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

  23 septembre 2013, par damantou

  Brief answer :

  In MinGW libs, the symbol _stricoll is defined in libmoldname100.a.

  Question :

  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.

• ffmpeg : memory not freed on multi-threaded decoding

  31 mai 2020, par toby_e

  I am developing a video player based on the ffmpeg libraries and have run into a rather strange memory increase or failure to decrease memory when unloading a video file. My code is based on various examples of demuxing, decoding and scaling video and audio frames - but with the excecption that i have put each of these steps into seperate threads to avoid waiting for time-consuming calls. Everything works perfectly, but Visual Studio shows that Process Memory does not decrease when i call the various avclose and avfree calls. My Windows task manager confirms these memory increases that continue into the gigabyes !

  



  My player is roughly made up by two clases with the following calls to the ffmpeg libraries :

  



  —

  



  READER :

  



  Open (on main thread) : avformat_open_input(), avformat_find_stream_info()

  



  Read (on seperate thread) : av_read_frame()

  



  Close (on main thrad) : avformat_close_input()

  



  DECODER :

  



  Open (on main thread) : avcodec_find_decoder(), avcodec_alloc_context3(), avcodec_parameters_to_context(), avcodec_open2()

  



  Decode (on seperate thread) : avcodec_send_packet(), avcodec_receive_frame()

  



  Close (on main thread) : avcodec_free_context()

  



  —

  



  Is threre any issues with opening/closing on the main thread and reading/deconding on other threads ?

  


• Live Video Chat for iPhone and HTTP Live Streaming

  14 janvier 2024, par mayuur

  I want to make an app which has video chat functionality for iPhone. But after many searches, I am still not able to find any successful results. Is there any public or even for that matter, private API available for doing this on iPhone ? If you have an YES answer, please help me.

  


  Basically, what I want is to read the streams of the video on both the devices connected for chatting. Please help me if you can.

  


  p.s - I have already checked iDoubs but it failed and always shows some unknown problem and for that reason, doesn't allow me to connect to anyone.

  


  ALSO : The suggested method I have found is via HTTP Live Streaming. But, in that too, I have multiple doubts.

  


  1.) I need to find how do I upload my video from iPhone to the HTTP server from where I would be broadcasting ?

  


  2.) Can you please post something related to setting up the server ? How do I feed the video to the FFMPEG Server ?

  


  Mainly, I need to find the upload method. I am right now simply sending hex-code in the form of NSDATA to the server and I am stuck there. The main problem is, It is live. How do I handle that ?

  


  It would be best, if you could help me make the iDoubs work properly.