ff_free_filters   379 libswscale/slice.c     ff_free_filters(c);
ff_free_filters  1011 libswscale/swscale_internal.h int ff_free_filters(SwsContext *c);
ff_free_filters  1509 libswscale/utils.c         ff_free_filters(c2);
ff_free_filters  2374 libswscale/utils.c     ff_free_filters(c);