[BUG] FPS of the OAK-D RGB camera doesn't exceed 12

Even though I have set the FPS at 60, when I re-check the FPS rate with time and , it fails to exceed 12 FPS.

Steps to reproduce the behavior:

1. Run script (Given below)

#!/usr/bin/env python3

import cv2
import depthai as dai
import time

# Create pipeline
pipeline = dai.Pipeline()

# Define source and output
camRgb = pipeline.create(dai.node.ColorCamera)
xoutVideo = pipeline.create(dai.node.XLinkOut)

xoutVideo.setStreamName("video")

# Properties

xoutVideo.input.setBlocking(False)
xoutVideo.input.setQueueSize(1)

# Linking
camRgb.video.link(xoutVideo.input)
count = 0

# Connect to device and start pipeline
with dai.Device(pipeline) as device:

    video = device.getOutputQueue(name="video", maxSize=1, blocking=False)

    while True:
        videoIn = video.get()
        count = count + 1
        print(time.localtime().tm_sec, " - ", count)
        
        # Get BGR frame from NV12 encoded video frame to show with opencv
        # Visualizing the frame on slower hosts might have overhead
        cv2.imshow("video", videoIn.getCvFrame())

        if cv2.waitKey(1) == ord('q'):
            break

1. I’m printing the count value for each iteration along with the ‘second’ (from time). The difference of the count value is always below 12 and not even reaching 30 FPS, Kindly check the attached screenshot.

2. Re-checked it after saving the frames as well. The FPS value is still in the same range.

I would be really grateful if you could help me with increasing the FPS value.

[szabi-luxonis]

@DulminiD very likely your connection speed is USB2. (1920 * 1080 * 3/2) * 12=~36 MiB/s is close to USB2 real bandwidth. To verify can you add the following to your pipeline and see the result? print('Usb speed: ', device.getUsbSpeed().name) HIGH is USB2, SUPER/SUPER_PLUS is USB3.

[neon5d]

Thank you for your quick reply. Indeed, aprltag.py is slow. If I ran the above code, I got 30FPS compared to 12FPS of Apriltag.py. Thank you.