如何通过cmake链接ffmpeg库？

Question

I want to use ffmpeg library in my c++ program.

I've downloaded ffmpeg source.
During make&compile process, i had this error:
UINT64_C not defined!
After some search:

1.Adding the following code to libavutil/common.h

#ifndef INT64_C
#define INT64_C(c) (c ## LL)
#define UINT64_C(c) (c ## ULL)
#endif

2. ./configure&compile had solved that problem.

But now i want to link this library to a simple encoding method by using cmake files.
I've tried some sample of CMakeLists.txt but i still have
"undefined refrence " error
many thanks!

• I am working in ubuntu
• using g++ as c++ compiler
• using FFmpeg 2.0.1

Answer 1

you ought to write a finder for ffmpeg library, then use it in your cmake-enabled project to detect a correct location and all required files (headers and libs), possible allowing to user to override search results (if we are talking about a really good finder)...

there are plenty tutorials about how to do that over the net. moreover, it will be relatively easy, because ffmpeg has a bunch of .pc files (at least in my gentoo system), so all that you need is to reuse pkg-config to "detect" it... and cmake have a module called FindPkgConfig w/ macro pkg_check_modules to even more simplify this task. after all, do not forget to use FindPackageHandleStandardArgs .

read details in a /usr/share/cmake/Modules/readme.txt or google it...