func: static AVStream * init_stream(AVFormatContext *s)
  
  {
  
      BinDemuxContext *bin = s->priv_data;
  
      AVStream *st = avformat_new_stream(s, NULL);
  
      if (!st)
  
          return NULL;
  
      st->codec->codec_tag   = 0;
  
      st->codec->codec_type  = AVMEDIA_TYPE_VIDEO;
  
  
  
      if (!bin->width) {
  
          st->codec->width  = (80<<3);
  
          st->codec->height = (25<<4);
  
      }
  
  
  
      avpriv_set_pts_info(st, 60, bin->framerate.den, bin->framerate.num);
  
  
  
      /* simulate tty display speed */
  
      bin->chars_per_frame = FFMAX(av_q2d(st->time_base) * bin->chars_per_frame, 1);
  
  
  
      return st;
  
  }
  