videocapture error about buildopencvtx2 HOT 4 CLOSED

FYI, I've put together a guide for using gstreamer with OpenCV on the TX2. Just scroll down to the OpenCV section to see how to compile with gstreamer support and some example code.

from buildopencvtx2.

You are trying to access the camera with v4l2 interface, but your camera doesn't provide the expected format for opencv (gray8 or BGR). The onboard camera is a bayer sensor.
You can use gstreamer interface, if you've configured opencv with gstreamer-1.0 support, for making a pipeline that converts into BGR.

from buildopencvtx2.

I had the same error from videoio when using cv::videocapture.
I fixed it by turning on libv4l lib when building opencv.

from buildopencvtx2.

Can you try to run this code?

import numpy as np
import cv2

cap = cv2.VideoCapture("nvcamerasrc ! video/x-raw(memory:NVMM), width=(int)300, height=(int)300,format=(string)I420, framerate=(fraction)20/1 ! nvvidconv flip-method=0 ! video/x-raw, format=(string)BGRx ! videoconvert ! video/x-raw, format=(string)BGR ! appsink")

while(True):
# Capture frame-by-frame
ret, frame = cap.read()

# Our operations on the frame come here
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

# Display the resulting frame
cv2.imshow('frame',gray)
cv2.imshow('fram2',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
    break

cap.release()
cv2.destroyAllWindows()

It worked for me!

from buildopencvtx2.