How can I unable Gstreamer suport on opencv-python Jetson Orin Nano

[jadali95000]

Hi, I am working on Jetson Orin Nano 8Gb running Jetpack 5.1.2 and I am trying to access my imx219 MIPI CSI camera video feed through the opencv-python library (cv2).

The following pipeline successfully launches my camera in CLI:

gst-launch-1.0 nvarguscamerasrc sensor_id =0 ! 'video/x-raw(memory:NVMM), width=1280  ,height=720 , format=(string)NV12' ! nvvidconv ! nvegltransform ! nveglglessink

I adapted the pipeline to work as an input to the openCV function “VideoCapture()” as follows:

pipeline1 = "nvarguscamerasrc sensor-id=0 ! video/x-raw(memory:NVMM), width=1280 , height=720 , format=(string)NV12 , framerate = 30/1 ! nvvidconv flip-method=2 ! video/x-raw , width=640 , height=360 , format=(string)BGRx ! videoconvert ! video/x-raw , format=(string)BGR ! appsink"

video_capture = cv2.VideoCapture.open(pipeline1,cv2.CAP_ANY)

But this didn’t work. After a while I realized opencv has Gstreamer support disabled by default by running this python code:

import cv2
print(cv2.getBuildInformation())

the output says “[…] Gstreamer = NO […]”
How can I enable Gstreamer support for opencv-python ?

Any help would be greatly appreciated, thank you.

Jad.

[DaneLLL]

Hi,
It seems like you manually update OpenCV package which does not enable gstreamer. If you use the package installed through SDKManager, it should work. We would suggest re-flash the system and install SDK Components through SDKManager. And try again.

You may also try the samples:
[Gstreamer] nvvidconv, BGR as INPUT - #4 by DaneLLL
OpenCV Video Capture with GStreamer doesn't work on ROS-melodic - #3 by DaneLLL

[jadali95000]

Thank you for your response. Just to let you know I am currently running the OS on an SD card and I don’t have any SSD available for installation. Would SDK manager still work in this case? The only other linux device I have available for flashing is a raspberry pi 4.

[DaneLLL]

Hi,
We would suggest have a host PC in Ubutn 18.04 or 20.04. So that you can install SDKMamager on the host and use it to flash Jetson devices.