cmdutils.c:1507: error: Uninitialized Value
  The value read from type was never initialized.

cmdutils.c:1507:13: 
1505.         default:  av_assert0(0);
1506.         }
1507.         if (type != st->codecpar->codec_type)
                  ^
1508.             return 0;
1509.         if (*spec++ == ':') { /* possibly followed by :index */
