avconv.c:1988: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned32 by call to `avfilter_unref_buffer`.

avconv.c:1983:13: Call
1981.                 ost->st->codec->sample_aspect_ratio = picref->video->pixel_aspect;
1982. 
1983.             do_video_out(output_files[ost->file_index].ctx, ost, filtered_frame, &frame_size,
                  ^
1984.                          same_quant ? quality : ost->st->codec->global_quality);
1985.             if (vstats_filename && frame_size)

avconv.c:1387:13: Call
  1385.             pkt.flags |= AV_PKT_FLAG_KEY;
  1386. 
  1387.             write_frame(s, &pkt, ost);
                    ^
  1388.         } else {
  1389.             int got_packet;

avconv.c:1988:13: Call
1986.                 do_video_stats(output_files[ost->file_index].ctx, ost, frame_size);
1987.             frame_available = ost->output_video_filter && avfilter_poll_frame(ost->output_video_filter->inputs[0]);
1988.             avfilter_unref_buffer(picref);
                  ^
1989.         }
1990.     }

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);
