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• COMPILATION ISSUES : FFMPEG CODE ON VS2012

  7 novembre 2013, par user2964667

  I have downloaded FFMPEG source code(c code) by the following link

  http://ffmpeg.zeranoe.com/builds/

  After that,I have completed the configuration part then i was generated and linked the library files *[avcodec-54.lib,avdevice-54.lib,avfilter-3.lib,avformat-54.lib,avutil-52.lib,swresample-0.lib,swscale-2.lib ]*on Microsoft Visual Studio C++ by creating a new project by including all .c and header files.

  Referred Links :
  http://www.ffmpeg.org/platform.html#Microsoft-Visual-C_002b_002b-or-Intel-C_002b_002b-Compiler-for-Windows

  When I was compiling on Visual studio 2010... I am getting more than 300 errors under all the files libavcodec,libavdevice,libavfilter,libavformat,libavresample,libavutil,libpostproc,libswresample,libswscale like

  ASM ERRORS :

  error C2400: inline assembler syntax error in 'opcode'; found 'data type'
  
  error C2065: '__asm__' : undeclared identifier
  
  error C2143: syntax error : missing ';' before 'volatile'

  SYNTAX ERRORS :

  error C2143: syntax error : missing '}' before '.'
  
  error C2143: syntax error : missing ';' before '.'
  
  error C2059: syntax error : '.'
  
  error C2143: syntax error : missing ';' before '}'
  
  error C2059: syntax error : '}'
  
  error C2143: syntax error : missing ';' before '{'
  
  error C2447: '{' : missing function header (old-style formal list?)
  
  error C2059: syntax error : ','
  
  error C2143: syntax error : missing ';' before '{'
  
  error C2447: '{' : missing function header (old-style formal list?)

  Please anyone let me know how to compile a ffmpeg c code on vs2010 successfully.

• Problems in my sample C code using FFmpeg API

  11 juillet 2019, par Tina J

  I’ve been trying to change an FFmpeg’s example code HERE to call other filters using its C APIs. Say the filter be freezedetect=n=-60dB:d=8 which normally runs like this :

  ffmpeg -i small.mp4 -vf "freezedetect=n=-60dB:d=8" -map 0:v:0 -f null -

  And prints outputs like this :

  [freezedetect @ 0x25b91c0] lavfi.freezedetect.freeze_start: 5.005
  
  [freezedetect @ 0x25b91c0] lavfi.freezedetect.freeze_duration: 2.03537
  
  [freezedetect @ 0x25b91c0] lavfi.freezedetect.freeze_end: 7.04037

  However, the original example displays frames, not these metadata information. How can I change the code to print this metadata information (and not the frames) ?

  I’ve been trying to change the display_frame function below into a display_metadata function. Looks like the frame variable has a metadata dictionary which looks promising, but my attempts failed to use it. I’m also new to C language.

  Original display_frame function :

  static void display_frame(const AVFrame *frame, AVRational time_base)
  
  {
  
      int x, y;
  
      uint8_t *p0, *p;
  
      int64_t delay;
  
  
  
      if (frame->pts != AV_NOPTS_VALUE) {
  
          if (last_pts != AV_NOPTS_VALUE) {
  
              /* sleep roughly the right amount of time;
  
               * usleep is in microseconds, just like AV_TIME_BASE. */
  
              delay = av_rescale_q(frame->pts - last_pts,
  
                                   time_base, AV_TIME_BASE_Q);
  
              if (delay > 0 && delay < 1000000)
  
                  usleep(delay);
  
          }
  
          last_pts = frame->pts;
  
      }
  
  
  
      /* Trivial ASCII grayscale display. */
  
      p0 = frame->data[0];
  
      puts("\033c");
  
      for (y = 0; y < frame->height; y++) {
  
          p = p0;
  
          for (x = 0; x < frame->width; x++)
  
              putchar(" .-+#"[*(p++) / 52]);
  
          putchar('\n');
  
          p0 += frame->linesize[0];
  
      }
  
      fflush(stdout);
  
  }

  My new display_metadata function that needs to be completed :

  static void display_metadata(const AVFrame *frame)
  
  {
  
  
  
  //    printf("%d\n",frame->height);
  
  
  
      AVDictionary* dic = frame->metadata;
  
  
  
      printf("%d\n",*(dic->count));
  
  
  
  //    fflush(stdout);
  
  } 

• Revision 39383 : La récupération du logo depuis le document original passe à la fin de ...

  20 juillet 2010, par kent1@… — Log

  La récupération du logo depuis le document original passe à la fin de l’encodage