libavfilter/vf_split.c:90: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned32 by call to `avfilter_unref_buffer`.

libavfilter/vf_split.c:90:5: Call
88.         avfilter_end_frame(ctx->outputs[i]);
89. 
90.     avfilter_unref_buffer(inlink->cur_buf);
        ^
91. }
92. 

libavfilter/avfilter.c:73:1: <LHS trace>
71. }
72. 
73. void avfilter_unref_buffer(AVFilterBufferRef *ref)
    ^
74. {
75.     if (!ref)

libavfilter/avfilter.c:73:1: Parameter `ref->buf->refcount`
  71. }
  72. 
  73. void avfilter_unref_buffer(AVFilterBufferRef *ref)
      ^
  74. {
  75.     if (!ref)

libavfilter/avfilter.c:77:11: Binary operation: ([0, +oo] - 1):unsigned32 by call to `avfilter_unref_buffer` 
  75.     if (!ref)
  76.         return;
  77.     if (!(--ref->buf->refcount))
                ^
  78.         ref->buf->free(ref->buf);
  79.     av_free(ref->video);

void avfilter_unref_buffer(AVFilterBufferRef *ref)
{
    if (!ref)
        return;
    if (!(--ref->buf->refcount))
        ref->buf->free(ref->buf);
    av_free(ref->video);
    av_free(ref->audio);
    av_free(ref);
}
['static void end_frame(AVFilterLink *inlink)\n{\n    AVFilterContext *ctx = inlink->dst;\n    int i;\n    for (i = 0; i < ctx->output_count; i++)\n        avfilter_end_frame(ctx->outputs[i]);\n    avfilter_unref_buffer(inlink->cur_buf);\n}', 'void avfilter_unref_buffer(AVFilterBufferRef *ref)\n{\n    if (!ref)\n        return;\n    if (!(--ref->buf->refcount))\n        ref->buf->free(ref->buf);\n    av_free(ref->video);\n    av_free(ref->audio);\n    av_free(ref);\n}']