5. FAQ

1、Why do I get the following error when running python3 examples/depth_viewer.py on Jetson Nano?

illegal instruction (core dumped)

Answer: Check your OpenCV installation. If you encounter the same error when running

import cv2

export OPENBLAS_CORETYPE=ARMV8 (or whatever the actual hardware is) before launching python should hopefully get around this. For example:

OPENBLAS_CORETYPE=ARMV8 python

If you would like to make this export permanent, you should open your .bashrc file by typing on the terminal:

nano ~/.bashrc

and add the following line at the end of the file:

export OPENBLAS_CORETYPE=ARMV8

Refer to this post for more information on how to resolve the issue.

2、 Why do I get the following error when running python3 examples/depth_viewer.py?

 msg:failed to open usb device!  error: OB_USB_STATUS_ACCESS
  - type:St13runtime_error
[2023-07-04 17:09:19.891859][warning][117523][EnumeratorLibusb.cpp:342] failed to create usb device at index: 1, url:2-1.4.1-6
[2023-07-04 17:09:20.391989][error][117523][DeviceLibusb.cpp:109] failed to open usb device!  error: OB_USB_STATUS_ACCESS
[2023-07-04 17:09:20.392032][warning][117523][EnumeratorLibusb.cpp:342] Execute failure! A std::exception has occurred!
  - where:342#createUsbDevice
  - msg:failed to open usb device!  error: OB_USB_STATUS_ACCESS
  - type:St13runtime_error
[2023-07-04 17:09:20.392057][warning][117523][EnumeratorLibusb.cpp:342] failed to create usb device at index: 1, url:2-1.4.1-6
[2023-07-04 17:09:20.392072][warning][117523][ObException.hpp:40] usbEnumerator createUsbDevice failed!
Traceback (most recent call last):
  File "depth_viewer.py", line 73, in <module>
    main()
  File "depth_viewer.py", line 34, in main
    device: Device = device_list.get_device_by_index(0)
pyorbbecsdk.OBError: usbEnumerator createUsbDevice failed!
[2023-07-04 17:09:20.403747][info][117523][Context.cpp:81] Context destroyed

Answer: The current device does not have permission to access the device， check the PID of the current device

lsusb | grep 2bc5

Your output should look like this

Bus 002 Device 007: ID 2bc5:your_pid_here

Edit/etc/udev/rules.d/99-obsensor-libusb.rules，add the following line

SUBSYSTEM=="usb", ATTR{idProduct}=="your_pid_here", ATTR{idVendor}=="2bc5", MODE:="0666", OWNER:="root"  GROUP:="video", SYMLINK+="you_device_name_here"

you_device_name_here is the name of the device you want to create, for example Astra.

Then restart the udev service

sudo udevadm control --reload-rules && sudo service udev restart && sudo udevadm trigger