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• FFMPEG Undefined Reference to 'avcodoec_open2' in C++

  12 avril 2012, par ALM865

  I have an error when compiling one of my C++ programs after updating the FFMPEG library from 0.8 to 'ffmpeg version git-2012-04-12-277f20c'

  The error I get when I make my program is as follows :

  -------- begin --------
  
  Linking: Analysing_Server
  
  ./source/Encoding_Thread.o: In function `CEncoding_Thread::do_work()':
  
  /home/Analyser/source/Encoding_Thread.cpp:155: undefined reference to `avcodec_open2'
  
  collect2: ld returned 1 exit status
  
  make: *** [Analysing_Server] Error 1

  The relevant lines of my Make file is similar to running g++ as below :

  g++ test2.cpp -lavformat -lavcodec -lavutil -D__STDC_CONSTANT_MACROS

  A stripped down version of my relevant CPP code that throws the error is :

  #include 
  
  #include  
  
  
  
  #define LOG_OUT_STREAM_BUFF_SIZE  200000
  
  
  
  
  
  extern "C"  {
  
    /* The ffmpeg library is completely written in C, so we need to tell the C++ compiler that so it links correctly. */
  
    #include "stdint.h"
  
    #include "libavcodec/avcodec.h"
  
    #include "libavutil/mathematics.h"
  
    #include "libswscale/swscale.h"
  
    #include "libavfilter/avfilter.h"
  
  
  
    int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
  
    int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr);
  
  }
  
  
  
  uint8_t m_outbuf[2][LOG_OUT_STREAM_BUFF_SIZE];
  
  unsigned int m_out_size[2];
  
  unsigned int m_OutBuffer_ID[2];
  
  unsigned int m_Buffer_ID; /* This is just a uniqueish stamp we give to each buffer so we can tell when they change.. */
  
  
  
  AVCodecContext * m_CodecContex;
  
  AVCodec * m_codec;
  
  struct SwsContext *m_img_convert_ctx;
  
  
  
  unsigned char* m_DataBuff;
  
  
  
  int Output_Width, Output_Height;
  
  int Output_Bitrate;
  
  
  
  
  
  int main(void) {
  
    //New version of FFMPEG calls this in avcodec_register_all
  
    //avcodec_init();
  
  
  
    /* register all the codecs */
  
    avcodec_register_all();
  
  
  
    /* Initalise the encoder */
  
    m_codec = avcodec_find_encoder(CODEC_ID_MP2);
  
  
  
    if (!m_codec) {
  
      printf("Encoding codec not found\n");
  
    }
  
  
  
    /* init the pointers.. */
  
    m_CodecContex = NULL;
  
  
  
    /* Default values.. */
  
    Output_Width = 1600;
  
    Output_Height = 1200;
  
    Output_Bitrate = 600000;
  
  
  
    /* Create/setup the Codec details.. */
  
    //Changed to work with new FFMPEG
  
    m_CodecContex = avcodec_alloc_context3(m_codec);
  
    avcodec_get_context_defaults3(m_CodecContex, m_codec);
  
  
  
    /* put sample parameters */
  
    m_CodecContex->bit_rate = Output_Bitrate;
  
    /* resolution must be a multiple of two */
  
  
  
    m_CodecContex->width = Output_Width;
  
    m_CodecContex->height = Output_Height;
  
    /* frames per second */
  
    m_CodecContex->time_base= (AVRational){1,25};
  
  
  
    m_CodecContex->gop_size = 10; /* emit one intra frame every ten frames */
  
    m_CodecContex->max_b_frames=1;
  
    m_CodecContex->pix_fmt = PIX_FMT_YUV420P; /* must be YUV for encoding.. */
  
  
  
  
  
    AVDictionary * RetunedAVDic;
  
  
  
    /* open it */
  
    //Changed to work with new FFMPEG
  
    if (avcodec_open2(m_CodecContex, m_codec, &RetunedAVDic) < 0) {
  
        printf("could not open codec");
  
    }
  
  }

  Unfortunately the example under 'doc/examples/decoding_encoding.c' that comes with FFMPEG no longer works because all the functions that it uses are now depreciated. My code is based on the example code and worked fine with FFMPEG 0.8 but does not compile with the newest version of FFMPEG. I have changed some of the depreciated functions to their newer versions but it still doesn't compile.

  Does anyone know why I am getting this error ? or does anyone have a link to an example like 'doc/examples/decoding_encoding.c' using the newest version of FFMPEG ?

• Revision baedcedcbe : Reset Q for key frame when spatial resizing occurs. The logic for spatial resiz

  6 juin 2012, par Marco Paniconi

  Changed Paths : Modify /vp8/encoder/onyx_if.c Reset Q for key frame when spatial resizing occurs. The logic for spatial resizing is done after the Q is selected for the frame. This causes a problem that the Q we select for the (resized) key frame may be based on a different resolution than the (...)

• Anomalie #2728 : js de login déficient sous opera 11.64

  7 juin 2012, par marcimat -

  C’est une drôle de résolution ? HTML5 est activé par défaut en 3.1 ?? ou c’est vous qui l’aviez activé dans votre config ?