Hi, Hi this refers to Jetson Xavier NX (Dev Kit Version) jetpack V4.5 cheese V.3.28.0 (cheese -v) opencv 4.1.1 (cv.–version) gstreamer 1.14.5 (output from gst-inspect) after a fresh install on my Xavier NX using jetpack 4.5 “cheese (V 3.28.0)” and opencv do not recognize my USB Cam. Cheese…

Hi, Please apply this and try again: Jetson/L4T/r32.5.x patches - eLinux.org [camera] 3rdparty application fails to open with USB camera

Thank you for reply.I did: sudo apt install v4l-utils installed … v4l2-ctl -d /dev/video0 --list-formats-ext ioctl: VIDIOC_ENUM_FMT Index : 0 Type : Video Capture Pixel Format: ‘YUYV’ Name : YUYV 4:2:2 Size: Discrete 640x480 (had to use video0, there is no video1) Wenn…

Hi, Setting YUY2 in gstreamer command is correct. do you see video preview? Or may try to save to a video file and check if it is playable: gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=150 ! video/x-raw,format=YUY2,width=640,height=480,framerate=30/1 ! nvvidconv ! ‘video/x-raw(memory:NVM…

Hi back, thanks for reply, here it is late night …, i shall continue tomorrow your suggestion leads to an error. the cam switches on for a second than (streaming )stops, no preview: …marius@xavier-nx:~$ gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=150 ! video/x- raw,format=YUY2,width=…

Hi, For setting num-buffers=150, it terminates after capturing 150 frames. Looks like it works. So the recorded a.mp4 is invalid?

so hi good morning from here, yes, I got the desired a.mp4 file. viewable/valid too, plays in default videoplayer -great!! But cheese does not work any more? - and how to open the stream in open cv? thank you for your great help. Marius

Hi, Please check the sample: [image] OpenCV Video Capture with GStreamer doesn't work on ROS-melodic Jetson TX2 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("nvarguscameras…

thank you ok, I shall try your suggestions. in the meantime I found out I can get at least an output of the webcam on screen by either commands: gst-launch-1.0 autovideosrc ! xvimagesink gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-raw,width=1280,height=720 ! xvimagesink probably still…

Thank you @mebc for asking about this, I am running into the same issues.

Hi, Not sure why cheese app does not work. We would suggest use gstreamer or jetson_multimedia_api on Jetson platforms. The two frameworks are tested/verified in each L4T release. Should be with better stability.

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

Robotics & Edge Computing Jetson Systems Jetson Xavier NX

DaneLLL January 27, 2021, 8:49am 3

Hi,
Could you check if you can launch the camera in gstreamer pipeline? Please follow steps in

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

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

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