avconv.c:173: error: Integer Overflow L1
  ([-oo, 0] - 1):unsigned32 by call to `avformat_free_context`.

avconv.c:163:9: Call
161.         }
162.         av_freep(&filtergraphs[i]->outputs);
163.         av_freep(&filtergraphs[i]->graph_desc);
             ^
164.         av_freep(&filtergraphs[i]);
165.     }

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

avconv.c:173:9: Call
171.         if (s && s->oformat && !(s->oformat->flags & AVFMT_NOFILE) && s->pb)
172.             avio_close(s->pb);
173.         avformat_free_context(s);
             ^
174.         av_dict_free(&output_files[i]->opts);
175.         av_freep(&output_files[i]);

libavformat/utils.c:2595:1: <LHS trace>
2593. }
2594. 
2595. void avformat_free_context(AVFormatContext *s)
      ^
2596. {
2597.     int i;

libavformat/utils.c:2595:1: Parameter `s->nb_chapters`
  2593. }
  2594. 
  2595. void avformat_free_context(AVFormatContext *s)
        ^
  2596. {
  2597.     int i;

libavformat/utils.c:2629:12: Binary operation: ([-oo, 0] - 1):unsigned32 by call to `avformat_free_context` 
  2627.     av_freep(&s->programs);
  2628.     av_freep(&s->priv_data);
  2629.     while (s->nb_chapters--) {
                   ^
  2630.         av_dict_free(&s->chapters[s->nb_chapters]->metadata);
  2631.         av_free(s->chapters[s->nb_chapters]);
