Recherche avancée

Sur d’autres sites (10566)

• Compile FFmpeg Zeranoe Build with Visual Studio 2013

  19 janvier 2016, par mFeinstein

  I downloaded the most recent Zeranoe dev build here, included the header files to my code, placed extern "C" around the includes, since this is a C++ project and FFmpeg is a C library, and added the libs to Visual Studio as well, and I get this linker error :

  1>Camera.obj : error LNK2019 : unresolved external symbol _av_free referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_freep referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_frame_alloc referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_frame_free referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_register_all referenced in function __catch$ ??0Camera@MicroDFV_Camera@@QAE@V ?$basic_string@DU ?$char_traits@D@std@@V ?$allocator@D@2@@std@@0PAX@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_alloc_context3 referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_open2 referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_close referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_init_packet referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_packet_unref referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_find_encoder referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _avcodec_encode_video2 referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_opt_set referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>Camera.obj : error LNK2019 : unresolved external symbol _av_image_alloc referenced in function __catch$ ?NewFrameReceived@Camera@MicroDFV_Camera@@AAEXKKKGPAE@Z$0
  1>M :\Desktop\OpenCVTest\Debug\OpenCVTest.exe : fatal error LNK1120 : 14 unresolved externals

  Searching here and on Google I found many recommendations, such as to add #pragma comment(lib,...), and that the libs are static, so their order is important, and none of this helps.

  So I scratched my head even more and realized that the Zeranoe build is made with MinGW-w64, so probably it won’t link with Visual Studio. I inspected the lib using dumpbin and the symbols on the libs don’t have the underscore, so I am pretty sure it won’t work.

  The other Zeranoe builds for Windows don’t have libs, they are just plain .exe or exe + .dll.

  Will I have to make my own VS2013 build of FFmpeg to link it, or is there some alternative way ?

• Anomalie #2013 (Fermé) : Limiter la previsu en redaction à ses propres articles

  7 novembre 2015, par cedric -

  ce ticket part dans tous les sens et n’est plus guère compréhensible, chacun y allant de ses voeux.
  Donc :
  1/ les redacteurs peuvent maintenant previsualiser leurs articles en cours de redaction
  2/ les articles en cours de redaction ne sont pas visible par les autres auteurs, y compris les admins, y compris dans l’espace privé. C’est un choix historique de SPIP pour permettre à chaque auteur de se sentir libre d’entamer une rédaction sans contrainte et sans avoir à se dire "attention il y a peut-être quelqu’un qui me lit".

  Pour une évolution éventuelle de cette politique il faut ouvrir un autre ticket svp. Pour un bug eventuel sur la previsu, merci d’ouvrir un autre ticket aussi.

• Using ffmpeg with Visual Studio 2013 and C

  19 juin 2016, par user5000935

  I’m try
  main.c
  av_register_all() ;

  AVFormatContext *pFormatCtx = NULL;
  
  
  
  // Open video file
  
  if (avformat_open_input(&pFormatCtx, argv[1], NULL, NULL) != 0)
  
      return -1; // Couldn't open file
  
  
  
  if (avformat_find_stream_info(pFormatCtx, NULL) < 0)
  
      return -1; // Couldn't find stream information
  
  }

  • I’ve added the include (C :\ffmpeg\include) directory to my C/C++ > General > Additional Include Directories ;
  • I’ve added
    I’m using "Zeranoe FFmpeg Build Version : git-5911eeb (2015-10-08)". I tried both 32/64bits versions as said in another question here in SO.

  These are the errors I’m getting :

  Error   3   error C2143: syntax error : missing ';' before '{'  c:\ffmpeg\include\libavutil\error.h 110 1   FFMpeg Test
  
  Error   6   error C2143: syntax error : missing ';' before '{'  c:\ffmpeg\include\libavutil\mem.h   94  1   FFMpeg Test
  
  Error   9   error C2143: syntax error : missing ';' before '{'  c:\ffmpeg\include\libavutil\mem.h   229 1   FFMpeg Test
  
  Error   12  error C2143: syntax error : missing ';' before '{'  c:\ffmpeg\include\libavutil\mem.h   338 1   FFMpeg Test
  
  Error   15  error C2143: syntax error : missing ';' before '{'  c:\ffmpeg\include\libavutil\rational.h  54  1   FFMpeg Test
  
  Error   18  error C21in formal parameter list   c:\ffmpeg\include\libavutil\mem.h   338 1   FFMpeg Test
  
  Error   20  error C2085: 'av_q2d' : not in formal parameter list    c:\ffmpeg\include\libavutil\rational.h  80  1   FFMpeg Test
  
  Error   8   error C2085: 'av_mallocz_array' : not in formal parameter list  c:\ffmpeg\include\libavuormal parameter list    c:\ffmpeg\include\libavutil\rational.h  54  1   FFMpeg Test