avconv.c:169: error: Integer Overflow L1
  ([-oo, 0] - 1):unsigned32 by call to `avformat_free_context`.

avconv.c:159:9: Call
157.         }
158.         av_freep(&filtergraphs[i]->outputs);
159.         av_freep(&filtergraphs[i]->graph_desc);
             ^
160.         av_freep(&filtergraphs[i]);
161.     }

libavutil/mem.c:202:5: Assignment
  200.     void **ptr = (void **)arg;
  201.     av_free(*ptr);
  202.     *ptr = NULL;
           ^
  203. }
  204. 

avconv.c:169:9: Call
167.         if (s && s->oformat && !(s->oformat->flags & AVFMT_NOFILE) && s->pb)
168.             avio_close(s->pb);
169.         avformat_free_context(s);
             ^
170.         av_dict_free(&output_files[i]->opts);
171.         av_freep(&output_files[i]);

libavformat/utils.c:2596:1: <LHS trace>
2594. }
2595. 
2596. void avformat_free_context(AVFormatContext *s)
      ^
2597. {
2598.     int i, j;

libavformat/utils.c:2596:1: Parameter `s->nb_chapters`
  2594. }
  2595. 
  2596. void avformat_free_context(AVFormatContext *s)
        ^
  2597. {
  2598.     int i, j;

libavformat/utils.c:2636:12: Binary operation: ([-oo, 0] - 1):unsigned32 by call to `avformat_free_context` 
  2634.     av_freep(&s->programs);
  2635.     av_freep(&s->priv_data);
  2636.     while (s->nb_chapters--) {
                   ^
  2637.         av_dict_free(&s->chapters[s->nb_chapters]->metadata);
  2638.         av_free(s->chapters[s->nb_chapters]);
