I am trying to build opencv from source to enable GStreamer support. I have followed this instructions here, but an error occurred. More specifically, the error occurred in this step: make -j$(nproc) The overall procedure is this one: sudo apt update sudo apt install -y \ build-essential cmake git pkg-config \ libjpeg-dev libtiff-dev libpng-dev \ libavcodec-dev libavformat-dev libswscale-dev \ libv4l-dev libxvidcore-dev libx264-dev \ libgtk-3-dev libatlas-base-dev gfortran \ python3-dev python3-numpy \ libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev cd ~ git clone https://github.com/opencv/opencv.git git clone https://github.com/opencv/opencv_contrib.git cd opencv git checkout 3.4.18 # I used this version because I had the same one working in venv on a pip version cd ../opencv_contrib git checkout 3.4.18 cd ~/opencv mkdir build cd build cmake -D CMAKE_BUILD_TYPE=RELEASE \ -D CMAKE_INSTALL_PREFIX=/usr/local \ -D WITH_GSTREAMER=ON \ -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \ -D PYTHON3_EXECUTABLE=$(which python3) \ -D BUILD_opencv_python3=ON \ -D BUILD_EXAMPLES=OFF .. make -j$(nproc) # <- this is where the error is thrown sudo make install sudo ldconfig The error is this one: [ 43%] Building CXX object modules/dnn/CMakeFiles/opencv_dnn.dir/layers/layers_common.avx2.cpp.o [ 43%] Building CXX object modules/dnn/CMakeFiles/opencv_dnn.dir/layers/layers_common.avx512_skx.cpp.o [ 44%] Linking CXX shared library ../../lib/libopencv_dnn.so [ 44%] Built target opencv_dnn [ 44%] Linking CXX shared library ../../lib/libopencv_features2d.so [ 44%] Built target opencv_features2d make: *** [Makefile:166: all] Error 2 and as I understand it there is an issue with libopencv_features2d.so library. Inside the build folder there is a lib subfolder which contains libopencv_features2d.so (it is a symlinc to libopencv_features2d.so.3.4.18 in reality). I tried to apply some flags to the CMake to give more information and to my surprise the process seemed to move forward. I am not sure if it actually fixed the error or just moved on but it reached a point where it doesn't get any better. [ 44%] Built target opencv_dnn [ 44%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_ffmpeg.cpp.o [ 46%] Built target opencv_calib3d [ 46%] Built target opencv_text [ 46%] Built target opencv_stereo [ 46%] Built target opencv_structured_light [ 47%] Built target opencv_rgbd [ 48%] Built target opencv_objdetect [ 49%] Built target opencv_aruco [ 50%] Built target opencv_xfeatures2d [ 50%] Built target opencv_bgsegm [ 52%] Built target opencv_ximgproc [ 53%] Built target opencv_xobjdetect [ 54%] Built target opencv_face [ 56%] Built target opencv_datasets [ 57%] Built target opencv_stitching [ 58%] Built target opencv_optflow [ 61%] Built target opencv_tracking In file included from /home/gorfanidis/Downloads/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:79, from /home/gorfanidis/Downloads/opencv/modules/videoio/src/cap_ffmpeg.cpp:49: /home/gorfanidis/Downloads/opencv/modules/videoio/src/ffmpeg_codecs.hpp:80:6: warning: "LIBAVCODEC_VERSION_INT" is not defined, evaluates to 0 [-Wundef] 80 | #if (LIBAVCODEC_VERSION_INT <= AV_VERSION_INT(54, 51, 100)) | ^~~~~~~~~~~~~~~~~~~~~~ /home/gorfanidis/Downloads/opencv/modules/videoio/src/ffmpeg_codecs.hpp:270:5: warning: "LIBAVCODEC_VERSION_INT" is not defined, evaluates to 0 [-Wundef] 270 | #if LIBAVCODEC_VERSION_INT>0x000409 | ^~~~~~~~~~~~~~~~~~~~~~ /home/gorfanidis/Downloads/opencv/modules/videoio/src/ffmpeg_codecs.hpp:277:5: warning: "LIBAVCODEC_VERSION_INT" is not defined, evaluates to 0 [-Wundef] 277 | #if LIBAVCODEC_VERSION_INT>((50<<16)+(1<<8)+0) | ^~~~~~~~~~~~~~~~~~~~~~ /home/gorfanidis/Downloads/opencv/modules/videoio/src/ffmpeg_codecs.hpp:286:5: warning: "LIBAVCODEC_VERSION_INT" is not defined, evaluates to 0 [-Wundef] 286 | #if LIBAVCODEC_VERSION_INT>((51<<16)+(11<<8)+0) | ^~~~~~~~~~~~~~~~~~~~~~ /home/gorfanidis/Downloads/opencv/modules/videoio/src/ffmpeg_codecs.hpp:295:5: warning: "LIBAVCODEC_VERSION_INT" is not defined, evaluates to 0 [-Wundef] 295 | #if LIBAVCODEC_VERSION_INT>=((51<<16)+(49<<8)+0) | ^~~~~~~~~~~~~~~~~~~~~~ /home/gorfanidis/Downloads/opencv/modules/videoio/src/ffmpeg_codecs.hpp:81:26: error: ‘CODEC_ID_H264’ was not declared in this scope; did you mean ‘AV_CODEC_ID_H264’? 81 | #define AV_CODEC_ID_H264 CODEC_ID_H264 | ^~~~~~~~~~~~~ /home/gorfanidis/Downloads/opencv/modules/videoio/src/ffmpeg_codecs.hpp:146:7: note: in expansion of macro ‘AV_CODEC_ID_H264’ 146 | { AV_CODEC_ID_H264, MKTAG('H', '2', '6', '4') }, | ^~~~~~~~~~~~~~~~ /home/gorfanidis/Downloads/opencv/modules/videoio/src/ffmpeg_codecs.hpp:81:26: error: ‘CODEC_ID_H264’ was not declared in this scope; did you mean ‘AV_CODEC_ID_H264’? 81 | #define AV_CODEC_ID_H264 CODEC_ID_H264 | ^~~~~~~~~~~~~ /home/gorfanidis/Downloads/opencv/modules/videoio/src/ffmpeg_codecs.hpp:147:7: note: in expansion of macro ‘AV_CODEC_ID_H264’ 147 | { AV_CODEC_ID_H264, MKTAG('h', '2', '6', '4') }, | ^~~~~~~~~~~~~~~~ /home/gorfanidis/Downloads/opencv/modules/videoio/src/ffmpeg_codecs.hpp:81:26: error: ‘CODEC_ID_H264’ was not declared in this scope; did you mean ‘AV_CODEC_ID_H264’? 81 | #define AV_CODEC_ID_H264 CODEC_ID_H264 | ^~~~~~~~~~~~~ /home/gorfanidis/Downloads/opencv/modules/videoio/src/ffmpeg_codecs.hpp:148:7: note: in expansion of macro ‘AV_CODEC_ID_H264’ 148 | { AV_CODEC_ID_H264, MKTAG('X', '2', '6', '4') }, | ^~~~~~~~~~~~~~~~ /home/gorfanidis/Downloads/opencv/modules/videoio/src/ffmpeg_codecs.hpp:81:26: error: ‘CODEC_ID_H264’ was not declared in this scope; did you mean ‘AV_CODEC_ID_H264’? 81 | #define AV_CODEC_ID_H264 CODEC_ID_H264 | ^~~~~~~~~~~~~ /home/gorfanidis/Downloads/opencv/modules/videoio/src/ffmpeg_codecs.hpp:149:7: note: in expansion of macro ‘AV_CODEC_ID_H264’ 149 | { AV_CODEC_ID_H264, MKTAG('x', '2', '6', '4') }, | ^~~~~~~~~~~~~~~~ /home/gorfanidis/Downloads/opencv/modules/videoio/src/ffmpeg_codecs.hpp:81:26: error: ‘CODEC_ID_H264’ was not declared in this scope; did you mean ‘AV_CODEC_ID_H264’? 81 | #define AV_CODEC_ID_H264 CODEC_ID_H264 ... After that there is large display of similar messages. So, is there any action I could take to resolve the issue? Do I need to update any path variable for example? Continue reading...
