Pyqtgraph Imageview Freezes When Multithreaded

I have multiple cameras that are hooked up wirelessly via wifi and I'm trying to stream the data to a client, which displays the streams on a GUI. My issue is that the pyqtgraph Im

Solution 1:

You should not update the GUI from another thread since Qt forbids it . So you must use signals to transmit the information.

classWindowUpdater(QThread):
    imageChanged = pyqtSignal(np.ndarray)
    stop_q = Queue()

    def__init__(self, cam_q: Queue, **kwargs):
        super().__init__(**kwargs)
        self.q = cam_q

    defrun(self) -> None:
        while self.stop_q.empty():
            try:
                timg = self.q.get_nowait()
                graph_lock.acquire(True)
                self.imageChanged.emit(timg.frame)
                graph_lock.release()
            except Empty:
                time.sleep(0.1)

# ...
for i, h in enumerate(hosts):
    img = pg.ImageView(window)
    grid.addWidget(img, i, 0)

    img_item = pg.ImageItem()
    img.addItem(img_item)
    thread = WindowUpdater(img_queue)
    thread.imageChanged.connect(img.setImage)
    threads.append(thread)
# ...

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_{(1) GUI Thread and Worker Thread}