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:87:1: <LHS trace>
85. }
86. 
87. void avfilter_unref_buffer(AVFilterBufferRef *ref)
    ^
88. {
89.     if (!ref)

libavfilter/avfilter.c:87:1: Parameter `ref->buf->refcount`
  85. }
  86. 
  87. void avfilter_unref_buffer(AVFilterBufferRef *ref)
      ^
  88. {
  89.     if (!ref)

libavfilter/avfilter.c:91:11: Binary operation: ([0, +oo] - 1):unsigned32 by call to `avfilter_unref_buffer` 
  89.     if (!ref)
  90.         return;
  91.     if (!(--ref->buf->refcount))
                ^
  92.         ref->buf->free(ref->buf);
  93.     if (ref->extended_data != ref->data)
