On Mon, Aug 1, 2011 at 7:56 AM, Sabine Bachmayer <[email protected]> wrote: > Hi! > > I'm using the libraries of ffmpeg 0.7.1 in ubuntu 10.10. > All in all, the libraries work great in Eclipse CDT (using C++) but I > have problems using avformat_write_headers(AVFormatContext*, > AVDictionary**) instead of the deprecated function av_write_header. I > always get the following error during compilation: > undefined reference to `avformat_write_header' C/C++ Problem > > The weird thing is, that I'm able to use other functions that are > declared in libavformat/avformat.h and implemented in > libavformat/utils.c - for example av_guess_format(...) and > av_set_parameters(...), etc. > > There seems to be no mistakes in the usage of avformat_write_headers > which is the following: > avformat_write_header(pFormatCtx,NULL); > where pFormatCtx is of type AVFormatContext* including a previously > opened mpeg file. > > I checked the include paths for C++ and C compilers as well as the > include libraries and library search path for the linker. > > I also tried to include libavformat/utils.c directly, but in this case I > get 44 compiler errors in utils.c which is weird as well because I > already compiled ffmpeg successfully by using its makefile. > > Any idea where the mistake could be? >
You did remember to wrap the include declarations with extern c? > Thank you very much for your help! > > Kind regards, > Sabine > > > > > > > > > > > > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > Filtered-With-Copfilter: Version 0.85.2 (ProxSMTP 1.8) > by Markus Madlener @ http://www.copfilter.org > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user > _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
