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• Trying to link Mingw-w64 compiled FFMpeg libraries in Visual Studio

  16 juin 2014, par LostBoy

  I’m trying to use the FFMpeg libraries in a Windows application. I use MingW-w64 to compile FFMpeg with static libraries with architecture once with x86 and once with x86_64.
  Currently I’m trying to link the 32bit x86 libraries with my VS2008 application.
  The libraries are added to the library path and VS does not complain about being unable to load a .a file.

  However I get several uneresolved symbol errors like
  ait_rtp_receiver.lib(ait_decoder_lib.obj) : error LNK2001 : unresolved external symbol _av_free

  I import the FFMpeg header files as extern C and I can see the symbols in the .a without the leading underscore.
  What can I do to make the name decoration of Mingw-w64’s gcc and of the VS compiler suite compatible ?

• Assertion error when encoding video using ffmpeg library on visual studio c++

  18 juin 2015, par Leon Phan

  I have a project, that i need to received data from a rtsp link, decode,resize video, encode it and save to .mp4 file.

  • I Using ffmpeg from http://ffmpeg.zeranoe.com/builds/
  • I am using visual studio 2010, run on windows 7 and windows 8.
  • This is rtsp link i am using : rtsp ://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov
  • I decode and save to ppm file is ok. But encode isn’t.
  • I following there tutorials : http://dranger.com/ffmpeg/tutorial01.html

  this is my code :

  AVPacket destPacket;
  
  av_init_packet(&destPacket);
  
  destPacket.data = NULL;
  
  destPacket.size = 0;
  
  while(av_read_frame(i_format_context, &packet)>=0) {
  
      if(packet.stream_index==video_stream_index) {
  
          int rest = avcodec_decode_video2(copyInputCodec, pFrame, &frameFinished, &packet);
  
          if(frameFinished) {
  
              av_init_packet(&destPacket);
  
              destPacket.data = NULL;
  
              destPacket.size = 0;
  
              av_free_packet(&destPacket);
  
              //deocde here
  
              int ret_scale = sws_scale(sws_ctx,pFrame->data,pFrame->linesize,0,copyInputCodec->height,encodeFrame->data,encodeFrame->linesize);
  
              encodeFrame->pts=i;
  
              int ret_enc = avcodec_encode_video2(copyOutputCodec,&destPacket,encodeFrame,&encodeFinishsed);//<--- Problem here.
  
              getchar();
  
          }
  
      }
  
  }

  And this is output error

  [swscaler @ 00607880] Warning : data is not aligned ! This can lead to a
  speedlo ss
  Assertion avctx->codec->encode2 failed at /home/kyle/software/ffmpeg/source/ffmp
  eg-git/libavcodec/utils.c:2134

  I try to run many sample code to encode video, the result is same.

  Thanks for help.

  PS : sorry about my English skill.

• Why is Visual Studio executing the wrong code [closed]

  15 mai 2023, par Jacob

  Not sure what is going on here. Code that I have deleted is still executing. I am sending parameters to FFMPEG for video editing. FFMPEG is then processing parameters that I previously sent, which is now deleted. While trying to figure this out, I sent the string "WTF !" directly to the FFMPEG parameters and FFMPEG is still processing the video with old parameters. The string "WTF !" should have broke FFMPEG so it is clearly executing the wrong code. Hasd anyone ever encountered this ?