libavcodec/vp3.c:809: error: Uninitialized Value
  The value read from motion_x[_] was never initialized.

libavcodec/vp3.c:809:25: 
807.                         s->motion_val[0][current_fragment][1] = motion_y[k];
808.                     } else {
809.                         s->motion_val[0][current_fragment][0] = motion_x[0];
                             ^
810.                         s->motion_val[0][current_fragment][1] = motion_y[0];
811.                     }
