+int avfilter_graph_add_filter(AVFilterGraph *graphctx, AVFilterContext *filter);
+
+/**
+ * Check for the validity of \p graph.
+ *
+ * A graph is considered valid if all its input and output pads are
+ * connected.
+ *
+ * @return 0 in case of success, a negative value otherwise
+ */
+int avfilter_graph_check_validity(AVFilterGraph *graphctx, AVClass *log_ctx);
+
+/**
+ * Configure the formats of all the links in the graph.
+ */
+int avfilter_graph_config_formats(AVFilterGraph *graphctx);