libavcodec/vp8dsp.c:211: error: Uninitialized Value
  The value read from p1 was never initialized.

libavcodec/vp8dsp.c:211:12: 
209.            FFABS(p3 - p2) <= I &&
210.            FFABS(p2 - p1) <= I &&
211.            FFABS(p1 - p0) <= I &&
                ^
212.            FFABS(q3 - q2) <= I &&
213.            FFABS(q2 - q1) <= I &&
