Can't compile OpenCV 3.1 on Raspberry PI: Missing videoio.h, videodev.h,

Question

All, I've followed these instructions: installing OpenCV 3.0 on raspberry pi b+

and these: http://www.pyimagesearch.com/2015/10/26/how-to-install-opencv-3-on-raspbian-jessie/#comment-389260

and neither work, because I keep getting the following fatal errors.

pi@raspberrypi:~/opencv-3.1.0/build $ cat /home/pi/opencv-3.1.0/build/CMakeFiles/CMakeError.log | grep fatal
/home/pi/opencv-3.1.0/build/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:28: fatal error: linux/videodev.h: No such file or directory
/home/pi/opencv-3.1.0/build/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:25: fatal error: sys/videoio.h: No such file or directory
/home/pi/opencv-3.1.0/build/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:29: fatal error: ffmpeg/avformat.h: No such file or directory

I've tried restarting from scratch with a new image of Jessie twice now, and I've scoured the internet and I keep turning up empty handed. Any guidance would be much appreciated. Thanks.

Answer 1

You need the libv4l library. You can install it by running sudo apt-get install libv4l-dev.

In addition, you may also need additional libraries to compile OpenCV properly. Running the command sudo apt-get build-dep opencv should get you everything you need.

Answer 2

Scouring internet for possible solution of the exact same issue I faced landed me here and no solution specified worked. What I did notice though is:-

1. Not all steps described in the pyimagesearch blog were followed - missed some steps - checked one by one though not sure this was the root cause.

2. OpenCV 3.1.0 has a bug and you need to set INSTALL_C_EXAMPLES=OFF. This info is available as an update in the pyimagesearch blog of

   26-10-2015:- "Update (3 January 2016): In order to build OpenCV 3.1.0 , you need to set -D INSTALL_C_EXAMPLES=OFF (rather than ON ) in the cmake command. There is a bug in the OpenCV v3.1.0 CMake build script that can cause errors if you leave this switch on. Once you set this switch to off, CMake should run without a problem"

Answer 3

To fix the first line, you should install the libv4l-dev package and manually link header files:

sudo apt-get install libv4l-dev
cd /usr/include/linux/
sudo ln -s ../libv4l1-videodev.h videodev.h

About the last line:

sudo mkdir /usr/include/ffmpeg && \
sudo ln -sf /usr/include/libavcodec/*.h /usr/include/ffmpeg && \
sudo ln -sf /usr/include/libavformat/*.h /usr/include/ffmpeg && \
sudo ln -sf /usr/include/libswscale/*.h /usr/include/ffmpeg && \

Answer 4

I got the exact same errors too - then I saw, it was a typo... If in the cmake command, the path to the extra modules is wrong, you run into these errors. Therefore be sure, that the directory of the opencv_contrib files is allright, for v. 3.1.0, it should be:

-D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-3.1.0/modules

(and not ...~/opencv_contrib-3.0.0/... what you get when you copy/paste the instructions you mentioned)

Answer 5

A in my case, probably as silly as you get an example to compile/build from older versions.

Check your references are right.

$ cd ~/opencv-3.4.0/
$ mkdir build
$ cd build
$ cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D INSTALL_PYTHON_EXAMPLES=ON  -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-3.4.0/modules -D BUILD_EXAMPLES=ON ..