Compiling Opencv with Gstreamer, cmake not finding GStreamer - opencv

I want to build opencv with GStreamer support.
I built the GStreamer from source (version 1.8.1) following this guide:
http://kacianka.at/?p=145
I have 'gstreamer_build' folder at my home directory and it contains 'bin' folder with these:
gst-device-monitor-1.0
gst-discoverer-1.0 gst-inspect-1.0
gst-launch-1.0 gst-play-1.0
gst-stats-1.0 gst-typefind-1.0
orc-bugreport orcc
I have this path added to my environment variable PATH.
When I use cmake like:
cmake -D CMAKE_BUILD_TYPE=RELEASE -D
CMAKE_INSTALL_PREFIX=/usr/local -D
OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules -D BUILD_opencv_python3=ON -D WITH_GSTREAMER=ON -D WITH_FFMPEG=OFF
..
I get the following output clearly indicating that gstreamer is not found:
-- checking for module 'gstreamer-base-1.0'
-- package 'gstreamer-base-1.0' not found
-- checking for module 'gstreamer-video-1.0'
-- package 'gstreamer-video-1.0' not found
-- checking for module 'gstreamer-app-1.0'
-- package 'gstreamer-app-1.0' not found
-- checking for module 'gstreamer-riff-1.0'
-- package 'gstreamer-riff-1.0' not found
-- checking for module 'gstreamer-pbutils-1.0'
-- package 'gstreamer-pbutils-1.0' not found
-- checking for module 'gstreamer-base-0.10'
-- package 'gstreamer-base-0.10' not found
-- checking for module 'gstreamer-video-0.10'
-- package 'gstreamer-video-0.10' not found
-- checking for module 'gstreamer-app-0.10'
-- package 'gstreamer-app-0.10' not found
-- checking for module 'gstreamer-riff-0.10'
-- package 'gstreamer-riff-0.10' not found
-- checking for module 'gstreamer-pbutils-0.10'
-- package 'gstreamer-pbutils-0.10' not found
and this:
Video I/O:
-- DC1394 1.x: NO
-- DC1394 2.x: NO
-- FFMPEG: NO
-- codec: NO
-- format: NO
-- util: NO
-- swscale: NO
-- resample: NO
-- gentoo-style: NO
-- GStreamer: NO
-- OpenNI: NO
-- OpenNI PrimeSensor Modules: NO
-- OpenNI2: NO
-- PvAPI: NO
-- GigEVisionSDK: NO
-- UniCap: NO
-- UniCap ucil: NO
-- V4L/V4L2: Using libv4l1 (ver 1.0.1) / libv4l2 (ver 1.0.1)
-- XIMEA: NO
-- Xine: NO
-- gPhoto2: NO
Can anyone help me with this?

I had the same problem.
gstreamer-base corresponds to libgstbase-1.0.so (or libgstbase-0.10.so), found in package libgstreamer1.0-0 (or libgstreamer0.10-0, as the case may be). Below, we install the '-dev' package.
The other libraries (libgst-video, libgst-app, libgst-riff, libgst-pbutils) I found in package libgstreamer-plugins-base1.0-dev (again, substitute the version you wish to use, either v0.1, or v1.0).
Therefore, the following command should be used to install the missing dependencies:
sudo apt install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev
Repeat the cmake command, possibly purging the contents of the build directory beforehand.

The below worked for me if you are developing just a Gstreamer applicaiton
# GStreamer CMake building
cmake_minimum_required(VERSION 3.3)
project(GStreamerHello)
set(PKG_CONFIG_USE_CMAKE_PREFIX_PATH ON)
find_package(PkgConfig REQUIRED)
if ( NOT (PKGCONFIG_FOUND))
message(FATAL_ERROR "Please Install PPkgConfig: CMake will Exit")
endif()
pkg_check_modules(GST REQUIRED gstreamer-1.0>=1.8)
if ( NOT (GST_FOUND))
message(FATAL_ERROR "Please Install Gstreamer Dev: CMake will Exit")
endif()
set(ENV{PKG_CONFIG_PATH})
include_directories("${GST_INCLUDE_DIRS}")
link_libraries(${GST_LIBRARIES})
add_executable(gstreamerSrvc src/hello_gstreamer.cc)
add_dependencies(gstreamerSrvc vsphere_header )
target_link_libraries(gstreamerSrvc ${GST_LIBRARIES} )
Note - If you need a dev docker for GStreamer it is below; and for your question it has the parts of compiling with OpenCV as well;
More details at https://medium.com/techlogs/compiling-opencv-for-cuda-for-yolo-and-other-cnn-libraries-9ce427c00ff8
FROM nvidia/cuda
# This is a dev image, needed to compile OpenCV with CUDA
# Install Gstreamer and OpenCV Pre-requisite libs
RUN apt-get update -y && apt-get install -y \
libgstreamer1.0-0 \
gstreamer1.0-plugins-base \
gstreamer1.0-plugins-good \
gstreamer1.0-plugins-bad \
gstreamer1.0-plugins-ugly \
gstreamer1.0-libav \
gstreamer1.0-doc \
gstreamer1.0-tools \
libgstreamer1.0-dev \
libgstreamer-plugins-base1.0-dev
RUN apt-get update -y && apt-get install -y pkg-config \
zlib1g-dev libwebp-dev \
libtbb2 libtbb-dev \
libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev \
cmake
RUN apt-get install -y \
autoconf \
autotools-dev \
build-essential \
gcc \
git
ENV OPENCV_RELEASE_TAG 3.4.5
RUN git clone https://github.com/opencv/opencv.git /var/local/git/opencv
RUN cd /var/local/git/opencv && \
git checkout tags/${OPENCV_RELEASE_TAG}
RUN mkdir -p /var/local/git/opencv/build && \
cd /var/local/git/opencv/build $$ && \
cmake -D CMAKE_BUILD_TYPE=Release -D BUILD_PNG=OFF -D \
BUILD_TIFF=OFF -D BUILD_TBB=OFF -D BUILD_JPEG=ON \
-D BUILD_JASPER=OFF -D BUILD_ZLIB=ON -D BUILD_EXAMPLES=OFF \
-D BUILD_opencv_java=OFF -D BUILD_opencv_python2=ON \
-D BUILD_opencv_python3=OFF -D ENABLE_NEON=OFF -D WITH_OPENCL=OFF \
-D WITH_OPENMP=OFF -D WITH_FFMPEG=OFF -D WITH_GSTREAMER=ON -D WITH_GSTREAMER_0_10=OFF \
-D WITH_CUDA=ON -D CUDA_TOOLKIT_ROOT_DIR=/usr/local/cuda/ -D WITH_GTK=ON \
-D WITH_VTK=OFF -D WITH_TBB=ON -D WITH_1394=OFF -D WITH_OPENEXR=OFF \
-D CUDA_ARCH_BIN=6.0 6.1 7.0 -D CUDA_ARCH_PTX="" -D INSTALL_C_EXAMPLES=OFF -D INSTALL_TESTS=OFF ..
RUN cd /var/local/git/opencv/build && \
make install
# Install other tools you need for development

On Windows there is no "sudo apt install..." I also had all the paths set right in my PATH environment variable, and still had the same problem. I've got this working after setting following CMake Options:
only set "WITH_GSTREAMER" option to True, "WITH_GSTREAMER_0_10" MUST BE FALSE
add new entry "GSTREAMER_DIR"=(path to gstreamer)
for me it was "C:/gstreamer/1.0/x86_64"
I found this solution here
My OpenCV version: 3.4.3

Adding new entry "GSTREAMER_DIR"=(path to gstreamer) worked for me (WITH_GSTREAMER true). Did not have a WITH_GSTREAMER_0_10 in my version.

Related

Bulid opencv4 on Jetson Xavier nx but failed

I'm trying to implentment openpilot on Jetson Xavier nx. So I'm following https://github.com/eFiniLan/xnxpilot instruction to install dependence.
But when I'm installing opencv4, I get the following errors in ".../opencv/build/CMakeFiles/CMakeError.log"
CMakeFiles/cmTC_ee78d.dir/CheckIncludeFile.c.o -c /home/tshu/opencv/build/CMakeFiles/CMakeTmp/CheckIncludeFile.c
/home/tshu/opencv/build/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:10: fatal error: sys/videoio.h: No such file or directory
#include <sys/videoio.h>
^~~~~~~~~~~~~~~
compilation terminated.
CMakeFiles/cmTC_ee78d.dir/build.make:65: recipe for target ‘CMakeFiles/cmTC_ee78d.dir/CheckIncludeFile.c.o’ failed
make[1]: * [CMakeFiles/cmTC_ee78d.dir/CheckIncludeFile.c.o] Error 1
make[1]: Leaving directory ‘/home/tshu/opencv/build/CMakeFiles/CMakeTmp’
Makefile:126: recipe for target ‘cmTC_ee78d/fast’ failed
make: * [cmTC_ee78d/fast] Error 2
The build command I used is
cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D WITH_CUDA=ON \
-D CUDA_ARCH_PTX="" \
-D CUDA_ARCH_BIN="7.2" \
-D WITH_CUDNN=ON \
-D CUDNN_VERSION="8.0" \
-D BUILD_opencv_python3=ON \
-D BUILD_opencv_python2=OFF \
-D BUILD_opencv_java=OFF \
-D WITH_GSTREAMER=ON \
-D WITH_GTK=OFF \
-D BUILD_TESTS=OFF \
-D BUILD_PERF_TESTS=OFF \
-D BUILD_EXAMPLES=OFF \
-D BUILD_FFMPEG=ON \
-D OPENCV_DNN_CUDA=ON \
-D ENABLE_FAST_MATH=ON \
-D CUDA_FAST_MATH=ON \
-D WITH_QT=ON \
-D ENABLE_NEON=ON \
-D ENABLE_VFPV3=ON \
-D BUILD_TESTS=OFF \
-D INSTALL_PYTHON_EXAMPLES=OFF \
-D INSTALL_C_EXAMPLES=OFF \
-D OPENCV_ENABLE_NONFREE=ON \
-D OPENCV_GENERATE_PKGCONFIG=ON \
-D PYTHON_EXECUTABLE=/home/`whoami`/.pyenv/versions/3.8.5/bin/python \
-D PYTHON_DEFAULT_EXECUTABLE=/home/`whoami`/.pyenv/versions/3.8.5/bin/python \
-D PYTHON_PACKAGES_PATH=/home/`whoami`/.pyenv/versions/3.8.5/lib/python3.8/site-packages/ \
-D OPENCV_EXTRA_MODULES_PATH=/home/`whoami`/opencv_contrib/modules ..
The version of opencv I tried to install is opencv-4.5.2
Can someone give me some advices? Thank you.
Jetpack comes with opencv preinstalled. JetPack 4.4 includes OpenCV 4.1.1. JetPack 4.6 includes OpenCV 4.1.1.
Let me look at the link you sent and I get back to you. You may need to install and compile OpenCV 4.5.2 from source. I wrote some instructions a while a go.
What Jetpack version are you using? OPENCV 4.4, is CUDA GPU accelerated. Using version 4.4 or higher to fully use the Super Resolution function provided by OpenCV. If you are using Jetpack 4.4, you will need to delete the OpenCV 4.1.1 version of JetPack 4.4 and install 4.4 newly.
Try this script file:
#!/bin/bash
#
# Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
#
# NVIDIA Corporation and its licensors retain all intellectual property
# and proprietary rights in and to this software, related documentation
# and any modifications thereto. Any use, reproduction, disclosure or
# distribution of this software and related documentation without an express
# license agreement from NVIDIA Corporation is strictly prohibited.
#
if [ "$#" -ne 1 ]; then
echo "Usage: $0 <Install Folder>"
exit
fi
folder="$1"
user="nvidia"
passwd="nvidia"
echo "** Remove OpenCV4.1 first"
sudo apt-get purge *libopencv*
echo "** Install requirement"
sudo apt-get update
sudo apt-get install -y build-essential cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
sudo apt-get install -y libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev
sudo apt-get install -y python2.7-dev python3.6-dev python-dev python-numpy python3-numpy
sudo apt-get install -y libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev
sudo apt-get install -y libv4l-dev v4l-utils qv4l2 v4l2ucp
sudo apt-get install -y curl
sudo apt-get update
echo "** Download opencv-4.5.1"
cd $folder
curl -L https://github.com/opencv/opencv/archive/4.5.1.zip -o opencv-4.5.1.zip
curl -L https://github.com/opencv/opencv_contrib/archive/4.5.1.zip -o opencv_contrib-4.5.1.zip
unzip opencv-4.5.1.zip
unzip opencv_contrib-4.5.1.zip
cd opencv-4.5.1/
echo "** Building..."
mkdir release
cd release/
cmake -D WITH_CUDA=ON -D ENABLE_PRECOMPILED_HEADERS=OFF -D CUDA_ARCH_BIN="7.2" -D CUDA_ARCH_PTX="" -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-4.4.0/modules -D WITH_GSTREAMER=ON -D WITH_LIBV4L=ON -D BUILD_opencv_python2=ON -D BUILD_opencv_python3=ON -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=OFF -D BUILD_EXAMPLES=OFF -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..
make -j6
sudo make install
echo "** Install opencv-4.5.1 successfully"
echo "** Bye :)"
If you are using NX -D CUDA_ARCH_BIN="7.2"
Run following script with on path:
$./opencv4.5_xavier_nx.sh /home/TH-Dev/src/

OpenCV Docker multistage build - cannot install prebuilt source

I'm trying to build a Docker image including a very particular configuration of OpenCV with CUDA and GPU support.
The build succeeds, and if I make install it from the same context that built the image, it works with no problems.
The problem happens when I try to use a multi stage build, to avoid keeping all the dependencies needed to build OpenCV. Before you continue reading, what follows might actually be an XY problem, if you have a better solution on how to copy OpenCV build artifacts (including Python bindings!) in a Docker multistage build, that is my actual intent.
Now for my attempted solution and the struggle I have:
I run COPY --from=requirements /opencv /opencv and it works and it apparently copies everything in the right path (I checked the filesystem). But, when I run from the build folder make install, I get this CMake error:
CMake Error: The source directory "" does not exist.
Specify --help for usage, or press the help button on the CMake GUI.
Makefile:2724: recipe for target 'cmake_check_build_system' failed
make: *** [cmake_check_build_system] Error 1
Again, the same command, from the same folder, but without multistage build, works.
Here is my Dockerfile:
# Stage 1: Build
FROM nvidia/cuda:10.2-cudnn7-devel-ubuntu18.04 AS requirements
# Install dependencies
RUN echo "deb http://es.archive.ubuntu.com/ubuntu eoan main universe" | tee -a /etc/apt/sources.list
RUN apt-get update && apt-get -y upgrade
RUN apt-get -y install build-essential cmake unzip pkg-config libjpeg-dev libpng-dev libtiff-dev libavcodec-dev \
libavformat-dev libswscale-dev libv4l-dev libxvidcore-dev libx264-dev libgtk-3-dev libatlas-base-dev \
gfortran python3-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libxvidcore-dev x264 \
libx264-dev libfaac-dev libmp3lame-dev libtheora-dev libfaac-dev libmp3lame-dev libvorbis-dev \
libjpeg-dev libpng-dev libtiff-dev git python3-pip libtbb-dev libprotobuf-dev protobuf-compiler \
libgoogle-glog-dev libgflags-dev libgphoto2-dev libeigen3-dev libhdf5-dev wget libtbb-dev gcc-8 g++-8 llvm \
python3-venv libgirepository1.0-dev
# Install my project requirements
WORKDIR /venv
RUN python3 -m venv /venv
ENV PATH="/venv/bin:$PATH"
ADD requirements.txt requirements.txt
RUN pip3 install -r requirements.txt
# Build OpenCV
WORKDIR /opencv
RUN wget https://github.com/opencv/opencv/archive/4.4.0.zip && mv 4.4.0.zip opencv.zip && unzip opencv.zip && rm opencv.zip
RUN wget https://github.com/opencv/opencv_contrib/archive/4.4.0.zip && mv 4.4.0.zip opencv_contrib.zip && unzip opencv_contrib.zip && rm opencv_contrib.zip
WORKDIR /opencv/opencv-4.4.0/build
ENV SITE_PACKAGES /venv/lib/python3.7/site-packages
ENV EXTRA_MODULES /opencv/opencv_contrib-4.4.0/modules
ENV CUDA_ARCH 7.5
ADD docker/build_opencv.sh .
RUN ./build_opencv.sh
# Stage 2: runtime
FROM nvidia/cuda:10.2-cudnn7-runtime-ubuntu18.04
RUN apt-get update && apt-get -y upgrade
RUN apt-get -y install build-essential cmake python3-venv
# Install OpenCV
COPY --from=requirements /opencv /opencv
WORKDIR /opencv/opencv-4.4.0/build
RUN make install && ldconfig
# build fails here and the rest is specific to my project so I've ommitted it
The build_opencv.sh script has this options:
#!/bin/bash
cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_C_COMPILER=/usr/bin/gcc-8 \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D INSTALL_PYTHON_EXAMPLES=OFF \
-D INSTALL_C_EXAMPLES=OFF \
-D WITH_TBB=ON \
-D WITH_CUDA=ON \
-D BUILD_opencv_cudacodec=OFF \
-D ENABLE_FAST_MATH=1 \
-D CUDA_FAST_MATH=1 \
-D WITH_CUBLAS=1 \
-D WITH_V4L=ON \
-D WITH_QT=OFF \
-D WITH_OPENGL=ON \
-D WITH_GSTREAMER=ON \
-D OPENCV_GENERATE_PKGCONFIG=ON \
-D OPENCV_PC_FILE_NAME=opencv.pc \
-D OPENCV_ENABLE_NONFREE=ON \
-D OPENCV_PYTHON3_INSTALL_PATH=$SITE_PACKAGES \
-D OPENCV_EXTRA_MODULES_PATH=$EXTRA_MODULES \
-D PYTHON_EXECUTABLE=/usr/bin/python3 \
-D WITH_CUDNN=ON \
-D OPENCV_DNN_CUDA=ON \
-D CUDA_ARCH_BIN=$CUDA_ARCH \
-D CUDA_TOOLKIT_ROOT_DIR=/usr/local/cuda-10.2 \
-D WITH_GTK_2_X=OFF \
-D BUILD_EXAMPLES=OFF ..
make -j16
You need at least numpy in your requirements.txt file.
In order to reproduce the issue, a minimal setup would have this structure:
- docker
- Dockerfile
- build_opencv.sh
- requirements.txt
Build using from the root of the build context:
docker build -t opencvmultistage:latest -f docker/Dockerfile .
Am I doing something wrong? Maybe CMake has some weird cache that I'm not copying to the new image and makes the build fail?
For the sake of clarity, if I add make install in the build_opencv.sh script it works, but I have OpenCV installed in the build context and not the runtime, which is not what I pretend to do. make install runs in the same directory, and the same files should be present, so I don't really know what's going on.
It is simpler to run cmake & make and make install in the same stage and then copy the install folders. It will allow to not have any build tools like cmake or build-essential in the final docker image.
We will use a custom CMAKE_INSTALL_PREFIX so that OpenCV binaries are installed to a directory and we can copy it straight to the next stage. Using a custom prefix will avoid having to copy CUDA installation or development libraries no longer required. Then we will run ldconfig on that directory to link the libraries as usual.
Modify the build script to use a custom CMAKE_INSTALL_PREFIX:
mkdir /prefix
cmake -D CMAKE_BUILD_TYPE=RELEASE \
# all compiler flags...
-D CMAKE_INSTALL_PREFIX=/prefix
Modifying the Dockerfile
to run make install in stage 1
# Stage 1: Build
FROM nvidia/cuda:10.2-cudnn7-devel-ubuntu18.04 AS requirements
...
ADD build_opencv.sh .
RUN ./build_opencv.sh && make install
copy the installation in stage 2
# Stage 2: runtime
FROM nvidia/cuda:10.2-cudnn7-runtime-ubuntu18.04
RUN apt-get update && apt-get -y upgrade
RUN apt-get -y install build-essential python3-venv
# Install OpenCV
COPY --from=requirements /prefix /prefix
COPY --from=requirements /venv /venv
ENV PATH="/venv/bin:$PATH"
RUN ldconfig /prefix

Getting CMake Error with Protobuf Library in the configuration of OpenCV in Raspberry Pi

I followed this tutorial to install OpenCV and all the steps worked until I reached the Install part. I did the following:
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D INSTALL_C_EXAMPLES=OFF \
-D INSTALL_PYTHON_EXAMPLES=ON \
-D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-3.3.0/modules \
-D BUILD_EXAMPLES=ON ..
The command performed several tests and showed the General configuration for OpenCV 3.3.0 but at the end I got the following error:
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
Protobuf_LIBRARY
linked by target "opencv_dnn_modern" in directory /home/pi/opencv_contrib-3.3.0/modules/dnn_modern
-- Configuring incomplete, errors occurred!
See also "/home/pi/opencv-3.3.0/build/CMakeFiles/CMakeOutput.log".
See also "/home/pi/opencv-3.3.0/build/CMakeFiles/CMakeError.log".
I have a opencv_contrib-3.3.0 directory though instead of opencv_contrib that's why I included the -3.3.0 in the make.
I solved the issue through the following steps:
Deleting the build folder in the opencv directory
Recreating the build folder: mkdir build
Moving to that build directory: cd build
Adding the following line in the make: -D BUILD_opencv_dnn_modern=OFF
and running it as follows:
cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D INSTALL_C_EXAMPLES=OFF \
-D INSTALL_PYTHON_EXAMPLES=ON \
-D BUILD_opencv_dnn_modern=OFF \
-D ENABLE_NEON=ON \
-D ENABLE_VFPV3=ON \
-D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-3.3.0/modules \
-D BUILD_EXAMPLES=ON ..

issues in installing opencv

i wanted to compile the Opencv for the first using the following commands
cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D INSTALL_PYTHON_EXAMPLES=ON \
-D INSTALL_C_EXAMPLES=OFF \
-D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-3.1.0/modules \
-D PYTHON_EXECUTABLE=~/.virtualenvs/cv/bin/python \
-D BUILD_EXAMPLES=ON ..
but i am getting the following error
-- The CXX compiler identification is unknown
CMake Error at CMakeLists.txt:128 (project):
No CMAKE_CXX_COMPILER could be found.
Tell CMake where to find the compiler by setting either the environment
variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
to the compiler, or to the compiler name if it is in the PATH.
-- Configuring incomplete, errors occurred!
See also "/home/siddhartha/opencv-3.3.0/build/CMakeFiles/CMakeOutput.log".
See also "/home/siddhartha/opencv-3.3.0/build/CMakeFiles/CMakeError.log".
(cv) siddhartha#wipro:~/opencv-3.3.0/build$
anyone has any idea how to solve this issue .

Install OpenCV for python3

I have followed many manuals/tutorials how to install OpenCV, but all seem to work for my python2.7 instead of python3.4 where I want it. I'm following this tutorial but without using virtualenv. When making the
$cmake \
-D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D INSTALL_C_EXAMPLES=OFF \
-D INSTALL_PYTHON_EXAMPLES=ON \
-D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \
-D BUILD_EXAMPLES=ON \
-D PYTHON_EXECUTABLE=/usr/bin/python3.4 \
-D PYTHON_PACKAGES_PATHS=/usr/local/lib/python3.4/dist-packages/ \
-D PYTHON_NUMPY_INCLUDE_DIRS=/usr/local/lib/python3.4/dist-packages/numpy/core/include ..
comand it list both versions:
-- Python 2:
-- Interpreter: /usr/bin/python2.7 (ver 3.4.3)
-- Libraries: NO
-- numpy: /usr/local/lib/python2.7/dist-packages/numpy/core/include (ver 1.10.4)
-- packages path: lib/python2.7/dist-packages
--
-- Python 3:
-- Interpreter: /usr/bin/python3.4 (ver 3.4.3)
-- Libraries: NO
-- numpy: /usr/local/lib/python3.4/dist-packages/numpy/core/include (ver 1.10.4)
-- packages path: lib/python3.4/dist-packages
--
-- Python (for build): /usr/bin/python2.7
But omits the python_executable flag and uses the python2.7 for building (I checked it worked on python2.7 after continuing with the installation).
How can I make it that it uses python3.4 for the build?
Things I tried:
When running this cmake:
cmake \
-D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=$(python3 -c "import sys; print(sys.prefix)") \
-D PYTHON_EXECUTABLE=$(which python3) ..
It list correctly the libraries:
-- Python 2:
-- Interpreter: /usr/bin/python2.7 (ver 3.4.3)
-- Libraries: NO
-- numpy: /usr/local/lib/python2.7/dist-packages/numpy/core/include (ver 1.10.4)
-- packages path: lib/python2.7/dist-packages
--
-- Python 3:
-- Interpreter: /usr/bin/python3.4 (ver 3.4.3)
-- Libraries: /usr/lib/x86_64-linux-gnu/libpython3.4m.so (ver 3.4.3)
-- numpy: /usr/local/lib/python3.4/dist-packages/numpy/core/include (ver 1.10.4)
-- packages path: lib/python3.4/dist-packages
--
-- Python (for build): /usr/bin/python2.7
But still list the python2.7 to build for.
Related info:
$whereis python3
python3: /usr/bin/python3.4dm-config /usr/bin/python3.4m /usr/bin/python3.4m-config /usr/bin/python3.4-config /usr/bin/python3 /usr/bin/python3.4-dbg-config /usr/bin/python3.4 /usr/bin/python3.4-dbg /usr/bin/python3.4dm /etc/python3 /etc/python3.4 /usr/lib/python3.0 /usr/lib/python3.5 /usr/lib/python3 /usr/lib/python3.4 /usr/lib/python3.2 /usr/lib/python3.1 /usr/lib/python3.3 /usr/bin/X11/python3.4dm-config /usr/bin/X11/python3.4m /usr/bin/X11/python3.4m-config /usr/bin/X11/python3.4-config /usr/bin/X11/python3 /usr/bin/X11/python3.4-dbg-config /usr/bin/X11/python3.4 /usr/bin/X11/python3.4-dbg /usr/bin/X11/python3.4dm /usr/local/lib/python3.4 /usr/include/python3.4m /usr/include/python3.4 /usr/include/python3.4dm /usr/share/python3 /usr/share/man/man1/python3.1.gz
I found the answer, after removing the CMakeCache.txt rm CMakeCache.txtI rerun the cmake command:
cmake \
-D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=$(python3 -c "import sys; print(sys.prefix)") \
-D PYTHON_EXECUTABLE=/usr/bin/python3.4 \
-D BUILD_EXAMPLES=ON \
-D INSTALL_C_EXAMPLES=OFF \
-D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \
-D INSTALL_PYTHON_EXAMPLES=ON ..
And the output was:
-- Python 2:
-- Interpreter: /usr/bin/python3.4 (ver 3.4.3)
-- Libraries: /usr/lib/x86_64-linux-gnu/libpython3.4m.so (ver 3.4.3)
-- numpy: /usr/local/lib/python3.4/dist-packages/numpy/core/include (ver 1.10.4)
-- packages path: lib/python3.4/dist-packages
--
-- Python 3:
-- Interpreter: /usr/bin/python3.4 (ver 3.4.3)
-- Libraries: /usr/lib/x86_64-linux-gnu/libpython3.4m.so (ver 3.4.3)
-- numpy: /usr/local/lib/python3.4/dist-packages/numpy/core/include (ver 1.10.4)
-- packages path: lib/python3.4/dist-packages
--
-- Python (for build): /usr/bin/python3.4
--
So I keep with the instalation:
make -j4
sudo make install
sudo ldconfig

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