Runtime Opencv HighGui Error- “HIGHGUI ERROR: V4L/V4L2: VIDIOC_S_CROP”. Opencv cross compiled. Host=64bit Ubuntu 12.04. Target=ARM-Cortex-A9

Question

I am a beginner at OpenCV and trying my best to get a simple application running on an embedded platform. I cross-compiled OpenCV 2.4.4 and built it WITH_GTK=ON, WIT

Answer 1

Opencv highgui error

Have to reinstall opencv using cmake

git clone https://github.com/Itseez/opencv.git
cd ~/opencv 
mkdir release 
cd release 
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_IPP=OFF ..
make -j4 sudo 
make install
export PYTHONPATH=$PYTHONPATH:/usr/local/lib/python2.7/site-packages

Answer 2

After doing the cmake statement Verify whether the output of cmake includes the following text: V4L/V4L2: Using libv4l.

If it is not there, then install v4l2ucp, v4l-utils and libv4l-dev from synaptic package manager. Then cmake and build again.

This worked for me but I was using OpenCV with python bindings on Ubuntu 12.04.

Answer 3

In order to cross compile you need to tell pkg-config to lookup the proper path (by default this will be your host config/.pc files!)

From pkg-config website

• searching directories listed in $PKG_CONFIG_PATH
• when $PKG_CONFIG_LIBDIR is specified, it will override the compiled in default directory (e.g. /usr/lib/pkgconfig) and the PKG_CONFIG_PATH. Note that when specifying PKG_CONFIG_LIBDIR, pkg-config will completely ignore the content in PKG_CONFIG_PATH, even if the documentation states different things.