avfilter_graph_add_filter  129 libavfilter/avfiltergraph.c                     if (avfilter_graph_add_filter(graph, scale) < 0)
avfilter_graph_add_filter   47 libavfilter/avfiltergraph.h int avfilter_graph_add_filter(AVFilterGraph *graphctx, AVFilterContext *filter);
avfilter_graph_add_filter  147 libavfilter/graphparser.c     if(avfilter_graph_add_filter(ctx, filt_ctx) < 0) {