Jetson Orinn Nano CSI camera unable to open camera

When I run in terminal, I can open csi camera.
gst-launch-1.0 nvarguscamerasrc sensor_id=0 !
‘video/x-raw(memory:NVMM),width=1920, height=1080, framerate=30/1’ !
nvvidconv flip-method=0 ! ‘video/x-raw,width=960, height=540’ !
nvvidconv ! nvegltransform ! nveglglessink -e

However, when I run csi python file, it shows “nvarguscamerasrc sensor-id=0 ! video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080, framerate=(fraction)30/1 ! nvvidconv flip-method=0 ! video/x-raw, width=(int)960, height=(int)540, format=(string)BGRx ! videoconvert ! video/x-raw, format=(string)BGR ! appsink drop=1
Error: Unable to open camera”.
Code is

MIT License

Copyright (c) 2019-2022 JetsonHacks

Using a CSI camera (such as the Raspberry Pi Version 2) connected to a

NVIDIA Jetson Nano Developer Kit using OpenCV

Drivers for the camera and OpenCV are included in the base image

import cv2

“”"
gstreamer_pipeline returns a GStreamer pipeline for capturing from the CSI camera
Flip the image by setting the flip_method (most common values: 0 and 2)
display_width and display_height determine the size of each camera pane in the window on the screen
Default 1920x1080 displayd in a 1/4 size window
“”"

def gstreamer_pipeline(
sensor_id=0,
capture_width=1920,
capture_height=1080,
display_width=960,
display_height=540,
framerate=30,
flip_method=0,
):
return (
"nvarguscamerasrc sensor-id=%d ! "
"video/x-raw(memory:NVMM), width=(int)%d, height=(int)%d, framerate=(fraction)%d/1 ! "
"nvvidconv flip-method=%d ! "
"video/x-raw, width=(int)%d, height=(int)%d, format=(string)BGRx ! "
"videoconvert ! "
“video/x-raw, format=(string)BGR ! appsink drop=1”
% (
sensor_id,
capture_width,
capture_height,
framerate,
flip_method,
display_width,
display_height,
)
)

def show_camera():
window_title = “CSI Camera”

# To flip the image, modify the flip_method parameter (0 and 2 are the most common)
print(gstreamer_pipeline(flip_method=0))
video_capture = cv2.VideoCapture(gstreamer_pipeline(flip_method=0), cv2.CAP_GSTREAMER)
if video_capture.isOpened():
    try:
        window_handle = cv2.namedWindow(window_title, cv2.WINDOW_AUTOSIZE)
        while True:
            ret_val, frame = video_capture.read()
            # Check to see if the user closed the window
            # Under GTK+ (Jetson Default), WND_PROP_VISIBLE does not work correctly. Under Qt it does
            # GTK - Substitute WND_PROP_AUTOSIZE to detect if window has been closed by user
            if cv2.getWindowProperty(window_title, cv2.WND_PROP_AUTOSIZE) >= 0:
                cv2.imshow(window_title, frame)
            else:
                break 
            keyCode = cv2.waitKey(10) & 0xFF
            # Stop the program on the ESC key or 'q'
            if keyCode == 27 or keyCode == ord('q'):
                break
    finally:
        video_capture.release()
        cv2.destroyAllWindows()
else:
    print("Error: Unable to open camera")

if name == “main”:
show_camera()

How can I fix it?

Hi,
Please try the sample and see if it works:
OpenCV Video Capture with GStreamer doesn't work on ROS-melodic - #3 by DaneLLL

I already did it. But until I can’t open my csi camera.
import sys
import cv2

def read_cam():
cap = cv2.VideoCapture(“nvarguscamerasrc ! video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080,format=(string)NV12, framerate=(fraction)30/1 ! nvvidconv ! video/x-raw, format=(string)BGRx ! videoconvert ! appsink”)
if cap.isOpened():
cv2.namedWindow(“demo”, cv2.WINDOW_AUTOSIZE)
while True:
ret_val, img = cap.read();
cv2.imshow(‘demo’,img)
cv2.waitKey(10)
else:
print (“camera open failed”)

cv2.destroyAllWindows()

if name == ‘main’:
read_cam()

It shows camera open failed message

I was able to solve this issues by referring to Not able to get CSI camera feed into opencv-python - #14 by WayneWWW

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