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• configure : do not link libraries against program-specific dependencies

  13 février 2014, par Janne Grunau

  configure : do not link libraries against program-specific dependencies
  Bug-Id : 635
  

  • [DBH] configure

• Unable to link with libx264.lib static library

  3 novembre 2013, par dtumaykin

  I’m building custom video encoder using x264 as a static library. I’ve followed this guide in order to build static library. Trying to compile this :

  x264_t * setup_encoder(int width, int height){
  
      x264_param_t param;
  
      x264_param_default_preset(&param, "veryfast", "zerolatency");
  
      param.i_threads = 1;
  
      param.i_width = width;
  
      param.i_height = height;
  
      param.i_fps_num = 26;
  
      param.i_fps_den = 1;
  
      // Intra refres:
  
      param.i_keyint_max = 26;
  
      param.b_intra_refresh = 1;
  
      //Rate control:
  
      param.rc.i_rc_method = X264_RC_CRF;
  
      param.rc.f_rf_constant = 25;
  
      param.rc.f_rf_constant = 25;
  
      param.rc.f_rf_constant_max = 35;
  
      //For streaming:
  
      param.b_repeat_headers = 1;
  
      param.b_annexb = 1;
  
      x264_param_apply_profile(&param, "baseline");
  
  
  
      return x264_encoder_open(&param);
  
  }

  Results in :

  main.obj : error LNK2019 : unresolved external symbol "int __cdecl x264_param_default_preset(struct x264_param_t *,char const *,char const *)"

  main.obj : error LNK2019 : unresolved external symbol "int __cdecl x264_param_apply_profile(struct x264_param_t *,char const *)"

  main.obj : error LNK2019 : unresolved external symbol "struct x264_t * __cdecl x264_encoder_open_136(struct x264_param_t *)"

  %PROJECT_DIR% : fatal error LNK1120 : 3 unresolved externals

  Linker scans libx264.lib, but can’t find anything inside.

  Searching .\lib\libx264.lib:

  With dumpbin /HEADERS I can actually find the declaration I need, but linker is unable to do it.

  SECTION HEADER #38
  
     .text name
  
         0 physical address
  
         0 virtual address
  
       E60 size of raw data
  
      930C file pointer to raw data (0000930C to 0000A16B)
  
      D219 file pointer to relocation table
  
         0 file pointer to line numbers
  
        40 number of relocations
  
         0 number of line numbers
  
  60501020 flags
  
           Code
  
           COMDAT; sym= x264_param_default_preset
  
           16 byte align
  
           Execute Read

  Enviroment is Visual Studio 2012 with Intel Compiler 14 on Windows 8 64-bit.

• Windows libs for ffmpeg don't link (visual studio) ?

  21 octobre 2013, par Chad Mourning

  So, I'm trying to get a project I'm writing to link against ffmpeg libraries but I keep getting linker errors :

  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "struct AVCodec * __cdecl avcodec_find_encoder(enum AVCodecID)" (?avcodec_find_encoder@@YAPEAUAVCodec@@W4AVCodecID@@@Z)
  
  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "int __cdecl av_dict_set(struct AVDictionary * *,char const *,char const *,int)" (?av_dict_set@@YAHPEAPEAUAVDictionary@@PEBD1H@Z)
  
  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "int __cdecl avcodec_encode_video(struct AVCodecContext *,unsigned char *,int,struct AVFrame const *)" (?avcodec_encode_video@@YAHPEAUAVCodecContext@@PEAEHPEBUAVFrame@@@Z)
  
  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "struct AVCodecContext * __cdecl avcodec_alloc_context3(struct AVCodec const *)" (?avcodec_alloc_context3@@YAPEAUAVCodecContext@@PEBUAVCodec@@@Z)
  
  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "struct AVFrame * __cdecl avcodec_alloc_frame(void)" (?avcodec_alloc_frame@@YAPEAUAVFrame@@XZ)
  
  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "void __cdecl av_free(void *)" (?av_free@@YAXPEAX@Z)
  
  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "int __cdecl avcodec_open2(struct AVCodecContext *,struct AVCodec const *,struct AVDictionary * *)" (?avcodec_open2@@YAHPEAUAVCodecContext@@PEBUAVCodec@@PEAPEAUAVDictionary@@@Z)
  
  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "int __cdecl avcodec_close(struct AVCodecContext *)" (?avcodec_close@@YAHPEAUAVCodecContext@@@Z)
  
  1>C:\STEAMiE\usr\modules\LASReader\win32\Release\LASReader.exe : fatal error LNK1120: 8 unresolved externals

  I downloaded the dev package from :

  http://ffmpeg.zeranoe.com/builds/

  But when I link against the libs like I normally would, I get the linker errors. Is this package somehow different from every other library I've tried to use that I just need the .h/.libs for ? Is there a reason why it has to be that way ?