cmdutils.c:805: error: Uninitialized Value
  The value read from type was never initialized.

cmdutils.c:805:13: 
803.         case 'd': type = AVMEDIA_TYPE_DATA;     break;
804.         }
805.         if (type != st->codec->codec_type)
                 ^
806.             return 0;
807.         if (*spec++ == ':') {                                   /* possibly followed by :index */
