libavcodec/interplayvideo.c:761: error: Uninitialized Value
  The value read from P[_] was never initialized.

libavcodec/interplayvideo.c:761:17: 
759.         for (y = 0; y < 16; y++) {
760.             for (x = 0; x < 4; x++, flags >>= 2)
761.                 *pixel_ptr++ = P[flags & 0x03];
                     ^
762. 
763.             if (vert) {
