libavcodec/vp8dsp.c:197: error: Uninitialized Value
  The value read from q0 was never initialized.

libavcodec/vp8dsp.c:197:16: 
195. {
196.     LOAD_PIXELS
197.     return 2 * FFABS(p0 - q0) + (FFABS(p1 - q1) >> 1) <= flim;
                    ^
198. }
199. 
