cmdutils.c:911: error: Uninitialized Value
  The value read from type was never initialized.

cmdutils.c:911:13: 
909.         default:  av_assert0(0);
910.         }
911.         if (type != st->codec->codec_type)
                 ^
912.             return 0;
913.         if (*spec++ == ':') { /* possibly followed by :index */
