libavcodec/interplayvideo.c:754: error: Uninitialized Value
  The value read from P[_] was never initialized.

libavcodec/interplayvideo.c:754:18: 
752.         for (x = 4; x < 8; x++)
753.             P[x] = bytestream2_get_le16(&s->stream_ptr);
754.         vert = !(P[4] & 0x8000);
                      ^
755. 
756.         /* 4-color encoding for either left and right or top and bottom
