libavformat/wav.c:334: error: Uninitialized Value
  The value read from umid_parts[_] was never initialized.

libavformat/wav.c:334:39: 
332.         if (umid_mask) {
333.             /* the string formatting below is per SMPTE 330M-2004 Annex C */
334.             if (umid_parts[4] == 0 && umid_parts[5] == 0 && umid_parts[6] == 0 && umid_parts[7] == 0) {
                                           ^
335.                 /* basic UMID */
336.                 snprintf(temp, sizeof(temp), "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
