cmdutils.c:913: error: Uninitialized Value
  The value read from type was never initialized.

cmdutils.c:913:13: 
911.         case 't': type = AVMEDIA_TYPE_ATTACHMENT; break;
912.         }
913.         if (type != st->codec->codec_type)
                 ^
914.             return 0;
915.         if (*spec++ == ':') { /* possibly followed by :index */
