How set CMake to find a local package FFmpeg?

Question

I am trying write CMakeLists with FFmpeg package, with compile on Windows and Linux. First downloaded from FFmpeg-Builds shared releases

I imagine the structure of the project like this:

<project root>
deps/
  ffmpeg/
    win-x64/
      incluve/
      lib/
      bin/
    linux-x64/
      incluve/
      lib/
      bin/
src/
CMakeLists.txt

How to help CMake find libraries: avcodec, avformat, avutil, etc? Maybe in the folder lib/pkgconfig using PkgConfig it is possible to specify the path. But I dont know how

Answer 1

The following worked well for me on Linux with cmake. You will have to find the equivalents for Windows. I used ffmpeg on Windows, but without cmake (i.e. directly in a Visual Studio project).

1. Install pkg-config, nasm:

    sudo apt-get install -y pkg-config

    sudo apt-get install nasm 

2. Download ffmpeg source code:

   https://ffmpeg.org/download.html

3. Build ffmpeg and install it:

   tar -xvf <downloaded_filename>
   cd /root/folder/with/ffmpeg/src
   ./configure
   make
   sudo make install 
   

4. Add the following to your CMakeLists.txt:

   In the beginning:

    find_package(PkgConfig REQUIRED)
    pkg_check_modules(LIBAV REQUIRED IMPORTED_TARGET
        libavdevice
        libavfilter
        libavformat
        libavcodec
        libswresample
        libswscale
        libavutil
    )
   
    set(CMAKE_FIND_LIBRARY_SUFFIXES .a ${CMAKE_FIND_LIBRARY_SUFFIXES})
   

   In the linker area:

    target_link_libraries(${PROJECT_NAME} PUBLIC PkgConfig::LIBAV)