C++ 在Cmake中链接libavcodec，查找#u library won'；我不与任何图书馆合作

我正在尝试编译一个使用libavcodec的cpp代码：

 #include <libavcodec/avcodec.h>

用像

ffmpeg

这样的名字

CMake Warning at CMakeLists.txt:17 (find_package):
  By not providing "Findffmpeg.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "ffmpeg", but
  CMake did not find one.

  Could not find a package configuration file provided by "ffmpeg" with any
  of the following names:

    ffmpegConfig.cmake
    ffmpeg-config.cmake

  Add the installation prefix of "ffmpeg" to CMAKE_PREFIX_PATH or set
  "ffmpeg_DIR" to a directory containing one of the above files.  If "ffmpeg"
  provides a separate development package or SDK, be sure it has been
  installed.

顺便说一句，在这之前我安装了sudo apt-y ffmpeg

我正在和你一起编译

add_executable(my_executable ${sources})

最小工作示例

CMakeLists.txt

cmake_minimum_required(VERSION 3.1.0)

project(hello)

find_library(AVCODEC_LIBRARY avcodec)

add_executable(hello main.cpp)

target_link_libraries( hello PRIVATE ${AVCODEC_LIBRARY})

main.cpp

#include <iostream>
using namespace std;

int main() 
{
    cout << "Hello, World!";
    return 0;
}

这就是缺少的内容（即使

libavcodec

出现在我的系统的一些文件夹中）

---

您确定

ffmpeg

附带了CMake包定义吗？您是否尝试手动指定库？@πάνταῥεῖ 我认为ffmpeg不支持cmake。我应该怎样用手做？我认为使用

add_libraries（）

maybe？@πάντα是不可能的ῥεῖ 我认为add_library（libavcodec）添加了该库，但当它尝试加载该库的.h时，编译失败。这是否意味着库没有加载，或者我还需要为它指向include路径？我不想添加我的个人包含路径，我希望它是自动的。我想这里还需要

include\u目录。阅读CMake文档。
#include <iostream>
using namespace std;

int main() 
{
    cout << "Hello, World!";
    return 0;
}

lz@vm:~/mcve$ cmake .
-- The C compiler identification is GNU 7.2.0
-- The CXX compiler identification is GNU 7.2.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
AVCODEC_LIBRARY
    linked by target "hello" in directory /home/lz/mcve

-- Configuring incomplete, errors occurred!
See also "/home/lz/mcve/CMakeFiles/CMakeOutput.log".

sudo apt install -y libavcodec-dev libavformat-dev libavdevice-dev libavfilter-dev