libavcodec/interplayvideo.c:836: error: Uninitialized Value
  The value read from P[_] was never initialized.

libavcodec/interplayvideo.c:836:17: 
834. 
835.             for (x = 0; x < 4; x++, flags >>= 2)
836.                 *pixel_ptr++ = P[flags & 0x03];
                     ^
837. 
838.             if (vert) {
