Thanks Brian: I didn't find any header file named ffmpeg.h from the package.
On Tue, Jun 8, 2010 at 2:40 PM, Hai Yi <[email protected]> wrote: > Thanks Jeff. However, the header file of those C routines are included in > ffmpegmgr.h, which is in turn included by ffmpegmgr.cpp. > > The "undefined reference " normally indicates that the functions's > definitions are not found, and it takes place when doing the linker. The > libraries, libavcodec, etc, have been specified from the g++ command line, > and seems to work - only that I need to make the encapulated member function > in ffmpegmgr.cpp inline to eliminate the linker error: > > inline void FFMpegMgr::new_video_stream(AVFormatContext *oc) > { > ... > st = av_new_stream(oc, oc->nb_streams); > ... > } > > Also, the lib that I specified is *.a, will it be different if the lib is > *.so ? > > Thanks, > Hai > > > > On Mon, Jun 7, 2010 at 1:26 AM, Jeff Newmiller > <[email protected]>wrote: > >> Seems more likely that you haven't included the declarations for the C >> routines in your cpp file. Would need to see more context to diagnose. >> >> "Hai Yi" <[email protected]> wrote: >> >> >Hello all: >> > >> >I created a class FFMpegMgr and a method init(); inside init() I just put >> >three ffmpeg api there: >> >avcodec_register_all(); >> >avdevice_register_all(); >> > av_register_all(); >> > >> >The source file ffmpegmgr.cpp look like this: >> > >> > void FFMpegMgr::init() { >> > avcodec_register_all(); >> > avdevice_register_all(); >> > av_register_all(); >> > >> >} >> > >> >Now I got a "undefined reference to avcodec_register_all" error. >> > >> >if I put that body in the class declaration or add a "inline" keyword, >> that >> >problem was gone and the compilation succeeded. >> > >> >question is, do those three functions, which are C functions defined in >> >avcodec.h, have to be used only in the inline functions in C++? >> > >> >Sorry if it appear naive - I've been out of touch with C/C++ for a while. >> > >> >Thanks! >> >Hai >> >_______________________________________________ >> >vox-tech mailing list >> >[email protected] >> >http://lists.lugod.org/mailman/listinfo/vox-tech >> >> >> --------------------------------------------------------------------------- >> Jeff Newmiller The ..... ..... Go >> Live... >> DCN:<[email protected]> Basics: ##.#. ##.#. Live >> Go... >> Live: OO#.. Dead: OO#.. Playing >> Research Engineer (Solar/Batteries O.O#. #.O#. with >> /Software/Embedded Controllers) .OO#. .OO#. >> rocks...1k >> >> --------------------------------------------------------------------------- >> Sent from my phone. Please excuse my brevity. >> _______________________________________________ >> vox-tech mailing list >> [email protected] >> http://lists.lugod.org/mailman/listinfo/vox-tech >> > >
_______________________________________________ vox-tech mailing list [email protected] http://lists.lugod.org/mailman/listinfo/vox-tech
