I need some help with the USB Camera and Nvidia Jetson

Autonomous Machines Jetson & Embedded Systems Jetson Nano
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1

running
ls -ltrh /dev/video* gives the output
crw-rw---- 1 root video 81, 0 Dec 6 06:49 /dev/video0, so I think system sees the camera, but I get an error `---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
Cell In[1], line 1
----> 1 import cv2
2 cam = cv2.VideoCapture(0)
3 ret, frame = cam.read()

File /usr/local/lib/python3.10/dist-packages/cv2/init.py:181
176 if DEBUG: print(“Extra Python code for”, submodule, “is loaded”)
178 if DEBUG: print(‘OpenCV loader: DONE’)
→ 181 bootstrap()

File /usr/local/lib/python3.10/dist-packages/cv2/init.py:153, in bootstrap()
149 if DEBUG: print(“Relink everything from native cv2 module to cv2 package”)
151 py_module = sys.modules.pop(“cv2”)
→ 153 native_module = importlib.import_module(“cv2”)
155 sys.modules[“cv2”] = py_module
156 setattr(py_module, “_native”, native_module)

File /usr/lib/python3.10/importlib/init.py:126, in import_module(name, package)
124 break
125 level += 1
→ 126 return _bootstrap._gcd_import(name[level:], package, level)

ImportError: libnvrm.so: cannot open shared object file: No such file or directory`
I need some help, I’ve never asked any questions on any forums before, so if more information is needed, please ask me.

3

Hi,
Please follow the guidance to check if the camera can be successfully launched:

Jetson Nano FAQ
Q: I have a USB camera. How can I launch it on Jetson Nano?

If yes, please apply the same pipeline to the python sample:
V4l2src using OpenCV Gstreamer is not working in Jetson Xavier NX - #3 by DaneLLL

1 Like
4

I managed to start the camera using the guidance, but in the Python code, using the linked code in the pipeline, I got this error

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
Cell In[6], line 2
      1 import sys
----> 2 import cv2
      4 def read_cam():
      5     cap = cv2.VideoCapture("v4l2src device=/dev/video0 ! video/x-raw, width=640, height=480 ! videoconvert ! video/x-raw,format=BGR ! appsink")

ImportError: libnvrm.so: cannot open shared object file: No such file or directory

what should I do now?

5

Hi,
Please share which Jetpack release you are using. It is supposed to work if you use the OpenCV package installed through SDKManager.

6 
Software part of jetson-stats 4.2.3 - (c) 2023, Raffaello Bonghi
Model: NVIDIA Jetson Nano Developer Kit - Jetpack 4.6.1 [L4T 32.7.1]
NV Power Mode[0]: MAXN
Serial Number: [XXX Show with: jetson_release -s XXX]
Hardware:
 - P-Number: p3448-0000
 - Module: NVIDIA Jetson Nano (4 GB ram)
Platform:
 - Distribution: Ubuntu 18.04 Bionic Beaver
 - Release: 4.9.253-tegra
jtop:
 - Version: 4.2.3
 - Service: Inactive
Libraries:
 - CUDA: 10.2.300
 - cuDNN: 8.2.1.32
 - TensorRT: 8.2.1.8
 - VPI: 1.2.3
 - Vulkan: 1.2.70
 - OpenCV: 4.1.1 - with CUDA: NO
7

Hi,
You may try to run the sample through python 2.7 instead of 3.10. See if it works with old python version.

8

how can I do that, from kernel selections, no other choice apart from python3 is available.

9

Hi,
You can run

$ python2 --version

If it is installed, you can then use python2 to launch the sample for a try. See if it works.

10

no, unfortunately, it is not

11

Hi,
Your system seems to be in unknown status. Would suggest re-flash the developer kit through SDKManager. It should be running fine on a clean system.