Jetpack 4.5: USB Camera does not work in Cheese and opencv 4.1

[DaneLLL]

Hi,
Please check the sample:

OpenCV Video Capture with GStreamer doesn't work on ROS-melodic

Hi, Once you confirm the source is valid, you may also try this simple code: 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.ims…

and run this pipeline:

 v4l2src device=/dev/video0 ! video/x- raw,format=YUY2,width=640,height=480,framerate=30/1 ! videoconvert ! video/x-raw,format=BGR ! appsink

A user has mentioned performance is better with two nvvidconv plugins:

YUY2 to BGRx failure

Hi, The nvvidconv plugin supports the two kinds of conversions: 1. ... ! video/x-raw ! nvvidconv ! video/x-raw(memory:NVMM) ! ... 2. ... ! video/x-raw(memory:NVMM) ! nvvidconv ! video/x-raw ! ... This case is not supported: ... ! video/x-raw ! nvvidconv ! video/x-raw ! ... You may try this: ... ! video/x-raw ! nvvidconv ! video/x-raw(memory:NVMM) ! nvvidconv ! video/x-raw ! ... However, it copies CPU buffers to NVMM buffers and then copy back to CPU buffers. Not sure if this brings perfor…

So you may also try

 v4l2src device=/dev/video0 ! video/x- raw,format=YUY2,width=640,height=480,framerate=30/1 ! nvvidconv ! video/x-raw(memory:NVMM),format=BGRx ! nvvidconv ! video/x-raw ! videoconvert ! video/x-raw,format=BGR ! appsink