libavfilter/af_amix.c:308: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned32 by call to `avfilter_unref_buffer`.

libavfilter/af_amix.c:302:17: Unknown value from: non-const function
300. 
301.             for (p = 0; p < planes; p++) {
302.                 s->fdsp.vector_fmac_scalar((float *)out_buf->extended_data[p],
                     ^
303.                                            (float *) in_buf->extended_data[p],
304.                                            s->input_scale[i], plane_size);

libavfilter/af_amix.c:308:5: Call
306.         }
307.     }
308.     avfilter_unref_buffer(in_buf);
         ^
309. 
310.     out_buf->pts = s->next_pts;

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

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

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