I have transplanted the latest opencv-4.8.1 on the STM32MP135F-DK Discovery Board and run a program to capture video stream from a camera on the borad.
I found if I cmake the opencv-4.8.1 source code with "-DWITH_GSTREAMER=ON -DBUILD_GSTREAMER=ON"，and when I am getting the camera data stream in the test program, the gstreamer library on the board reports the following error.
(opencv_camera:2589): GStreamer-CRITICAL **: 19:26:41.671: gst_sample_get_caps: assertion 'GST_IS_SAMPLE (sample)' failed
[ERROR:0@95.876] global cap_gstreamer.cpp:925 retrieveVideoFrame GStreamer: gst_sample_get_caps() returns NULL
Then I cmake the opencv-4.8.1 source code with "-DWITH_GSTREAMER=OFF -DBUILD_GSTREAMER=OFF", the errors are gone and the test program runs normally.
I think it might be that the opencv I compiled is not compatible with the gstreamer library included in the SDK.
Is my understanding right?
the version of the opencv I compiled:
opencv-4.8.1
the version of the gstreamer library included in the SDK:
libgstreamer-1.0.so.0.2200.0
SDK:
en.SDK-x86_64-stm32mp1-openstlinux-6.1-yocto-mickledore-mp1-v23.06.21.tar.gz
My opencv cmake command
cmake -D WITH_IPP=OFF \
-D BUILD_IPP=OFF \
-D WITH_ADE=OFF \
-D BUILD_ADE=OFF \
-D WITH_GSTREAMER=ON \
-D BUILID_GSTREAMER=ON \
-D CMAKE_INSTALL_PREFIX=../install \
..
My test program
#include <iostream>
#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
int main()
{
VideoCapture cap(0);
if (!cap.isOpened())
{
cout << "could not open the camera" << endl;
return -1;
}
namedWindow("camera", WINDOW_AUTOSIZE);
while (true)
{
Mat frame;
cap >> frame;
if (frame.empty())
break;
imshow("camera", frame);
if (waitKey(30) == 'q')
break;
}
cap.release();
destroyAllWindows();
return 0;
}
