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• lavf : make overlay_qsv work based on framesync

  3 avril 2018, par Ruiling Song

  lavf : make overlay_qsv work based on framesync
  The existing version which was cherry-picked from Libav does not work
  
  with FFmpeg framework, because ff_request_frame() was totally
  
  different between Libav (recursive) and FFmpeg (non-recursive).
  
  The existing overlay_qsv implementation depends on the recursive version
  
  of ff_request_frame to trigger immediate call to request_frame() on input pad.
  
  But this has been removed in FFmpeg since "lavfi : make request_frame() non-recursive."
  
  Now that we have handy framesync support in FFmpeg, so I make it work
  
  based on framesync. Some other fixing which is also needed to make
  
  overlay_qsv work are put in a separate patch.
  Signed-off-by : Ruiling Song <ruiling.song@intel.com>
  

  • [DH] libavfilter/Makefile
  • [DH] libavfilter/vf_overlay_qsv.c

• _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.

• How to configure ffmpeg for streaming videos from Red5 into Youtube using youtube-v3-api ?

  28 mai 2018, par Alfonso Valdes

  You’ll see my problem is next :

  Currently I’m working to configure youtube-v3-api for live streaming of .flv videos on my Youtube channel using Red 5 service as stated on next link https://www.red5pro.com/docs/server/ffmpegstreaming.html, this is using next commands for streaming on Linux :

  ffmpeg  -i rtmp://127.0.0.1:1935/live/streamname live=1 timeout=2 -vcodec libx264 -s 640x480 -vb 500k -acodec libfdk_aac -ab 128k  -f flv rtmp://a.rtmp.youtube.com/live2/{Stream name/key}
  
  
  
  
  
  ffmpeg -rtsp_transport tcp -i rtsp://127.0.0.1:8554/live/streamname -acodec copy -vcodec copy -f flv rtmp://a.rtmp.youtube.com/live2/{Stream name/key}

  On this, neither RMTP nor RTSP protocols are working for streaming. Also, I have tried several codecs for audio and video configuring different sizes for each one of them, but none of those have worked.

  The root streaming videos are generated by an IOS/Android app still on development phase.

  The problem comes when no video is displayed on Youtube screen, regardless the video is being sent by Red5 (I confirmed this on my Red5 dedicated server on AWS) and received correctly by Youtube (confirmed by validating on Console), so I have come into a dead end on which I hope you could help me get through.

  Any idea of what could be a possible solution ?

  Thank you.