cmdutils.c:871: error: Uninitialized Value
  The value read from type was never initialized.

cmdutils.c:871:13: 
869.         case 't': type = AVMEDIA_TYPE_ATTACHMENT; break;
870.         }
871.         if (type != st->codec->codec_type)
                 ^
872.             return 0;
873.         if (*spec++ == ':') {                                   /* possibly followed by :index */
