void avfilter_unref_buffer(AVFilterBufferRef *ref)
{
    if(!(--ref->buf->refcount))
        ref->buf->free(ref->buf);
    av_free(ref->video);
    av_free(ref);
}
['void avfilter_end_frame(AVFilterLink *link)\n{\n    void (*end_frame)(AVFilterLink *);\n    if(!(end_frame = link_dpad(link).end_frame))\n        end_frame = avfilter_default_end_frame;\n    end_frame(link);\n    if(link->src_buf) {\n        avfilter_unref_buffer(link->src_buf);\n        link->src_buf = NULL;\n    }\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}']