On Thu, Apr 5, 2012 at 03:14, Gustav González <[email protected]> wrote: > Hi, > > Currently I'm trying to compile my C++ project on Windows 7. > I want to know if there are any kind of considerations about how to link the > ffmpeg libraries from a C/C++ program on MS platforms. > > I downloaded these files: > http://ffmpeg.zeranoe.com/builds/win32/dev/ffmpeg-0.8-win32-dev.7z > http://ffmpeg.zeranoe.com/builds/win32/shared/ffmpeg-0.8-win32-shared.7z > > For the compilation process I'm using this option and it seems to work: > -I"c:\QtSDK\Desktop\ffmpeg\include" > > My linking option is this: > > -LC:/QtSDK/Desktop/ffmpeg/bin/avcodec-53.dll > -LC:/QtSDK/Desktop/ffmpeg/bin/avformat-53.dll > -LC:/QtSDK/Desktop/ffmpeg/bin/avutil-51.dll > > But the linking process fails printing a lot of these messages: > > ./release\kffmpegmoviegenerator.o:kffmpegmoviegenerator.cpp:(.text+0x390): > undefined reference to `avcodec_close' > ./release\kffmpegmoviegenerator.o:kffmpegmoviegenerator.cpp:(.text+0x39c): > undefined reference to `av_free' > ./release\kffmpegmoviegenerator.o:kffmpegmoviegenerator.cpp:(.text+0x3a6): > undefined reference to `av_free' > ./release\kffmpegmoviegenerator.o:kffmpegmoviegenerator.cpp:(.text+0x3b7): > undefined reference to `av_free' > ./release\kffmpegmoviegenerator.o:kffmpegmoviegenerator.cpp:(.text+0x3c2): > undefined reference to `av_free' > ./release\kffmpegmoviegenerator.o:kffmpegmoviegenerator.cpp:(.text+0x408): > undefined reference to `av_write_trailer' > > Any hint? Any suggestion? > > Thanks! > > -- > ============================ > Gustav Gonzalez > [email protected] > ============================
Do you use any av_* functions that the linker does not complain about? I think you have the linking syntax wrong. -L normally points to a directory, not a file. Also, zeranoe provides the import libraries in /lib directory. Thus, you probably need something like: -L C:/QtSDK/Desktop/ffmpeg/lib -lavformat-53.dll -lavutil-51.dll BR, Alex Cohn PS: to understand how Mingw works with dlls and "import libraries", look at http://www.mingw.org/wiki/CreateImportLibraries. _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
