Hi,
I'm having some trouble getting the zerocam to work with OpenCV's VideoCapture. Tools such as rpicam-still are working fine. It's worth noting that ffmpeg is also not working.
I'm compiling the C++ stuff on another machine using WSL with a Raspberry Pi OS image, so it should be the same as the Pi that I'm running the code on.
This is the code that I'm using to try get OpenCV to work:And the output of that code:ffmpeg output:Which doesn't seem good. /dev/video0 does exist, and is used by rpicam-still.
If it's of use, this is the command I'm using to compile OpenCV.OpenCV is statically linked in this case so that it does not have to be installed on the Pi to work. (potentially the problem? would not explain why ffmpeg is also not working)
Any help is greatly appreciated!
I'm having some trouble getting the zerocam to work with OpenCV's VideoCapture. Tools such as rpicam-still are working fine. It's worth noting that ffmpeg is also not working.
I'm compiling the C++ stuff on another machine using WSL with a Raspberry Pi OS image, so it should be the same as the Pi that I'm running the code on.
This is the code that I'm using to try get OpenCV to work:
Code:
#include <opencv2/opencv.hpp>#include <iostream>#include <string>#include <ctime>int main() { // Open the default camera with V4L2 backend cv::VideoCapture cap(0, cv::CAP_V4L2); // Check if the camera opened successfully if (!cap.isOpened()) { std::cerr << "Error: Could not open camera." << std::endl; return -1; } // Set camera properties cap.set(cv::CAP_PROP_FRAME_WIDTH, 640); cap.set(cv::CAP_PROP_FRAME_HEIGHT, 480); cap.set(cv::CAP_PROP_FPS, 30); // Print camera properties std::cout << "Frame width: " << cap.get(cv::CAP_PROP_FRAME_WIDTH) << std::endl; std::cout << "Frame height: " << cap.get(cv::CAP_PROP_FRAME_HEIGHT) << std::endl; std::cout << "FPS: " << cap.get(cv::CAP_PROP_FPS) << std::endl; // Skip a few initial frames to allow the camera to adjust for (int i = 0; i < 10; ++i) { cv::Mat temp; cap >> temp; if (temp.empty()) { std::cerr << "Warning: Initial frame " << i << " is empty." << std::endl; } } // Capture a single frame cv::Mat frame; cap >> frame; // Check if the frame is empty if (frame.empty()) { std::cerr << "Error: Blank frame grabbed." << std::endl; return -1; } // Generate a filename with timestamp std::time_t t = std::time(nullptr); std::tm* now = std::localtime(&t); char filename[128]; strftime(filename, sizeof(filename), "capture_%Y%m%d_%H%M%S.jpg", now); // Save the image bool success = cv::imwrite(filename, frame); if (success) { std::cout << "Image saved as '" << filename << "'" << std::endl; } else { std::cerr << "Error: Could not save the image." << std::endl; } // Release the camera cap.release(); return 0;}Code:
jorda@opendashcam:~ $ sudo ./dashcamFrame width: 640Frame height: 480FPS: [ WARN:0@0.015] global cap_v4l.cpp:1938 getProperty VIDEOIO(V4L2:/dev/video0): Unable to get camera FPS-1Warning: Initial frame 0 is empty.Warning: Initial frame 1 is empty.Warning: Initial frame 2 is empty.Warning: Initial frame 3 is empty.Warning: Initial frame 4 is empty.Warning: Initial frame 5 is empty.Warning: Initial frame 6 is empty.Warning: Initial frame 7 is empty.Warning: Initial frame 8 is empty.Warning: Initial frame 9 is empty.Error: Blank frame grabbed. Code:
jorda@opendashcam:~ $ ffmpeg -f video4linux2 -i /dev/video0 -vframes 1 test.jpg ffmpeg version 5.1.5-0+rpt1+deb12u1 Copyright (c) 2000-2024 the FFmpeg developers built with gcc 12 (Debian 12.2.0-14) configuration: --prefix=/usr --extra-version=0+rpt1+deb12u1 --toolchain=hardened --incdir=/usr/include/aarch64-linux-gnu --enable-gpl --disable-stripping --disable-mmal --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sand --enable-sdl2 --disable-sndio --enable-libjxl --enable-neon --enable-v4l2-request --enable-libudev --enable-epoxy --libdir=/usr/lib/aarch64-linux-gnu --arch=arm64 --enable-pocketsphinx --enable-librsvg --enable-libdc1394 --enable-libdrm --enable-vout-drm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libplacebo --enable-librav1e --enable-shared libavutil 57. 28.100 / 57. 28.100 libavcodec 59. 37.100 / 59. 37.100 libavformat 59. 27.100 / 59. 27.100 libavdevice 59. 7.100 / 59. 7.100 libavfilter 8. 44.100 / 8. 44.100 libswscale 6. 7.100 / 6. 7.100 libswresample 4. 7.100 / 4. 7.100 libpostproc 56. 6.100 / 56. 6.100 [video4linux2,v4l2 @ 0x559321d5c0] ioctl(VIDIOC_G_PARM): Inappropriate ioctl for device [video4linux2,v4l2 @ 0x559321d5c0] Time per frame unknown[video4linux2,v4l2 @ 0x559321d5c0] ioctl(VIDIOC_STREAMON): Invalid argument/dev/video0: Invalid argument If it's of use, this is the command I'm using to compile OpenCV.
Code:
cmake -D CMAKE_BUILD_TYPE=RELEASE \ -D CMAKE_INSTALL_PREFIX=/usr/local \ -D BUILD_TESTS=OFF \ -D BUILD_PERF_TESTS=OFF \ -D BUILD_EXAMPLES=OFF \ -D BUILD_opencv_python2=OFF \ -D BUILD_opencv_python3=OFF \ -D BUILD_SHARED_LIBS=OFF \ -D OPENCV_GENERATE_PKGCONFIG=YES \ -D WITH_GTK=ON \ -D WITH_OPENGL=ON \ -D WITH_QT=ON \ -D WITH_V4L=ON \ -D WITH_TBB=OFF \ ..Any help is greatly appreciated!
Statistics: Posted by Zalosath — Sat Jul 27, 2024 5:54 pm