Build OpenCV with FFmpeg Bug don't work VideoCapture For RTSP URL

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
1

HI.

I use following cmake options for building for Opencv.

cmake CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr -DOPENCV_EXTRA_MODULES_PATH=…/…/opencv_contrib-4.4.0/modules -DWITH_CUDA=ON -DCUDA_FAST_MATH=1 -DBUILD_EXAMPLES=ON -DCUDA_ARCH_BIN=“5.3” -DCUDA_ARCH_PTX=“” -DBUILD_TESTS=OFF -DBUILD_PERF_TESTS=OFF -D OPENCV_GENERATE_PKGCONFIG=ON -DBUILD_EXAMPLES=OFF -DBUILD_opencv_python2=OFF -DBUILD_opencv_python3=OFF -DWITH_FFMPEG=ON …

But I can’t see “FFMPEG: YES” in cmake result.

– Video I/O:
– DC1394: NO
– FFMPEG: NO
– avcodec: YES (57.107.100)
– avformat: YES (57.83.100)
– avutil: YES (55.78.100)
– swscale: YES (4.8.100)
– avresample: YES (3.7.0)
– GStreamer: YES (1.14.5)
– v4l/v4l2: YES (linux/videodev2.h)

I run test code then Stop here and don’t result images from RTSP URL.
How can I fix this problem.

Opening in BLOCKING MODE
NvMMLiteOpen : Block : BlockType = 261
NVMEDIA: Reading vendor.tegra.display-size : status: 6
NvMMLiteBlockCreate : Block : BlockType = 261

#include <opencv2/opencv.hpp>

int main()
{
cv::Mat frame;
cv::VideoCapture cap(“rtsp://admin:admin@192.168.1.80:554/onvif/profile5/media.smp”);

while(1) 
{
	cap.read(frame);
    if (frame.empty())
        printf("error\n");

 	cv::imshow("result", frame);
	cv::waitKey(1);
}

}

I installed ffmpeg like this, could it be a problem?

Accelerated Decode with ffmpeg
https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/multimedia.html#wwpID0E0JB0HA

3

Hi,
We don’t try the case of enabling ffmpeg in OpenCV. In general, we run gstreamer pipeline to utilize hardware decoding. Please refer to
Doesn't work nvv4l2decoder for decoding RTSP in gstreamer + opencv - #3 by DaneLLL
See if you can run this sample and do development based on it.

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