libavcodec/motionpixels.c:268: error: Uninitialized Value
  The value read from p.y was never initialized.

libavcodec/motionpixels.c:268:13: 
266.             p = mp_get_yuv_from_rgb(mp, 0, y);
267.         } else {
268.             p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
                 ^
269.             if ((y & 3) == 0) {
270.                 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
