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• FFMPEG Visual Studio 2013

  31 janvier 2015, par João M

  I’m trying use a ffmpeg static lib in VC 2013 but when i try build i get this following erros

  avcodec.lib(ffv1enc.o) : error LNK2019: unresolved external symbol __imp_log2 referenced in function find_best_state
  
  
  
  avcodec.lib(iirfilter.o) : error LNK2001: unresolved external symbol __imp_lrintf
  
  
  
  avcodec.lib(aaccoder.o) : error LNK2001: unresolved external symbol __imp_log2f
  
  
  
  avutil.lib(eval.o) : error LNK2001: unresolved external symbol __imp__dclass
  
  
  
  avcodec.lib(aacdec.o) : error LNK2019: unresolved external symbol __imp_cbrtf referenced in function decode_spectrum_and_dequant

  What i’m missing ?

• Error Link 2001 libavformat.a(tls_schannel.o) when building any ffmpeg project in Visual Studio 2010

  15 mai 2017, par M.Taha

  I have just built ffmpeg latest version 3.0 and when I am trying to build ffmpeg related project in Visual Studio 2010, it gives this error :

  libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol _FreeContextBuffer@4

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol _InitializeSecurityContextA@48

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol __imp__ApplyControlToken@8

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol __imp__FreeCredentialsHandle@4

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol __imp__DeleteSecurityContext@4

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol _AcquireCredentialsHandleA@36

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol _DecryptMessage@16

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol _EncryptMessage@16

  1>libavformat.a(tls_schannel.o) : error LNK2001 : unresolved external symbol _QueryContextAttributesA@12

  My project is able to build an older version from 2014. When I search in 2014 ffmpeg there is no tls_schannel.c present.

  But I have to make project now with latest ffmpeg3.0.
  So please tell me how to make it work.

• 'imported-lib - NOTFOUND' in building ffmpeg 3.2 for android studio 2.2

  17 février 2017, par mdang

  I am trying to build and use ffmpeg for Android. My Andoid Studio version is 2.2.2 and ffmpeg is 3.2. Following Android documentation on how to import rebuild library, I think I got the setting right but kept on getting this error

  ninja: error: 'avcodec-NOTFOUND', needed by '../../../../build/intermediates/cmake/debug/obj/armeabi-v7a/...

  This is the setting

  add_library( avcodec SHARED IMPORTED )
  
  add_library( avdevice SHARED IMPORTED )
  
  add_library( avfilter SHARED IMPORTED )
  
  add_library( avformat SHARED IMPORTED )
  
  add_library( avutil SHARED IMPORTED )
  
  add_library( swscale SHARED IMPORTED )
  
  
  
  set_target_properties( avcodec
  
                          PROPERTIES FFMPEG_LIB_IMPORTED_LOCATION
  
                          libs/ffmpeg/${ANDROID_ABI}/lib/libavcodec.so
  
                          )
  
  set_target_properties(  avdevice
  
                          PROPERTIES FFMPEG_LIB_IMPORTED_LOCATION
  
                          libs/ffmpeg/${ANDROID_ABI}/lib/libavdevice.so
  
                          )
  
  set_target_properties( avfilter
  
                          PROPERTIES FFMPEG_LIB_IMPORTED_LOCATION
  
                          libs/ffmpeg/${ANDROID_ABI}/lib/libavfilter.so
  
                          )
  
  set_target_properties( avformat
  
                          PROPERTIES FFMPEG_LIB_IMPORTED_LOCATION
  
                          libs/ffmpeg/${ANDROID_ABI}/lib/libavformat.so
  
                          )
  
  set_target_properties( avutil
  
                          PROPERTIES FFMPEG_LIB_IMPORTED_LOCATION
  
                          libs/ffmpeg/${ANDROID_ABI}/lib/libavutil.so
  
                          )
  
  set_target_properties( swscale
  
                          PROPERTIES FFMPEG_LIB_IMPORTED_LOCATION
  
                          libs/ffmpeg/${ANDROID_ABI}/lib/libswscale.so
  
                          )
  
  
  
  # Specifies a path to native header files.
  
  include_directories(
  
                      libs/ffmpeg/${ANDROID_ABI}/include
  
                      )
  
  
  
  target_link_libraries( # Specifies the target library.
  
                         native-lib
  
  
  
                         # Links the target library to the log library
  
                         # included in the NDK.
  
                         avcodec avdevice avfilter avformat avutil swscale
  
                         ${log-lib}
  
                          )

  If I specify the full library name, libavcodec.so..., the error would go away.

  target_link_libraries( # Specifies the target library.
  
                         native-lib
  
  
  
                         # Links the target library to the log library
  
                         # included in the NDK.
  
                         libavcodec.so libavdevice.so libavfilter.so libavformat.so libavutil.so libswscale.so
  
                         ${log-lib}
  
                          )

  I wonder if anyone encountered similar issue or know why the compilation behaves this way.