libavcodec/interplayvideo.c:441: error: Uninitialized Value
  The value read from P[_] was never initialized.

libavcodec/interplayvideo.c:441:17: 
439. 
440.             for (x = 0; x < 4; x++, flags >>= 2)
441.                 *s->pixel_ptr++ = P[flags & 0x03];
                     ^
442. 
443.             if (vert) {
