Linking to libavcodec on Windows

Chris Hennes

I'm new to Windows programming, and am having some trouble getting my code to link. I'm trying to use the libavcodec library from the FFmpeg package. All of my source compiles fine, but when I go to link, all my avcodec calls are unresolved. In my .pro file I've got:

win32: LIBS += -L$$PWD/../ffmpeg/win64/lib/ -lavcodec -lavutil

INCLUDEPATH += $$PWD/../ffmpeg/win64/include
DEPENDPATH += $$PWD/../ffmpeg/win64/include

in the referenced lib directory I've got the download from the FFmpeg website containing the .lib and .dll.a files for avcodec and avutil. The linker doesn't tell me it can't find those libraries or that they are the wrong format, so I'm at a loss. Any idea what's going wrong? On Windows I don't even know how to begin debugging this issue.

Chris Hennes

I'm going to answer my own question in case others are looking for this: I forgot to put my includes inside an extern "C" block, e.g.

extern "C" {
    #include <libavutil/opt.h>
    #include <libavutil/imgutils.h>
    #include <libavcodec/avcodec.h>
}