libavfilter/af_asyncts.c:220: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned32 by call to `ff_filter_frame`.

libavfilter/af_asyncts.c:214:9: Assignment
212. 
213.         avresample_read(s->avr, buf_out->extended_data, out_size);
214.         buf_out->pts = s->pts;
             ^
215. 
216.         if (delta > 0) {

libavfilter/af_asyncts.c:220:15: Call
218.                                    delta, nb_channels, buf->format);
219.         }
220.         ret = ff_filter_frame(outlink, buf_out);
                   ^
221.         if (ret < 0)
222.             goto fail;

libavfilter/avfilter.c:459:1: Parameter `frame->buf->refcount`
  457. }
  458. 
  459. int ff_filter_frame(AVFilterLink *link, AVFilterBufferRef *frame)
       ^
  460. {
  461.     int (*filter_frame)(AVFilterLink *, AVFilterBufferRef *);

libavfilter/avfilter.c:493:13: Call
  491.         }
  492.         if (!out) {
  493.             avfilter_unref_buffer(frame);
                   ^
  494.             return AVERROR(ENOMEM);
  495.         }

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

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

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