fprintf(stderr, "stack overflow in the parser\n");
av_log(NULL, AV_LOG_ERROR, "stack overflow in the parser\n");
static void push(Parser *p, double d){    if(p->stack_index+1>= STACK_SIZE){        fprintf(stderr, "stack overflow in the parser\n");        return;    }    p->stack[ p->stack_index++ ]= d;//printf("push %f\n", d); fflush(stdout);}