+int init_complex_filtergraph(FilterGraph *fg)
+{
+ AVFilterInOut *inputs, *outputs, *cur;
+ AVFilterGraph *graph;
+ int ret = 0;
+
+ /* this graph is only used for determining the kinds of inputs
+ * and outputs we have, and is discarded on exit from this function */
+ graph = avfilter_graph_alloc();
+ if (!graph)
+ return AVERROR(ENOMEM);
+
+ ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
+ if (ret < 0)
+ goto fail;
+
+ for (cur = inputs; cur; cur = cur->next)
+ init_input_filter(fg, cur);
+
+ for (cur = outputs; cur;) {
+ GROW_ARRAY(fg->outputs, fg->nb_outputs);
+ fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
+ if (!fg->outputs[fg->nb_outputs - 1])
+ exit_program(1);
+
+ fg->outputs[fg->nb_outputs - 1]->graph = fg;
+ fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
+ fg->outputs[fg->nb_outputs - 1]->type = avfilter_pad_get_type(cur->filter_ctx->output_pads,
+ cur->pad_idx);
+ cur = cur->next;
+ fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
+ }
+
+fail:
+ avfilter_inout_free(&inputs);
+ avfilter_graph_free(&graph);
+ return ret;
+}
+