+ * Free a graph, destroy its links, and set *graph to NULL.
+ * If *graph is NULL, do nothing.
+ */
+void avfilter_graph_free(AVFilterGraph **graph);
+
+/**
+ * A linked-list of the inputs/outputs of the filter chain.
+ *
+ * This is mainly useful for avfilter_graph_parse(), since this
+ * function may accept a description of a graph with not connected
+ * input/output pads. This struct specifies, per each not connected
+ * pad contained in the graph, the filter context and the pad index
+ * required for establishing a link.
+ */
+typedef struct AVFilterInOut {
+ /** unique name for this input/output in the list */
+ char *name;
+
+ /** filter context associated to this input/output */
+ AVFilterContext *filter_ctx;
+
+ /** index of the filt_ctx pad to use for linking */
+ int pad_idx;
+
+ /** next input/input in the list, NULL if this is the last */
+ struct AVFilterInOut *next;
+} AVFilterInOut;
+
+/**
+ * Add a graph described by a string to a graph.
+ *
+ * @param graph the filter graph where to link the parsed graph context
+ * @param filters string to be parsed
+ * @param inputs linked list to the inputs of the graph
+ * @param outputs linked list to the outputs of the graph
+ * @return zero on success, a negative AVERROR code on error