIL.ImageTk.PhotoImage(image=self.image)
            self.canvas.create_image(0, 0, image = self.photo, anchor = tkinter.NW)
        
        self.window.after(self.delay, self.update_widget)


class App:

    def __init__(self, window, window_title, video_sources):
        self.window = window

        self.window.title(window_title)
        
        self.vids = []
        
        for source in video_sources:
            vid = tkCamera(window, source, 400, 300)
            vid.pack()
            self.vids.append(vid)
        
        # Create a canvas that can fit the above video source size
         
        self.window.mainloop()
    
if __name__ == '__main__':     

    sources = [
        0, 
        #'https://imageserver.webcamera.pl/rec/krupowki-srodek/latest.mp4',
        #'https://imageserver.webcamera.pl/rec/skolnity/latest.mp4',
        'https://imageserver.webcamera.pl/rec/krakow4/latest.mp4',
    ]
    
        
    # Create a window and pass it to the Application object
    App(tkinter.Tk(), "Tkinter and OpenCV", sources)

---

编辑

使用threads 读取和处理帧的版本。我添加time(1/fps) 仅在需要时对其进行处理，以便它更流畅地工作。对于延迟15，它有时会冻结。

我使用的来源只有 24 秒，所以几秒钟后它们就会停止。

---

import tkinter
import cv2
import PIL.Image, PIL.ImageTk
import time
import threading

class MyVideoCapture:

    def __init__(self, video_source=0, width=None, height=None, fps=None):
    
        self.video_source = video_source
        self.width = width
        self.height = height
        self.fps = fps
        
        # Open the video source
        self.vid = cv2.VideoCapture(video_source)
        if not self.vid.isOpened():
            raise ValueError("[MyVideoCapture] Unable to open video source", video_source)

        # Get video source width and height
        if not self.width:
            self.width = int(self.vid.get(cv2.CAP_PROP_FRAME_WIDTH))    # convert float to int
        if not self.height:
            self.height = int(self.vid.get(cv2.CAP_PROP_FRAME_HEIGHT))  # convert float to int
        if not self.fps:
            self.fps = int(self.vid.get(cv2.CAP_PROP_FPS))  # convert float to int

        # default value at start        
        self.ret = False
        self.frame = None

        # start thread
        self.running = True
        self.thread = threading.Thread(target=self.process)
        self.thread.start()
        
    def process(self):
        while self.running:
            ret, frame = self.vid.read()
            
            if ret:
                # process image
                frame = cv2.resize(frame, (self.width, self.height))
                frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
            else:
                print('[MyVideoCapture] stream end:', self.video_source)
                # TODO: reopen stream
                self.running = False
                break
                
            # assign new frame
            self.ret = ret
            self.frame = frame
            
            # sleep for next frame
            time.sleep(1/self.fps)
        
    def get_frame(self):
        return self.ret, self.frame
    
    # Release the video source when the object is destroyed
    def __del__(self):
        # stop thread
        if self.running:
            self.running = False
            self.thread.join()

        # relase stream
        if self.vid.isOpened():
            self.vid.release()
            
 
class tkCamera(tkinter.Frame):

    def __init__(self, window, text="", video_source=0, width=None, height=None):
        super().__init__(window)
        
        self.window = window
        
        #self.window.title(window_title)
        self.video_source = video_source
        self.vid = MyVideoCapture(self.video_source, width, height)

        self.label = tkinter.Label(self, text=text)
        self.label.pack()
        
        self.canvas = tkinter.Canvas(self, width=self.vid.width, height=self.vid.height)
        self.canvas.pack()

        # Button that lets the user take a snapshot
        self.btn_snapshot = tkinter.Button(self, text="Start", command=self.start)
        self.btn_snapshot.pack(anchor='center', side='left')
        
        self.btn_snapshot = tkinter.Button(self, text="Stop", command=self.stop)
        self.btn_snapshot.pack(anchor='center', side='left')
         
        # Button that lets the user take a snapshot
        self.btn_snapshot = tkinter.Button(self, text="Snapshot", command=self.snapshot)
        self.btn_snapshot.pack(anchor='center', side='left')
         
        # After it is called once, the update method will be automatically called every delay milliseconds
        # calculate delay using `FPS`
        self.delay = int(1000/self.vid.fps)

        print('[tkCamera] source:', self.video_source)
        print('[tkCamera] fps:', self.vid.fps, 'delay:', self.delay)
        
        self.image = None
        
        self.running = True
        self.update_frame()

    def start(self):
        if not self.running:
            self.running = True
            self.update_frame()

    def stop(self):
        if self.running:
           self.running = False
    
    def snapshot(self):
        # Get a frame from the video source
        #ret, frame = self.vid.get_frame()
        #if ret:
        #    cv2.imwrite(time.strftime("frame-%d-%m-%Y-%H-%M-%S.jpg"), cv2.cvtColor(self.frame, cv2.COLOR_RGB2BGR))
        
        # Save current frame in widget - not get new one from camera - so it can save correct image when it stoped
        if self.image:
            self.image.save(time.strftime("frame-%d-%m-%Y-%H-%M-%S.jpg"))
            
    def update_frame(self):
        # widgets in tkinter already have method `update()` so I have to use different name -

        # Get a frame from the video source
        ret, frame = self.vid.get_frame()
        
        if ret:
            self.image = PIL.Image.fromarray(frame)
            self.photo = PIL.ImageTk.PhotoImage(image=self.image)
            self.canvas.create_image(0, 0, image=self.photo, anchor='nw')
        
        if self.running:
            self.window.after(self.delay, self.update_frame)


class App:

    def __init__(self, window, window_title, video_sources):
        self.window = window

        self.window.title(window_title)
        
        self.vids = []

        columns = 2
        for number, source in enumerate(video_sources):
            text, stream = source
            vid = tkCamera(self.window, text, stream, 400, 300)
            x = number % columns
            y = number // columns
            vid.grid(row=y, column=x)
            self.vids.append(vid)
        
        self.window.protocol("WM_DELETE_WINDOW", self.on_closing)
        self.window.mainloop()
    
    def on_closing(self, event=None):
        print('[App] stoping threads')
        for source in self.vids:
            source.vid.running = False
        print('[App] exit')
        self.window.destroy()

if __name__ == '__main__':     

    sources = [
        ('me', 0), 
        ('Zakopane, Poland', 'https://imageserver.webcamera.pl/rec/krupowki-srodek/latest.mp4'),
        ('Kraków, Poland', 'https://imageserver.webcamera.pl/rec/krakow4/latest.mp4'),
        ('Warszawa, Poland', 'https://imageserver.webcamera.pl/rec/warszawa/latest.mp4'),
        #('Baltic See, Poland', 'https://imageserver.webcamera.pl/rec/chlopy/latest.mp4'),
        #('Mountains, Poland', 'https://imageserver.webcamera.pl/rec/skolnity/latest.mp4'),
    ]
        
    # Create a window and pass it to the Application object
    App(tkinter.Tk(), "Tkinter and OpenCV", sources)

---

编辑

可以录制视频的版本。

cv2 需要带有 BGR 颜色的帧才能正确保存，所以我必须在帧转换为 RGB 之前保存它。

我将大部分代码移至MyVideoCapture，因此即使没有tkinter 也可以使用它。我还在MyVideoCapture 中添加了选项以获取cv2 array 或pillow.image 的图像 - 所以现在它在thread 内转换为pillow，因此主线程不必这样做。

---

import tkinter
import cv2
import PIL.Image, PIL.ImageTk
import time
import threading

class MyVideoCapture:

    def __init__(self, video_source=0, width=None, height=None, fps=None):
    
        self.video_source = video_source
        self.width = width
        self.height = height
        self.fps = fps
        
        # Open the video source
        self.vid = cv2.VideoCapture(video_source)
        if not self.vid.isOpened():
            raise ValueError("[MyVideoCapture] Unable to open video source", video_source)

        # Get video source width and height
        if not self.width:
            self.width = int(self.vid.get(cv2.CAP_PROP_FRAME_WIDTH))    # convert float to int
        if not self.height:
            self.height = int(self.vid.get(cv2.CAP_PROP_FRAME_HEIGHT))  # convert float to int
        if not self.fps:
            self.fps = int(self.vid.get(cv2.CAP_PROP_FPS))  # convert float to int

        # default value at start        
        self.ret = False
        self.frame = None
        
        self.convert_color = cv2.COLOR_BGR2RGB
        #self.convert_color = cv2.COLOR_BGR2GRAY
        self.convert_pillow = True
        
        # default values for recording        
        self.recording = False
        self.recording_filename = 'output.mp4'
        self.recording_writer = None
        
        # start thread
        self.running = True
        self.thread = threading.Thread(target=self.process)
        self.thread.start()
        
    def start_recording(self, filename=None):
        if self.recording:
            print('[MyVideoCapture] already recording:', self.recording_filename)
        else:
            # VideoWriter constructors
            #.mp4 = codec id 2
            if filename:
                self.recording_filename = filename
            else:
                self.recording_filename = time.strftime("%Y.%m.%d %H.%M.%S", time.localtime()) + ".avi"
            #fourcc = cv2.VideoWriter_fourcc(*'I420') # .avi
            #fourcc = cv2.VideoWriter_fourcc(*'MP4V') # .avi
            fourcc = cv2.VideoWriter_fourcc(*'MP42') # .avi
            #fourcc = cv2.VideoWriter_fourcc(*'AVC1') # error libx264
            #fourcc = cv2.VideoWriter_fourcc(*'H264') # error libx264
            #fourcc = cv2.VideoWriter_fourcc(*'WRAW') # error --- no information ---
            #fourcc = cv2.VideoWriter_fourcc(*'MPEG') # .avi 30fps
            #fourcc = cv2.VideoWriter_fourcc(*'MJPG') # .avi
            #fourcc = cv2.VideoWriter_fourcc(*'XVID') # .avi
            #fourcc = cv2.VideoWriter_fourcc(*'H265') # error 
            self.recording_writer = cv2.VideoWriter(self.recording_filename, fourcc, self.fps, (self.width, self.height))
            self.recording = True
            print('[MyVideoCapture] started recording:', self.recording_filename)
                   
    def stop_recording(self):
        if not self.recording:
            print('[MyVideoCapture] not recording')
        else:
            self.recording = False
            self.recording_writer.release() 
            print('[MyVideoCapture] stop recording:', self.recording_filename)
               
    def record(self, frame):
        # write frame to file         
        if self.recording_writer and self.recording_writer.isOpened():
            self.recording_writer.write(frame)
 
     
    def process(self):
        while self.running:
            ret, frame = self.vid.read()
            
            if ret:
                # process image
                frame = cv2.resize(frame, (self.width, self.height))

                # it has to record before converting colors
                if self.recording:
                    self.record(frame)
                    
                if self.convert_pillow:
                    frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
                    frame = PIL.Image.fromarray(frame)
            else:
                print('[MyVideoCapture] stream end:', self.video_source)
                # TODO: reopen stream
                self.running = False
                if self.recording:
                    self.stop_recording()
                break
                
            # assign new frame
            self.ret = ret
            self.frame = frame

            # sleep for next frame
            time.sleep(1/self.fps)
        
    def get_frame(self):
        return self.ret, self.frame
    
    # Release the video source when the object is destroyed
    def __del__(self):
        # stop thread
        if self.running:
            self.running = False
            self.thread.join()

        # relase stream
        if self.vid.isOpened():
            self.vid.release()
            
 
class tkCamera(tkinter.Frame):

    def __init__(self, window, text="", video_source=0, width=None, height=None):
        super().__init__(window)
        
        self.window = window
        
        #self.window.title(window_title)
        self.video_source = video_source
        self.vid = MyVideoCapture(self.video_source, width, height)

        self.label = tkinter.Label(self, text=text)
        self.label.pack()
        
        self.canvas = tkinter.Canvas(self, width=self.vid.width, height=self.vid.height)
        self.canvas.pack()

        # Button that lets the user take a snapshot
        self.btn_snapshot = tkinter.Button(self, text="Start", command=self.start)
        self.btn_snapshot.pack(anchor='center', side='left')
        
        self.btn_snapshot = tkinter.Button(self, text="Stop", command=self.stop)
        self.btn_snapshot.pack(anchor='center', side='left')
         
        # Button that lets the user take a snapshot
        self.btn_snapshot = tkinter.Button(self, text="Snapshot", command=self.snapshot)
        self.btn_snapshot.pack(anchor='center', side='left')
         
        # After it is called once, the update method will be automatically called every delay milliseconds
        # calculate delay using `FPS`
        self.delay = int(1000/self.vid.fps)

        print('[tkCamera] source:', self.video_source)
        print('[tkCamera] fps:', self.vid.fps, 'delay:', self.delay)
        
        self.image = None
        
        self.running = True
        self.update_frame()

    def start(self):
        #if not self.running:
        #    self.running = True
        #    self.update_frame()
        self.vid.start_recording()

    def stop(self):
        #if self.running:
        #   self.running = False
        self.vid.stop_recording()
    
    def snapshot(self):
        # Get a frame from the video source
        #ret, frame = self.vid.get_frame()
        #if ret:
        #    cv2.imwrite(time.strftime("frame-%d-%m-%Y-%H-%M-%S.jpg"), cv2.cvtColor(self.frame, cv2.COLOR_RGB2BGR))
        
        # Save current frame in widget - not get new one from camera - so it can save correct image when it stoped
        if self.image:
            self.image.save(time.strftime("frame-%d-%m-%Y-%H-%M-%S.jpg"))
            
    def update_frame(self):
        # widgets in tkinter already have method `update()` so I have to use different name -

        # Get a frame from the video source
        ret, frame = self.vid.get_frame()
        
        if ret:
            #self.image = PIL.Image.fromarray(frame)
            self.image = frame
            self.photo = PIL.ImageTk.PhotoImage(image=self.image)
            self.canvas.create_image(0, 0, image=self.photo, anchor='nw')
        
        if self.running:
            self.window.after(self.delay, self.update_frame)


class App:

    def __init__(self, window, window_title, video_sources):
        self.window = window

        self.window.title(window_title)
        
        self.vids = []

        columns = 2
        for number, source in enumerate(video_sources):
            text, stream = source
            vid = tkCamera(self.window, text, stream, 400, 300)
            x = number % columns
            y = number // columns
            vid.grid(row=y, column=x)
            self.vids.append(vid)
        
        self.window.protocol("WM_DELETE_WINDOW", self.on_closing)
        self.window.mainloop()
    
    def on_closing(self, event=None):
        print('[App] stoping threads')
        for source in self.vids:
            source.vid.running = False
        print('[App] exit')
        self.window.destroy()

if __name__ == '__main__':     

    sources = [
        ('me', 0), 
        ('Zakopane, Poland', 'https://imageserver.webcamera.pl/rec/krupowki-srodek/latest.mp4'),
        ('Kraków, Poland', 'https://imageserver.webcamera.pl/rec/krakow4/latest.mp4'),
        ('Warszawa, Poland', 'https://imageserver.webcamera.pl/rec/warszawa/latest.mp4'),
        #('Baltic See, Poland', 'https://imageserver.webcamera.pl/rec/chlopy/latest.mp4'),
        #('Mountains, Poland', 'https://imageserver.webcamera.pl/rec/skolnity/latest.mp4'),
    ]
        
    # Create a window and pass it to the Application object
    App(tkinter.Tk(), "Tkinter and OpenCV", sources)

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编辑：

我创建了可以选择来源的版本 - 所以它可以显示录制的视频。

这段代码很混乱。对话框窗口可以在单独的类中。

我无法在此处输入代码，因为答案限制为 30000 个字符。

我把它放在GitHub上：python-cv2-streams-viewer

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