def stop_all(self): self.is_running = False for url in list(self.video_streams.keys()): self.del_video(url)

`stop_all` 函数的作用是停止当前的Intel RealSense相机中的所有视频流。这个函数首先设置标志`self.is_running`为False，表示程序不再运行。接着，它遍历存储视频流URLs的列表（`self.video_streams.keys()`），并针对每个URL调用`del_video`方法来关闭相应的视频流。

具体实现如下：

def stop_all(self):
    """
    Stops all active video streams.

    :param self: An instance of the class using this method.
    """
    self.is_running = False
    for url in self.video_streams.keys():  # Iterate through each video stream URL
        self.del_video(url)  # Stop and remove the video stream by its URL

在这个示例中，`self.del_video(url)`可能是这样定义的，用来关闭特定的视频流[^1]：

def del_video(self, url):
    """
    Deletes a specific video stream from the camera.

    :param url: The URL of the video stream to be stopped.
    """
    # Code to call the RealSense API to close the video stream
    pass