ff_avfilter_default_free_buffer  103 libavfilter/audio.c     samplesref->buf->free   = ff_avfilter_default_free_buffer;
ff_avfilter_default_free_buffer  167 libavfilter/internal.h void ff_avfilter_default_free_buffer(AVFilterBuffer *buf);
ff_avfilter_default_free_buffer   74 libavfilter/video.c     picref->buf->free = ff_avfilter_default_free_buffer;