obj_meta = (NvDsObjectMeta *) (l_obj->data);
        gint src_left = GST_ROUND_UP_2((unsigned int)obj_meta->rect_params.left);
        gint src_top = GST_ROUND_UP_2((unsigned int)obj_meta->rect_params.top);
        gint src_width = GST_ROUND_DOWN_2((unsigned int)obj_meta->rect_params.width);
        gint src_height = GST_ROUND_DOWN_2((unsigned int)obj_meta->rect_params.height);
       std::cout<< "exmaple: "<< frame_meta->frame_num<< " "<< src_left <<","<< src_top<<","<< src_width<<","<< src_height<<","<<std::endl;