libavcodec/vp8dsp.c:221: error: Uninitialized Value
  The value read from p0 was never initialized.

libavcodec/vp8dsp.c:221:12: 
219. {
220.     LOAD_PIXELS
221.     return FFABS(p1 - p0) > thresh || FFABS(q1 - q0) > thresh;
                ^
222. }
223. 
