avfilter_open     573 libavfilter/avfilter.h AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name);
avfilter_open     120 libavfilter/avfiltergraph.c                         avfilter_open(avfilter_get_by_name("scale"),inst_name);
avfilter_open     140 libavfilter/graphparser.c     filt_ctx = avfilter_open(filt, inst_name);