Adding ffmpeg to clion project - ffmpeg

Question

I would liket to add ffmpeg to Clion but I have some problems with it.
My MakeLists.txt looks liek this:
cmake_minimum_required(VERSION 3.10)
project(ffmpeg)
set(CMAKE_CXX_STANDARD 11)
include_directories(libs/ffmpeg/)
include_directories(libs/ffmpeg/include/libavutil/)
include_directories(libs/ffmpeg/include/libaccodec/)
include_directories(libs/ffmpeg/include/libavdevice/)
include_directories(libs/ffmpeg/include/libavfilter/)
include_directories(libs/ffmpeg/include/libavformat/)
include_directories(libs/ffmpeg/include/)
link_directories(libs/ffmpeg/lib/)
set(SOURCE_FILES main.cpp)
add_executable(ffmpeg main.cpp)
target_link_libraries(
ffmpeg
avcodec
avdevice
avfilter
avformat
avresample
avutil
postproc
swresample
swscale
)
I am not sure if I added the libraries and includes in the right way, beacause in my simple main.cpp it can't resolve avcodec_configuration().
My project layout looks as follows:
ffmpeg
-libs
-include
-libavcodec
.
.
.
-lib
-avcodec.lib
-main.cpp
EDIT:
Now all includes are found by the compiler. BUt if I compile I get following error:
c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../../mingw32/bin/ld.exe: cannot find -lavresample
collect2.exe: error: ld returned 1 exit status
mingw32-make.exe[2]: *** [ffmpeg.exe] Error 1
mingw32-make.exe[1]: *** [CMakeFiles/ffmpeg.dir/all] Error 2
mingw32-make.exe: *** [all] Error 2
CMakeFiles\ffmpeg.dir\build.make:96: recipe for target 'ffmpeg.exe' failed
CMakeFiles\Makefile2:66: recipe for target 'CMakeFiles/ffmpeg.dir/all' failed
Makefile:82: recipe for target 'all' failed

Answer 1

I don't recommend to hardcode paths to the headers/libraries in your CMakeLists.txt; this is not portable.
Search for a ready FindFFmpeg.cmake (maybe this one will work?),
add it to your project directory (e.g. into a cmake/ subdirectory),
and connect it to CMAKE_MODULE_PATH. E.g. list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake").
Then refer to ${FFMPEG_LIBRARIES}, ${FFMPEG_INCLUDE_DIRS} and ${FFMPEG_DEFINITIONS}.
Sometimes you have to fix up the FindXXX.cmake modules.

Answer 2

I was able to include the precompiled ffmpeg library to cmake project by creating find cmake scripts and including them in main CMakeLists.txt.
Full example is here : https://github.com/tomkordic/Java-native-HTTP/tree/master/src/main/cpp
In my project a FFMPEG_INCLUDE_DIRECTORY and FFMPEG_LIB_DIRECTORY are passed by gradle build script you can set these manually or discover them in some other way.
FFMPEG_INCLUDE_DIRECTORY is a path to ffmpeg installation include directory, in my case:
/mnt/7fab2260-fb19-41a7-ac7c-816bab2f3b92/install/ffmpeg_build/include
FFMPEG_LIB_DIRECTORY is a path to ffmpeg installation lib directory, in my case:
/mnt/7fab2260-fb19-41a7-ac7c-816bab2f3b92/install/ffmpeg_build/lib
Make sure to set CMAKE_MODULE_PATH to the directory where your find cmake scripts are located.
Build system is for ubuntu 18.04.