Opencv c Application Not Working With ar0234 sensor (e-con_STURDeCAM25_CUXVR)

[yglovi]

Below is my basic source to open capture state :

VideoCapture cap (“v4l2src device=/dev/video0 num-buffers=1 ! video/x-raw, format=(string)UYVY, width=(int)1920, height=(int)1200 ! appsink”);

if( !cap.isOpened() )
{
        cout<<"Cannot open the camera"<<endl;
        return -1;
} 

Opening in BLOCKING MODE
ArgusV4L2_Open failed: No such file or directory
Opening in BLOCKING MODE
[ WARN:0@0.893] global /home/mt/opencv/modules/videoio/src/cap_gstreamer.cpp (1412) open OpenCV | GStreamer warning: Cannot query video position: status=0, value=-1, duration=-1
Opening in BLOCKING MODE
ArgusV4L2_Open failed: No such file or directory
Opening in BLOCKING MODE
[ WARN:0@1.560] global /home/mt/opencv/modules/videoio/src/cap_gstreamer.cpp (2408) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module v4l2src0 reported: Internal data stream error.
[ WARN:0@1.561] global /home/mt/opencv/modules/videoio/src/cap_gstreamer.cpp (904) startPipeline OpenCV | GStreamer warning: unable to start pipeline
[ WARN:0@1.561] global /home/mt/opencv/modules/videoio/src/cap_gstreamer.cpp (1590) setProperty OpenCV | GStreamer warning: no pipeline
[ WARN:0@1.561] global /home/mt/opencv/modules/videoio/src/cap_gstreamer.cpp (1590) setProperty OpenCV | GStreamer warning: no pipeline
[ WARN:0@1.561] global /home/mt/opencv/modules/videoio/src/cap_gstreamer.cpp (1590) setProperty OpenCV | GStreamer warning: no pipeline
[ WARN:0@1.561] global /home/mt/opencv/modules/videoio/src/cap_gstreamer.cpp (1485) getProperty OpenCV | GStreamer warning: GStreamer: no pipeline
CAM_FPS : 0
Error Received While Reading Frame
terminate called after throwing an instance of ‘cv::Exception’
what(): OpenCV(4.6.0-dev) /home/mt/opencv/modules/imgcodecs/src/loadsave.cpp:763: error: (-215:Assertion failed) !_img.empty() in function ‘imwrite’

Aborted (core dumped)

[DaneLLL]

Hi,
Please try this sample and see if it works:
V4l2src using OpenCV Gstreamer is not working in Jetson Xavier NX - #3 by DaneLLL

[yglovi]

Hi DaneLLL,

I have tried the above step and I am able to open camera now but I am not able to set exposure_absolute_time value.
Everytime I set the value using
v4l2-ctl -d /dev/video0 -c exposure_auto=1
v4l2-ctl -d /dev/video0 -c exposure_time_absolute=100. But when I run opencv application the value goes back to auto_exposure or exposure values Aren’t applied.

Is there way to tune the exposure values from api itself v4l2src… in opencv. I have tried setting exposure from opencv as well but it says unhandled property.

Need help to set the exposure values from opencv application.

[yglovi]

This is output image which is being captured from current settings. Need exposure settings for the same camera with opencv.