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);
