Gstreamer error; not able to run videocapture

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

Hi team

I am trying to capture a video using logitech c270 camera in jetson tx2(JP 4.6.4). but I am facing the below error.

Python 3.6.9 (default, Mar 10 2023, 16:46:00)
[GCC 8.4.0] on linux
Type “help”, “copyright”, “credits” or “license” for more information.

import cv2
cv2.VideoCapture(1)
[ WARN:0] global /home/nvidia/host/build_opencv/nv_opencv/modules/videoio/src/cap_gstreamer.cpp (933) open OpenCV | GStreamer warning: Cannot query video position: status=0, value=-1, duration=-1
<VideoCapture 0x7f8e2e8650>

Kindly help me to resolve this issue

I also referred the below link but issue remains the same.
https://forums.developer.nvidia.com/t/logitech-c930e-on-jetson-tx1-very-slow-and-choppy-video/78411/2

3

Hi,
Please check the steps in Jetson Nano FAQ

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

to launch USB camera.

4

Hi @DaneLLL

Thanks, I will work and get back to you

5

Hi @DaneLLL

$ gst-launch-1.0 v4l2src device=/dev/video1 ! video/x-raw,format=YUY2,width=640,height=480,framerate=30/1 ! nvvidconv ! 'video/x-raw(memory:NVMM),format=NV12' ! nvoverlaysink

I was able to run the above command succesfully.

but the error persist with the same error(mentioned in the 1st cell of this thread).

6

Hi,
You may try this python sample:
V4l2src using OpenCV Gstreamer is not working in Jetson Xavier NX - #3 by DaneLLL

If it does not work, it seems like you don’t use the OpenCV package installed through SDKManager.

For information, please share which Jetpack version you are using.

7

I am using jetpack version 4.6.4

8

Hi,
Please change width, height, frame rate, format in the sample according to your camera source. If the python sample can not be successfully run, you may re-flash system image and SDK components through SDKManager. And try again.

10

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