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• Linker error using FFMPEG with Visual Studio 2013 Express

  19 décembre 2013, par Andres

  I am trying to write a program using FFMPEG libraries. I read about in this link. I downloaded Shared and Devs files from http://ffmpeg.zeranoe.com/builds/.

  I created a console project and this is the configuration :

  Additional Libraries Directories
  

  Additional Include Directories
  

  And here is my code :

  #include "stdafx.h"
  
  #pragma comment (lib, "avformat.lib")
  
  #pragma comment (lib, "avcodec.lib")
  
  #pragma comment (lib, "avutil.lib")
  
  
  
  extern "C"
  
  {
  
      #ifndef __STDC_CONSTANT_MACROS
  
      #define __STDC_CONSTANT_MACROS
  
      #endif
  
      #include 
  
      #include 
  
      #include 
  
      #include 
  
  }
  
  int _tmain(int argc, _TCHAR* argv[])
  
  {
  
      av_register_all();
  
      return 0;
  
  }

  And the error I am getting is this :

  Error 1 error LNK2019 : unresolved external symbol _av_register_all
  referenced in function _wmain C :\Users\Andres\Documents\Visual Studio
  2013\Projects\PruebaFFMPEG\PruebaFFMPEG\PruebaFFMPEG.obj PruebaFFMPEG

  Error 2 error LNK1120 : 1 unresolved
  externals C :\Users\Andres\Documents\Visual Studio
  2013\Projects\PruebaFFMPEG\Debug\PruebaFFMPEG.exe PruebaFFMPEG

  What am I missing ?

• CoCreateInstanceFromApp undefined with WinRT + Visual Studio 2013

  7 novembre 2014, par Hyndrix

  I am experimenting with ffmpeg and Windows RT (ARM). First I run configure in a MinGW/MSYS shell :

  ./configure --enable-shared --disable-static --toolchain=msvc --extra-cflags="-D_M_ARMM -D_ARM_WINAPI_PARTITION_DESKTOP_SDK_AVAILABLE -DWINAPI_FAMILY=WINAPI_FAMILY_APP" --enable-cross-compile --target-os=win32 --arch=win32 --extra-ldflags="-MACHINE:ARM" --arch=arm --cpu=armv7

  followed by a "make" (in the same shell) which ends with the following error :

  C:\Program Files (x86)\Windows Kits\8.1\include\um\combaseapi.h(1157) : 
  
  error C4013: 'CoCreateInstanceFromApp' undefined; assuming extern returning int
  
  make: *** [libavformat/format.o] Error 2

  The environmental variables in the shell are set to ARM Visual Studio 2013.

  What does this error mean ? Can someone point me in the correct direction how to fix this problem ?

  Regards,

• Revision 65f13afd7d : Fix building for arm with Visual Studio 2013 The microsoft build tools explicit

  4 mai 2014, par Martin Storsjo

  Changed Paths :
   Modify /build/make/configure.sh

  
   Modify /build/make/gen_msvs_vcxproj.sh

  
  
  Fix building for arm with Visual Studio 2013

  The microsoft build tools explicitly disallow building for arm in
  the "desktop" target configuration ; one has to target "Windows
  Store" apps (aka WinRT/Metro) or Windows Phone. In Visual Studio
  2012, one could just pick the v110_wp80 toolset which made the
  vcxproj files buildable. In Visual Studio 2013, picking the v120_wp81
  toolset isn’t enough - one has to configure the vcxproj files
  as an "AppContainerApplication". This has the implication that
  you can’t just build a plain .exe (such as the examples) - an .exe
  project would need to have an AppxManifest file. Therefore we can
  only build the library itself.

  If loaded into Visual Studio for Windows (the Windows Store/Phone
  version of Visual Studio, not the Desktop one), the obj_int_extract
  project is omitted since it’s treated as incompatible. Building
  from the command line with msbuild works fine though.

  The armv7-win32-vs12 target was added as part of a638bdf4 even
  though actual use of it hadn’t been tested.

  Change-Id : Iee8088252cf790317aeb6b417d29058225f1f629