func: void ff_er_frame_start(ERContext *s)
  
  {
  
      if (!s->avctx->err_recognition)
  
          return;
  
  
  
      memset(s->error_status_table, ER_MB_ERROR | VP_START | ER_MB_END,
  
             s->mb_stride * s->mb_height * sizeof(uint8_t));
  
      s->error_count    = 3 * s->mb_num;
  
      s->error_occurred = 0;
  
  }
  