libavformat/wavdec.c:151: error: Uninitialized Value
  The value read from umid_parts[_] was never initialized.

libavformat/wavdec.c:151:39: 
149.         if (umid_mask) {
150.             /* the string formatting below is per SMPTE 330M-2004 Annex C */
151.             if (umid_parts[4] == 0 && umid_parts[5] == 0 &&
                                           ^
152.                 umid_parts[6] == 0 && umid_parts[7] == 0) {
153.                 /* basic UMID */
