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• Segmentation fault when media played using libavcodec

  20 août 2013, par sarah john

  Myself trying to play media using libavcodec as backend.I downloaded ffmpeg-2.0.1 and installed using ./configure,make and make install.
  While trying to run an application to play an audio file, i'm getting segmentation fault while checking for the first audio stream.my program is like

  AVFormatContext* container = avformat_alloc_context();
  
  if (avformat_open_input(&container, input_filename, NULL, NULL) < 0) {
  
      die(“Could not open file”);
  
  }
  
  
  
  if (av_find_stream_info(container) < 0) {
  
      die(“Could not find file info”);
  
  }
  
  
  
  av_dump_format(container, 0, input_filename, false);
  
  int stream_id = -1;
  
  int i;
  
  
  
  for (i = 0; i < container->nb_streams; i++) {
  
      if (container->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO) {
  
          stream_id = i;
  
          break;
  
      }
  
  }

  Segmentation fault occurs at if(container->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO)

  How can i fix this ? I am working in ubuntu 12.04.

• FFmpeg .jpg images to .mp4 incompatible with Windows Media Player

  8 janvier 2020, par willspill

  I have a series of 10 images with which I am trying to form an animation. I have used the following code below in the command line :

  ffmpeg -f image2 -i plot-%03d.jpg -r 5 -pix_fmt yuv420p -vcodec mpeg4 output.mp4

  This creates a .mp4 file with a seemingly valid file size, however, when trying to open with Windows Media Player gives the following error :

  Windows Media Player cannot play the file. The Player might not support the file type or might not support the codec that was used to compress the file.

  I have tried many solutions from previous threads but have found no solution. I have checked that my version of windows media player is compatible with mp4, avi, wmv etc. and have tried all of these outputs also. Any ideas of the issue ?

  The full code :

  M:Example\Frames_plot-001_jpg>ffmpeg -f image2 -i plot-%03
  
  ix_fmt yuv420p -vcodec mpeg4 output.mp4
  
  FFmpeg version SVN-r11200, Copyright (c) 2000-2007 Fabrice Bellard,
  
    configuration: --enable-memalign-hack
  
    libavutil version: 49.5.0
  
    libavcodec version: 51.48.0
  
    libavformat version: 52.1.0
  
    built on Dec 11 2007 14:33:27, gcc: 3.4.5 (mingw special)
  
  Input #0, image2, from 'plot-%03d.jpg':
  
    Duration: 00:00:00.4, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: mjpeg, yuvj420p, 4167x4167 [PAR 120:120 DAR
  
  tb(r)
  
  Output #0, mp4, to 'output.mp4':
  
      Stream #0.0: Video: mpeg4, yuv420p, 4167x4167 [PAR 1:1 DAR 1:1]
  
   kb/s,  5.00 tb(c)
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press [q] to stop encoding
  
  Compiler did not align stack variables. Libavcodec has been miscomp
  
  and may be very slow or crash. This is not a bug in libavcodec,
  
  but in the compiler. You may try recompiling using gcc >= 4.2.
  
  Do not report crashes to FFmpeg developers.
  
  frame=    3 fps=  3 q=4.0 Lsize=     917kB time=0.6 bitrate=12522.6
  
  video:916kB audio:0kB global headers:0kB muxing overhead 0.072455%

• ffmpeg_filter : check that the input media type match the filter

  14 août 2013, par Michael Niedermayer

  ffmpeg_filter : check that the input media type match the filter
  Fixes Ticket2012
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] ffmpeg_filter.c