avconv.c:4004: error: Buffer Overrun L1
  Offset: 1 Size: 1 by call to `check_stream_specifier`.

avconv.c:4001:9: Call
3999.         *val++ = 0;
4000. 
4001.         parse_meta_type(o->metadata[i].specifier, &type, &index, &stream_spec);
              ^
4002.         if (type == 's') {
4003.             for (j = 0; j < oc->nb_streams; j++) {

avconv.c:2947:1: Parameter `**stream_spec`
  2945.  * @param stream_spec for type s, the stream specifier is written here
  2946.  */
  2947. static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)
        ^
  2948. {
  2949.     if (*arg) {

avconv.c:4004:28: Call
4002.         if (type == 's') {
4003.             for (j = 0; j < oc->nb_streams; j++) {
4004.                 if ((ret = check_stream_specifier(oc, oc->streams[j], stream_spec)) > 0) {
                                 ^
4005.                     av_dict_set(&oc->streams[j]->metadata, o->metadata[i].u.str, *val ? val : NULL, 0);
4006.                 } else if (ret < 0)

cmdutils.c:898:1: <Length trace>
896. }
897. 
898. int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec)
     ^
899. {
900.     if (*spec <= '9' && *spec >= '0') /* opt:index */

cmdutils.c:898:1: Parameter `*spec`
  896. }
  897. 
  898. int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec)
       ^
  899. {
  900.     if (*spec <= '9' && *spec >= '0') /* opt:index */

cmdutils.c:906:18: Assignment
  904.         enum AVMediaType type;
  905. 
  906.         switch (*spec++) {
                        ^
  907.         case 'v': type = AVMEDIA_TYPE_VIDEO;      break;
  908.         case 'a': type = AVMEDIA_TYPE_AUDIO;      break;

cmdutils.c:915:13: Array access: Offset: 1 Size: 1 by call to `check_stream_specifier` 
  913.         if (type != st->codec->codec_type)
  914.             return 0;
  915.         if (*spec++ == ':') { /* possibly followed by :index */
                   ^
  916.             int i, index = strtol(spec, NULL, 0);
  917.             for (i = 0; i < s->nb_streams; i++)
