libavcodec/vp8dsp.c:169: error: Uninitialized Value
  The value read from q0 was never initialized.

libavcodec/vp8dsp.c:169:37: 
167. {
168.     LOAD_PIXELS
169.     return FFABS(p1-p0) > thresh || FFABS(q1-q0) > thresh;
                                         ^
170. }
171. 
