I’m trying to make a first pass at opening up my webcam and doing some image labelling … I’m trying to test a USB webcam . The webcam is being recognized by lsusb and ls /dev/video* as /video1. I’m trying to follow along this tutorial as well as this one and this one. I’ve been able to install "…

When you want to see the output of the pipeline with gst-launch, you would use a videosink such as xvimagesink for displaying into a X window. For opencv, the sink of the pipeline would be appsink, receiving BGR or GRAY8 frames from standard memory. You may try: # CPU convert cap = cv2.VideoCaptu…

You may try using gstreamer with a pipeline such as this one displaying camera feed to X window (assuming you have X server locally running GUI): gst-launch-1.0 -v v4l2src device=/dev/video1 ! videoconvert ! xvimagesink For further advice, provide the modes this camera gives with: # Install packa…

Thanks. I’ve attached a couple of screen grabs that have the error from: gst-launch-1.0 -v v4l2src device=/dev/video1 ! videoconvert ! xvimagesink and the output of the listed formats. [error_cap1] [error_cap2] Alright … I do have xvfb installed (sudo apt-get install xvfb) … but i’m guessing it…

alright … I did manage to the get xvfb file running … but that didn’t seem to fix things. still researching. I’m still getting the gstreamer error … Gstreamer pipeline have not been created. Failed to open camera

So assuming you have an X display running and DISPLAY set to this, you may check that you can display. The following uses a software video source so that we rule out a display issue before going into camera: gst-launch-1.0 videotestsrc ! xvimagesink If ok, let’s try using the camera. Be sure you p…

Thanks. Some small progress … I think. I was able to run the first command for the software video source. I got what looked like an old TV broadcast test screen. None of the next 3 commands worked. I got this output: New Bitmap Image (4).bmp (621.3 KB) EDIT: Also … on a whim, I tried this pip…

[image] slow_one: I am able to open/stream from my webcam using nvgstcapture-1.0 --cap-dev-node=0 --camsrc=0 I’m a bit confused… What succeeds here uses /dev/video0, while you mentionned video1 previously. If your cam is /dev/video0, you may adjust device property of v4l2src plugin.

welp. i’m an idiot. yes. gst-launch-1.0 -v v4l2src device=/dev/video0 ! image/jpeg, format=MJPG, width=640, height=480, framerate=30/1 ! nvv4l2decoder mjpeg=1 ! nvvidconv ! xvimagesink works … guh. alright. now to figure out why my app isn’t opening things right

[image] slow_one: welp. i’m an idiot. yes. I know this feeling…several times each day. I believe that admitting this is a way for improvement ;-) Let us know if you need more help for your application.

so … trying to get this to run … `import numpy as np import cv2 cap = cv2.VideoCapture("/dev/video1") # check this 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 th…

If you want monochrome frame, you may use a gstreamer pipeline leveraging jetson HW to do so: cap = cv2.VideoCapture("v4l2src device=/dev/video0 ! image/jpeg, format=MJPG, width=640, height=480, framerate=30/1 ! nvv4l2decoder mjpeg=1 ! nvvidconv ! video/x-raw, format=GRAY8 ! appsink drop=1", cv2.CA…

Webcam not opening

Robotics & Edge Computing Jetson Systems Jetson TX2

Honey_Patouceul August 25, 2021, 7:24pm 16

I have no perfect link for starting, but you may check this.

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Webcam not opening

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