Opencv problem with capturing rtsp stream using gstreamer on jetson nano

Autonomous Machines Jetson & Embedded Systems Jetson Nano
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1

I having some problem to run my openalpr python code with a logitech camera.
My code as below:
openalpr_camera.txt (1.8 KB)
I run the code, the result was like this:

[ WARN:0] global /home/nvidia/host/build_opencv/nv_opencv/modules/videoio/src/cap_gstreamer.cpp (1757) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module rtspsrc0 reported: Could not open resource for reading and writing.
[ WARN:0] global /home/nvidia/host/build_opencv/nv_opencv/modules/videoio/src/cap_gstreamer.cpp (886) open OpenCV | GStreamer warning: unable to start pipeline
[ WARN:0] global /home/nvidia/host/build_opencv/nv_opencv/modules/videoio/src/cap_gstreamer.cpp (480) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
Traceback (most recent call last):
File “openalpr_camera.py”, line 67, in
main()
File “openalpr_camera.py”, line 37, in main
sys.exit(‘Failed to open video file!’)
NameError: global name ‘sys’ is not defined

But it was fine to open the camera with:

gst-launch-1.0 -v v4l2src device=/dev/video0 ! jpegdec ! video/x-raw,framerate=30/1,width=1280,height=720 ! videoconvert ! xvimagesink

How can I make the camera work on my code? Thank you!

3

Hi,
In the code, the camera is v4l2 source and it is opened as RTSP source. You can modfify it byreferring to this sample:
Sony camera module cannot be opened with OpenCV on Xavier - #5 by DaneLLL

4

thank you very much, Now my program work with an usb camera.