void avfilter_unref_buffer(AVFilterBufferRef *ref)
{
    if(!(--ref->buf->refcount))
        ref->buf->free(ref->buf);
    av_free(ref->video);
    av_free(ref);
}
['static void end_frame(AVFilterLink *link)\n{\n    avfilter_end_frame(link->dst->outputs[0]);\n    avfilter_unref_buffer(link->cur_buf);\n}', 'void avfilter_unref_buffer(AVFilterBufferRef *ref)\n{\n    if(!(--ref->buf->refcount))\n        ref->buf->free(ref->buf);\n    av_free(ref->video);\n    av_free(ref);\n}']