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• swscale : don't omit ff_sws_init_range_convert for high-bit

  28 octobre 2023, par Niklas Haas

  swscale : don't omit ff_sws_init_range_convert for high-bit
  This was a complete hack seemingly designed to work around a different
  
  bug, which was fixed in the previous commit. As such, there is no more
  
  reason not to do this, as it simply breaks changing color range in
  
  sws_setColorspaceDetails for no reason.
  

  • [DH] libswscale/utils.c

• How to overlay 2 videos at different time over another video in single ffmpeg command ?

  17 mars 2018, par Qandeel Abbasi

  Using ffmpeg command line I want to overlay 2 different videos on top of another (main video) at different time for different duration. I have successfully overlayed 1 video over the main video at specific time and for specific duration using following command :

  ffmpeg -i main.mp4 -i first.mp4 \
  
  -filter_complex "[1:v]setpts=PTS-32/TB[a]; \
  
                   [0:v][a]overlay=enable=gte(t\,5):eof_action=pass[out]; \
  
                   [1] scale=480:270 [over]; [0][over] overlay=400:400" \
  
  -map [out] -map 0:a \
  
  -c:v libx264 -crf 18 -pix_fmt yuv420p \
  
  -c:a copy \
  
  output.mp4

  How can i modify the same command to apply the same operations on two secondary videos at the same time ?

• _stricoll is unsolved while linking the libmingwex.a with vs2010

  14 mai 2018, par damantou

  I am tending to build some app which staticly links the ffmpeg libs on windows 8. I have successfully build the static lib of ffmpeg in mingw/msys env on windows 8. Then I use cmake to generate the vs2010 project to start work with my app.

  While I am trying to build the first dead simple main program, I got quite some link errors.

  extern "C" {
  
  
  
  // to work around error:
  
  // 'UINT64_C': identifier not found
  
  #ifndef __STDC_CONSTANT_MACROS
  
  #define __STDC_CONSTANT_MACROS
  
  #endif
  
  
  
  
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  
  
  }
  
  
  
  
  
  int main(int argc, char *argv[])
  
  {
  
      av_register_all();
  
      return 0;
  
  }

  After struggling with a bunch of unresolved symbols, I come up with the following libraries to link with in order :

  c:/MinGW/mingw32/lib/libiconv.a
  
  libavcodec.a
  
  libavdevice.a
  
  libavfilter.a
  
  libavformat.a
  
  libavutil.a
  
  libswresample.a
  
  libswscale.a
  
  c:/MinGW/lib/gcc/mingw32/4.8.1/libgcc.a
  
  c:/MinGW/mingw32/lib/libws2_32.a
  
  c:/MinGW/mingw32/lib/libmingw32.a
  
  c:/MinGW/mingw32/lib/libmingwex.a

  Finally there is one unresolved symbol issue not able to fix :

  libmingwex.a(glob.o) : error LNK2019: unresolved external symbol 
  
                         _stricoll referenced in function _glob_match

  I tried to add some a fake function, but still not help :(

  int  __cdecl _stricoll(_In_z_  const char * _Str1, _In_z_  const char * _Str2)
  
  {
  
      return 0;
  
  };

  I googled it the whole morning, but nobody ever mentioned this problem. I guess there should be simple reason and solution for this, maybe because of my ignorance on simple knowledge.