• DepthAI

  • ’replay’ behavior with poll()

Hello,

I'm running the PeopleTraker sample on the OAK-1.

The PeopleTrasker sample uses a callback. (code 1)

I'm trying to get it working without callbacks (using poll). (code 2)

I would like to use a video file on my PC in the same experiment as Code 1. Please tell me how to set it up.

Is it the code part of the (*) part?

Thank you.


===========================================================

with OakCamera(replay="videofile.mp4") as oak:

    :

    :

def cb(packet: TrackerPacket, vis: Visualizer):

    :

    :

oak.visualize(tracker.out.tracker, callback=cb)

oak.start(blocking=True)

===========================================================


[code 2]

===========================================================

color = oak.create_camera('color')

    :

    :

features = pipeline.create(dai.node.FeatureTracker) # Create new pipeline nodes

color.node.video.link(features.inputImage)

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^(\*)

    :

    :

oak.start()



q = oak.device.getOutputQueue('features') # Create output queue after calling start()

while oak.running():

    if q.has():

        result = q.get()

    oak.poll()

===========================================================
  • erik replied to this.

    Hi ayamada , Could you make the script readable? Looks like it has tons of issues at the moment.

        Hi erik , Thank you for your prompt reply.

        After reviewing my software, as you pointed out, I found that PeopleTraker using Poll was not working properly.

        The reason I started considering Poll is because I want to use the OAK-1 footage in other function.

        Therefore, I tried to thread it and communicate with Queue, but when I started it with a thread, the next thread could not be started, and it didn't go well.

        oak.start(blocking=False) is using.

        I couldn't identify the cause, so I thought of using polling processing to include processing that intentionally yields to other threads.

        If you have any useful information for threading "with OakCamera() as oak:", please let me know.

        Thank you

        • erik replied to this.

            ayamada unfortunately, you'll need to create OakCamera() in the main thread, then you can pass it to other threads for operations.