avconv.c:2038: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned32 by call to `avfilter_unref_buffer`.

avconv.c:2031:13: Call
2029. #endif
2030. 
2031.             do_video_out(output_files[ost->file_index].ctx, ost, ist, filtered_frame, &frame_size,
                  ^
2032.                          same_quant ? quality : ost->st->codec->global_quality);
2033.             if (vstats_filename && frame_size)

avconv.c:1432:13: Call
  1430.             pkt.flags |= AV_PKT_FLAG_KEY;
  1431. 
  1432.             write_frame(s, &pkt, ost);
                    ^
  1433.         } else {
  1434.             int got_packet;

avconv.c:2038:17: Call
2036.             frame_available = ost->output_video_filter && avfilter_poll_frame(ost->output_video_filter->inputs[0]);
2037.             if (ost->picref)
2038.                 avfilter_unref_buffer(ost->picref);
                      ^
2039.         }
2040. #endif

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);
