OPENCV_FFMPEG_API   10 modules/videoio/src/cap_ffmpeg_api.hpp #   define OPENCV_FFMPEG_API __declspec(dllexport)
OPENCV_FFMPEG_API   12 modules/videoio/src/cap_ffmpeg_api.hpp #   define OPENCV_FFMPEG_API __attribute__ ((visibility ("default")))
OPENCV_FFMPEG_API   14 modules/videoio/src/cap_ffmpeg_api.hpp #   define OPENCV_FFMPEG_API