av_expr_count_func  299 libavfilter/vf_geq.c         av_expr_count_func(geq->e[plane][0], counter, FF_ARRAY_ELEMS(counter), 2);
av_expr_count_func  111 libavutil/eval.h int av_expr_count_func(AVExpr *e, unsigned *counter, int size, int arg);