ff_filter_alloc   697 libavfilter/avfilter.c     *filter_ctx = ff_filter_alloc(filter, inst_name);
ff_filter_alloc   196 libavfilter/avfiltergraph.c     s = ff_filter_alloc(filter, name);
ff_filter_alloc   371 libavfilter/internal.h AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name);