I have five cameras.

I took the multiple camera example and here are the errors:

c:\Users\tonya\OneDrive - Viewray Systems Inc\Documents\Python>python multipleDevices.py

===Connected to 18443010B1C8690F00

MXID: 18443010B1C8690F00

Num of cameras: 1

USB speed: UsbSpeed.SUPER

Board name: OAK-1

←[31mF: [global] [ 0] [ThreadN] dispatcherResponseServe:928 no request for this response: XLINK_READ_REL_RESP 1

←[0m

[18443010B1C8690F00] [1.1.1.1] [1731631485.297] [host] [warning] Device crashed, but no crash dump could be extracted.

Then I have written a few of my own codes to try to talk to multiple cameras. Here is the code:

#!/usr/bin/env python3

# Show image from two cameras

import cv2

import depthai as dai

# List all the cameras available

idev = 0

for device in dai.Device.getAllAvailableDevices():

print(f"{device.name} {device.getMxId()} {device.state}")

idev = idev + 1

# Need at least two cameras.

if idev < 2:

print( "Found {idev} cameras. Need at least two cameras." )

# Create pipeline

pipeline1 = dai.Pipeline()

pipeline2 = dai.Pipeline()

# Define source and output

camRgb1 = pipeline1.create(dai.node.ColorCamera)

camRgb2 = pipeline2.create(dai.node.ColorCamera)

xoutVideo1 = pipeline1.create(dai.node.XLinkOut)

xoutVideo2 = pipeline2.create(dai.node.XLinkOut)

xoutVideo1.setStreamName("video1")

xoutVideo2.setStreamName("video2")

# Properties

camRgb1.setBoardSocket(dai.CameraBoardSocket.CAM_A)

camRgb1.setResolution(dai.ColorCameraProperties.SensorResolution.THE_1080_P)

camRgb1.setVideoSize(1920, 1080)

camRgb2.setBoardSocket(dai.CameraBoardSocket.CAM_A)

camRgb2.setResolution(dai.ColorCameraProperties.SensorResolution.THE_1080_P)

camRgb2.setVideoSize(1920, 1080)

xoutVideo1.input.setBlocking(False)

xoutVideo2.input.setQueueSize(1)

xoutVideo1.input.setBlocking(False)

xoutVideo2.input.setQueueSize(1)

# Linking

camRgb1.video.link(xoutVideo1.input)

camRgb2.video.link(xoutVideo2.input)

# Connect to device and start pipeline

camera = dai.Device.getAllAvailableDevices()

device_info1 = dai.DeviceInfo(camera[0].getMxId()) # MXID

device_info2 = dai.DeviceInfo(camera[1].getMxId())

with dai.Device(pipeline1, device_info1) as device1:

with dai.Device(pipeline2, device_info2) as device2:

    video1 = device1.getOutputQueue(name="video1", maxSize=1, blocking=False)

    video2 = device2.getOutputQueue(name="video2", maxSize=1, blocking=False)

    

    cnt = 0

    while True:

        videoIn1 = video1.get()

        videoIn2 = video2.get()

        # Get BGR frame from NV12 encoded video frame to show with opencv

        # Visualizing the frame on slower hosts might have overhead

        cv2.imshow("video1", videoIn1.getCvFrame())

        cv2.imshow("video2", videoIn2.getCvFrame())      

        if cnt == 0:

            cv2.resizeWindow( "video1", 200, 200 )

            cv2.resizeWindow( "video2", 200, 200 )

            cv2.moveWindow( "video1", 100, 100 )

            cv2.moveWindow( "video2", 300, 100 )



        cnt = cnt + 1

        if cv2.waitKey(100) == ord('q'):

            break

I did see two windows come up. Here are the error messages:

c:\Users\tonya\OneDrive - Viewray Systems Inc\Documents\Python>python vid2.py

1.1.1.1 18443010B1C8690F00 XLinkDeviceState.X_LINK_UNBOOTED

1.1.1.2 18443010A175680F00 XLinkDeviceState.X_LINK_UNBOOTED

1.1.3 18443010E109690F00 XLinkDeviceState.X_LINK_UNBOOTED

1.1.4 1844301081D1650F00 XLinkDeviceState.X_LINK_UNBOOTED

1.1.2 1844301081D4650F00 XLinkDeviceState.X_LINK_UNBOOTED

c:\Users\tonya\OneDrive - Viewray Systems Inc\Documents\Python\vid2.py:58: DeprecationWarning: Use constructor taking 'UsbSpeed' instead

with dai.Device(pipeline1, device_info1) as device1:

c:\Users\tonya\OneDrive - Viewray Systems Inc\Documents\Python\vid2.py:59: DeprecationWarning: Use constructor taking 'UsbSpeed' instead

with dai.Device(pipeline2, device_info2) as device2:

←[31mF: [global] [ 0] [ThreadN] dispatcherResponseServe:928 no request for this response: XLINK_READ_REL_RESP 1

←[0m

[18443010A175680F00] [1.1.1.2] [1731631676.974] [host] [warning] Device crashed, but no crash dump could be extracted.

Traceback (most recent call last):

File "c:\Users\tonya\OneDrive - Viewray Systems Inc\Documents\Python\vid2.py", line 68, in <module>

videoIn2 = video2.get()

           ^^^^^^^^^^^^

RuntimeError: Communication exception - possible device error/misconfiguration. Original message 'Couldn't read data from stream: 'video2' (X_LINK_ERROR)'