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Sur d’autres sites (11935)

  • lld-link error compiling chromium with ffmpeg additional calls

    1er décembre 2020, par michal-b

    After adding some calls to ffmpeg from the ffmpeg_decoding_loop, I have errors when compiling on Windows (both directly on Windows and when cross-compiling from linux).
    
What I don't understand is that it works without an issue on linux/macos.

    


    I have multiple calls to ffmpeg code but let's boil it down to a representative example.

    


    I call this :

    


    const AVFilter *buffer_src = avfilter_get_by_name("buffer");


    


    On linux/macos : no problems.
    
On windows :

    


    lld-link: error: undefined symbol: avfilter_get_by_name
>>> referenced by .\..\..\media\ffmpeg\ffmpeg_decoding_loop.cc:111
>>>               obj/media/ffmpeg/ffmpeg/ffmpeg_decoding_loop.obj:(public: void __cdecl media::FFmpegDecodingLoop::InitFilterGraph(struct AVFrame *))
>>> referenced by .\..\..\media\ffmpeg\ffmpeg_decoding_loop.cc:112
>>>               obj/media/ffmpeg/ffmpeg/ffmpeg_decoding_loop.obj:(public: void __cdecl media::FFmpegDecodingLoop::InitFilterGraph(struct AVFrame *))



    


    Is there some additional configuration to be made on windows ?
    
I use visual studio 2019, windows 10.0.19041.0 sdk, llvm 10.0.0.

    


  • Unable to link FFMpeg libraries in Visual studio 2012

    29 juin 2013, par Pferd

    I have been trying to link the FFMPEG static libraries to Visual studio 2012 in c++ environment. But i get the following error.

    • Error 1 error LNK1104 : cannot open file
      'avcodec.lib' C :\Users\username\Documents\Visual Studio
      2012\Projects\ConsoleApplication5\ConsoleApplication5\LINK ConsoleApplication5

    my lib files were located in C :\Users\username\Documents\Visual Studio 2012\Projects\ConsoleApplication5\ConsoleApplication5\ExtLib\lib

    The compile seems to be fine. The command line is

    • /Yu"stdafx.h" /GS /W3 /Zc:wchar_t
      /I"C :\Users\username\Documents\Visual Studio
      2012\Projects\ConsoleApplication5\ConsoleApplication5\ExtLib\include"
      /Zi /Gm /Od /sdl /Fd"x64\Debug\vc110.pdb" /fp:precise /D "WIN32" /D
      "_DEBUG" /D "_CONSOLE" /D "_UNICODE" /D "UNICODE" /errorReport:prompt
      /WX- /Zc:forScope /RTC1 /Gd /MTd /Fa"x64\Debug\" /EHsc /nologo
      /Fo"x64\Debug\" /Fp"x64\Debug\ConsoleApplication5.pch"

    The main issue seems to be at the linking stage where I have just not been able to get VS2012 to find my ffmpeg .lib files

    The linker command line is below :

    • /OUT :"C :\Users\username\Documents\Visual Studio
      2012\Projects\ConsoleApplication5\x64\Debug\ConsoleApplication5.exe"
      /MANIFEST /NXCOMPAT /PDB :"C :\Users\username\Documents\Visual Studio
      2012\Projects\ConsoleApplication5\x64\Debug\ConsoleApplication5.pdb"
      /DYNAMICBASE "avcodec.lib" "kernel32.lib" "user32.lib" "gdi32.lib"
      "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib"
      "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib"
      /DEBUG /MACHINE:X64 /OPT:NOREF /INCREMENTAL
      /PGD :"C :\Users\username\Documents\Visual Studio
      2012\Projects\ConsoleApplication5\x64\Debug\ConsoleApplication5.pgd"
      /SUBSYSTEM:CONSOLE /MANIFESTUAC :"level='asInvoker' uiAccess='false'"
      /ManifestFile :"x64\Debug\ConsoleApplication5.exe.intermediate.manifest"
      /ERRORREPORT:PROMPT /NOLOGO
      /LIBPATH :"/LIBPATH:C :\Users\username\Documents\Visual Studio
      2012\Projects\ConsoleApplication5\ConsoleApplication5\ExtLib\lib"
      /TLBID:1

    I cant figure out why the linker cant locate my ffmpeg lib files even though they are physically located in the /LIBPATH area - c :...\vs12...\ExtLib\lib

  • Révision 20430 : les link opensearch ne sont pas des feeds, ils ne fournissent rien donc évitons ...

    20 avril 2013, par kent1 -

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