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• For WMV files avformat_find_stream_info() shows "Extra data : 8 bits left, value : 0" message

  15 avril 2013, par Mike

  When I call avformat_find_stream_info() for wmv files, the following message is always seen :
  [wmv3 00FAEAE0] Extra data : 8 bits left, value : 0

  After that the program works as expected but anyway I would like to know what does that message mean ? Thank you !

  File info (by ffmpeg -i) :

  Duration: 00:00:06.92, start: 0.000000, bitrate: 1514 kb/s
  
  Stream #0:0(rus): Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, stereo, fltp, 128 kb/s
  
  Stream #0:1(rus): Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 720x576, 1368 kb/s, SAR 16:15 DAR 4:3, 25 tbr, 1k tbn, 1k tbc

  Code :

  AVFormatContext*    pFormatCtx = avformat_alloc_context();
  
  if (avformat_open_input(&pFormatCtx, "file.wmv", NULL, NULL) < 0)
  
      return 0;
  
  if (avformat_find_stream_info(pFormatCtx, NULL) < 0) // HERE WE HAVE GOT THAT MESSAGE
  
      return 0;

• ffmpeg avformat_open_input always returns "Protocol not found" rv=(-1330794744)

  4 septembre 2013, par bzivkovic

  Trying to get ffmpeg working in Visual Studio 2010. So far all ffmpeg headers and libs are loaded, no error or warning occurs.

  avcodec_register_all();
  
  AVFormatContext *pFormatCtx = NULL;
  
  char errbuf[256];
  
  pFormatCtx = avformat_alloc_context();
  
  int rv = avformat_open_input(&pFormatCtx, "myfile.ext", NULL, NULL);
  
  if (rv!=0){                              
  
      av_strerror(rv, errbuf, sizeof(errbuf));
  
  }

  The problem is, avformat_open_input always returning -1330794744 (errbuf="Protocol not found"). Tried x86 & x64 headers and libs on 32bit XP and 64bit W7. Whatever I put for "myfile.ext" (tried "file1.avi", "file=c :\file1.avi", "http://www.someweb.com/file1.avi", and even empty char* "") response is always "Protocol not found". Any ideas ?

• VLC libx264 build error - "undefined reference to 'x264_encoder_open_128'"

  17 janvier 2013, par Tyler Scott

  Primary issue

  Steps to attempt to repeat this error.

  • Download latest git (git ://git.videolan.org/x264.git).
  • Run ./configure - You can use any options, the error is present with all.
  • Run sudo make - It will compile all of the code but when it comes time to link the code it runs into the error

    /usr/local/lib/libavcodec.a(libx264.o) : In function 'X264_init' :
    /.../libx264.c:418 : undefined reference to 'x264_encoder_open_128'

  This will then fall out and exit make. I have removed all apt packages relating to x264. I have searched my computer for any possible libraries that might be related and removed them. This problem persists. Can someone explain what is going wrong and the simplest way to solve this ?

  Additional info

  This error also shows up when building avconv. It also fails at linking time with the same error. So I can assume it is nothing wrong with that directory or source.