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Wed Jan 3 21:06:03 CET 2007 · https://ffmpeg.org/pipermail/ffmpeg-devel/2007-January/026998.html

Hello everybody,

  I got the latest SVN version of ffmpeg. Followed every step in the tutorial in order to generate the *.lib files. 

  I'm writing a very simple project under visual studio 2005, and i'm getting the following errors from the linker:

  1>------ Build started: Project: mySourceFilter, Configuration: Debug Win32 ------
  1>Linking...
  1> Creating library .\Debug/mySourceFilter.lib and object .\Debug/mySourceFilter.exp
  1>FFmpegWrapper.obj : error LNK2019: unresolved external symbol _av_register_all at 0 referenced in function "public: __thiscall CffmpegWrapper::CffmpegWrapper(char const *)" (??0CffmpegWrapper@@QAE at PBD at Z)
  1>FFmpegWrapper.obj : error LNK2019: unresolved external symbol _av_close_input_file at 4 referenced in function "public: __thiscall CffmpegWrapper::~CffmpegWrapper(void)" (??1CffmpegWrapper@@QAE at XZ)
  1>FFmpegWrapper.obj : error LNK2019: unresolved external symbol _avcodec_close at 4 referenced in function "public: __thiscall CffmpegWrapper::~CffmpegWrapper(void)" (??1CffmpegWrapper@@QAE at XZ)
  1>FFmpegWrapper.obj : error LNK2019: unresolved external symbol _av_free at 4 referenced in function "public: __thiscall CffmpegWrapper::~CffmpegWrapper(void)" (??1CffmpegWrapper@@QAE at XZ)
  1>FFmpegWrapper.obj : error LNK2019: unresolved external symbol _dump_format at 16 referenced in function "public: int __thiscall CffmpegWrapper::OpenFile(void)" (?OpenFile at CffmpegWrapper@@QAEHXZ)
  1>FFmpegWrapper.obj : error LNK2019: unresolved external symbol _av_find_stream_info at 4 referenced in function "public: int __thiscall CffmpegWrapper::OpenFile(void)" (?OpenFile at CffmpegWrapper@@QAEHXZ)
  1>FFmpegWrapper.obj : error LNK2019: unresolved external symbol _av_open_input_file at 20 referenced in function "public: int __thiscall CffmpegWrapper::OpenFile(void)" (?OpenFile at CffmpegWrapper@@QAEHXZ)
  1>FFmpegWrapper.obj : error LNK2019: unresolved external symbol _avcodec_open at 8 referenced in function "public: int __thiscall CffmpegWrapper::OpenVideoStream(void)" (?OpenVideoStream at CffmpegWrapper@@QAEHXZ)
  1>FFmpegWrapper.obj : error LNK2019: unresolved external symbol _avcodec_find_decoder at 4 referenced in function "public: int __thiscall CffmpegWrapper::OpenVideoStream(void)" (?OpenVideoStream at CffmpegWrapper@@QAEHXZ)
  1>FFmpegWrapper.obj : error LNK2019: unresolved external symbol _avpicture_fill at 20 referenced in function "public: int __thiscall CffmpegWrapper::InitializeBuffers(void)" (?InitializeBuffers at CffmpegWrapper@@QAEHXZ)
  1>FFmpegWrapper.obj : error LNK2019: unresolved external symbol _avpicture_get_size at 12 referenced in function "public: int __thiscall CffmpegWrapper::InitializeBuffers(void)" (?InitializeBuffers at CffmpegWrapper@@QAEHXZ)
  1>FFmpegWrapper.obj : error LNK2019: unresolved external symbol _avcodec_alloc_frame at 0 referenced in function "public: int __thiscall CffmpegWrapper::InitializeBuffers(void)" (?InitializeBuffers at CffmpegWrapper@@QAEHXZ)
  1>FFmpegWrapper.obj : error LNK2019: unresolved external symbol _img_convert at 24 referenced in function "public: int __thiscall CffmpegWrapper::GetFrame(unsigned char *)" (?GetFrame at CffmpegWrapper@@QAEHPAE at Z)
  1>FFmpegWrapper.obj : error LNK2019: unresolved external symbol _avcodec_decode_video at 20 referenced in function "public: int __thiscall CffmpegWrapper::GetFrame(unsigned char *)" (?GetFrame at CffmpegWrapper@@QAEHPAE at Z)
  1>FFmpegWrapper.obj : error LNK2019: unresolved external symbol _av_read_frame at 8 referenced in function "public: int __thiscall CffmpegWrapper::GetFrame(unsigned char *)" (?GetFrame at CffmpegWrapper@@QAEHPAE at Z)
  1>.\Debug/mySourceFilter.dll : fatal error LNK1120: 15 unresolved externals

  I included the following libs in the linker input: 

  libcmt.lib avcodec-51.lib avformat-51.lib avutil-49.lib winmm.lib  strmbasd.lib strmiids.lib

  I put them all on the path for the compiler:  tools->options->VC++directories

  I noticed that avcodec.h and avformat.h include the extern "C" {...} directive in order to prevent the linker from mangling the names of the C style functions. 

  I don't have any clue about what is happening.
  Any ideas ? 
  Thx in advance
  Daniel

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[Ffmpeg-devel] unresolved external symbol