Opencv_contrib: fatal error: ffmpeg/avformat.h: No such file or directory during installation in linux

[ankitVarshney1988]

Hi,
I am getting following error while making build of opencv-contrib.git.
CMakeFiles/cmTryCompileExec3380356095.dir/build.make:57: recipe for target 'CMakeFiles/cmTryCompileExec3380356095.dir/CheckIncludeFile.c.o' failed
make[1]: Leaving directory '/home/ecomadmin/Documents/opencv/opencv/build/CMakeFiles/CMakeTmp'
make[1]: ** [CMakeFiles/cmTryCompileExec3380356095.dir/CheckIncludeFile.c.o] Error 1
Makefile:118: recipe for target 'cmTryCompileExec3380356095/fast' failed
make: ** [cmTryCompileExec3380356095/fast] Error 2

Determining if the include file ffmpeg/avformat.h exists failed with the following output:
Change Dir: /home/ecomadmin/Documents/opencv/opencv/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTryCompileExec1258602677/fast"
/usr/bin/make -f CMakeFiles/cmTryCompileExec1258602677.dir/build.make CMakeFiles/cmTryCompileExec1258602677.dir/build
make[1]: Entering directory '/home/ecomadmin/Documents/opencv/opencv/build/CMakeFiles/CMakeTmp'
/usr/bin/cmake -E cmake_progress_report /home/ecomadmin/Documents/opencv/opencv/build/CMakeFiles/CMakeTmp/CMakeFiles 1
Building C object CMakeFiles/cmTryCompileExec1258602677.dir/CheckIncludeFile.c.o
/usr/bin/cc -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -o CMakeFiles/cmTryCompileExec1258602677.dir/CheckIncludeFile.c.o -c /home/ecomadmin/Documents/opencv/opencv/build/CMakeFiles/CMakeTmp/CheckIncludeFile.c
/home/ecomadmin/Documents/opencv/opencv/build/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:29: fatal error: ffmpeg/avformat.h: No such file or directory
#include
^
compilation terminated.

[alalek]

It is just a CMake configuration check. There are no any fatal errors.

Take a look on OpenCV Installation tutorials or on steps which we use to test OpenCV.

[ankitVarshney1988]

Hi,
i am following installation steps from http://docs.opencv.org/3.1.0/d7/d9f/tutorial_linux_install.html#gsc.tab=0
I got error while i am building contrib repository https://github.com/Itseez/opencv_contrib.git in opencv build folder by running following command

cmake -D CMAKE_BUILD_TYPE=Release -D OPENCV_EXTRA_MODULES_PATH=/home/ecomadmin/Documents/opencv/opencv_contrib ..

I woud be thankful if you help in this.

[alalek]

Provided information is not very helpful. Could you add CMake stdout log?

OPENCV_EXTRA_MODULES_PATH should point to "modules" subdirectory of opencv_contrib.

[daemonPainter]

Hi! I'm getting the same error myself.

What I do is the following:

git clone <full_path>opencv.git to ~/opencv (success)
git clone <full_path>opencv_contrib.git to ~/opencv_contrib (success)

mkdir /release in /opencv (success)

doing cmake config in /release as per http://docs.opencv.org/trunk/d7/d9f/tutorial_linux_install.html
now, if I try to run this line: cmake -DOPENCV_EXTRA_MODULES_PATH=<opencv_contrib>/modules <opencv_source_directory> BEFORE make i got the same error message as shown by ankitVarshney1988. The same happens if I append the option for OPENCV_EXTRA_MODULES_PATH to the first cmake statement.

---

What I did to overcome the issue it to use FULL path to the opencv_contrib modules (/home/<user>/<opencv_contrib>/modules) as argument of OPENCV_EXTRA_MODULES_PATH. I have done this in two separate steps: first cmake the opencv core package, make it, then cmake the opencv_contrib and finally make it.
I tried all of the combinations that came to my mind, and this one was the only one working.

[sysradium]

Running cmake twice without and then with extra modules path helps. But in my case it was a 3.1.0 release from a website.