avfilter_formats_unref  223 libavfilter/avfilter.h void avfilter_formats_unref(AVFilterFormats **ref);
avfilter_formats_unref  154 libavfilter/avfiltergraph.c     avfilter_formats_unref(&link->in_formats);
avfilter_formats_unref  155 libavfilter/avfiltergraph.c     avfilter_formats_unref(&link->out_formats);