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• avcodec/videotoolboxenc : Check and set hevc profile

  12 octobre 2023, par Zhao Zhili

  avcodec/videotoolboxenc : Check and set hevc profile
  1. If user don't specify the profile, set it to main10 when pixel
  
     format is 10 bits. Before the patch, videotoolbox output main
  
     profile bitstream with 10 bit input, which can be confusing.
  
  2. Warning when user set profile to main explicitly with 10 bit
  
     input. It works, but not the best choice.
  
  3. Reject main 10 profile with 8 bit input, it doesn't work.
  Signed-off-by : Zhao Zhili <zhilizhao@tencent.com>
  

  • [DH] libavcodec/videotoolboxenc.c

• unresolved external symbol of ffmpeg avutil.lib

  2 mai 2016, par Richard

  For some reason I can not get rid of this Linker error when using methods from ffmpeg libs !
  I built the ffmpeg libs myself with msys64 and linked the resulting libs to my current project. As soon as I want to use them I get about 10 LNK errors.
  I think I set all required linking right and also use the key word extern "C" without any success.
  When running dumpbin.exe it lists all used symbols, so those libs should be ok...
  Does anyone have a clue what´s going wrong ?

  #pragma once
  
  
  
  extern "C"
  
  {
  
  #include 
  
  #include 
  
  #include 
  
  #include 
  
  #include 
  
  #include 
  
  #include 
  
  }
  
  
  
  int main(int argc, char **argv[])
  
  {
  
  const char *output_type;
  
  /* register all the codecs */
  
  avcodec_register_all();
  
  
  
  return 0;
  
  }

  The error log looks like this :

  error LNK2019 : unresolved external symbol av_frame_free referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
  error LNK2019 : unresolved external symbol avcodec_register_all referenced in function main
  error LNK2019 : unresolved external symbol avcodec_alloc_context3 referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
  error LNK2019 : unresolved external symbol avcodec_open2 referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
  error LNK2019 : unresolved external symbol avcodec_close referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
  error LNK2019 : unresolved external symbol av_init_packet referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
  error LNK2019 : unresolved external symbol av_packet_unref referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
  error LNK2019 : unresolved external symbol avcodec_find_encoder referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
  error LNK2019 : unresolved external symbol avcodec_encode_video2 referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
  error LNK2019 : unresolved external symbol av_image_alloc referenced in function "void __cdecl video_encoding(char const *,int)" (?video_encoding@@YAXPEBDH@Z)
  oVideoRendererApp\x64\Debug_64\ImagesToVideoRendererApp.exe : fatal error LNK1120 : 14 unresolved externals

• How to link all object files in a folder when compiling C ?

  23 septembre 2018, par Truman Purnell

  So I have two folders :

  /ffmpeg
  /myproj

  Inside myproj I have a main method :

  #include 
  
  #include 
  
  #include "libavformat/avformat.h"
  
  #include "libavcodec/avcodec.h"
  
  
  
  int main(int argc, char *argv[])
  
  {
  
      AVFormatContext *pFormatCtx = NULL;
  
  
  
      if (avformat_open_input(&pFormatCtx, argv[1], NULL, 0) != 0)
  
          return -1;
  
  
  
      return EXIT_SUCCESS;
  
  }

  I am attempting to compile this file like so :

  cc main.c -I../ffmpeg ../ffmpeg/libavformat/utils.o

  and am receiving this error :

  "_ffio_set_buf_size", referenced from:
  
  _ff_configure_buffers_for_index in utils.o
  
  ld: symbol(s) not found for architecture x86_64

  I understand what it’s saying - I need to include the dependencies of utils.o, stored in file utils.d. But how do I do that on the command line ? There are tons, tons, tons of dependencies and I know people don’t type these manually !