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• Using ffmpeg static libraries in an visual studio explress C++ 2010 project

  29 octobre 2015, par Yvo Götz

  As the title says, I have been trying to get ffmpeg/libav libraries to work in MSVC++ 2010.
  However, I keep running in the following error while coding on debug mode.

  code :

  extern "C" 
  
  {
  
      #ifndef __STDC_CONSTANT_MACROS
  
      #define __STDC_CONSTANT_MACROS
  
      #endif
  
      #include 
  
      #include 
  
      #include 
  
      #include 
  
  }
  
  int main( int argc, char* argv[] ) 
  
  {
  
      av_register_all();
  
      return 0;
  
  }

  console :

  1>------ Build started: Project: ffmpeg, Configuration: Debug Win32 ------
  
  1>ffmpeg.obj : error LNK2019: unresolved external symbol _av_register_all referenced in       function _main
  
  1>C:\Users\okki\documents\visual studio 2010\Projects\ffmpeg\Debug\ffmpeg.exe : fatal    error LNK1120: 1 unresolved externals
  
  ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

  I used zeranoe’s latest build git-56ba331 (2013-05-14).

  And I have tried the following to fix this :

  • configuring the project to look for both the x64 and x86 libraries.
  • Add the DLLs from the ’shared’ package to both library folders.
  • Add the library directory to both the linker options and VC++ Directories.

  I have been stuck on this for a while, and any suggestion can help.
  If any extra info is needed I will happily provide.

• ffmpeg PNG - MP4 - Error opening input files : invalid argument

  15 mai 2013, par Max Savage Kramer

  I am following along with this
  visualization project
  converting PNG files in an MP4.

  The only change from the code on the example is that my time stamp starts with
  1.

  ffmpeg -r 20 -b 20M -i example%01d.png output.mp4
  

  And this is what returns

  ffmpeg version N-53055-g7b43120 Copyright (c) 2000-2013 the FFmpeg developers
  built on May 14 2013 20:43:53 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  configuration : —disable-yasm
  libavutil      52. 31.100 / 52. 31.100
  libavcodec     55.  9.100 / 55.  9.100
  libavformat    55.  7.100 / 55.  7.100
  libavdevice    55.  0.100 / 55.  0.100
  libavfilter     3. 67.100 /  3. 67.100
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  **Option b (video bitrate (please use -b:v)) cannot be applied to input file
  example%01d.png — you are trying to apply an input option to an output file or
  vice versa. Move this option before the file it belongs to.
  Error parsing options for input file example%01d.png.
  Error opening input files : Invalid argument**
  

• Logic and lawyers

  22 mai 2013, par Mans — Law and liberty

  Reading about various patent litigation cases, I am struck by the frequency with which common logical fallacies such as the Appeal to Consequences are committed. We shall look at a couple of recent examples. In conjunction with the Federal Circuit ruling in CLS Bank v. Alice Corp., Judge Moore, joined … Continue reading →