fn reconstruct_obmc(&mut self, buf: &mut NAVideoBuffer<u8>, slice_start: usize, start: usize, end: usize, slice_end: bool) -> usize {
let mut mb_x = start % self.mb_w;
let mut mb_y = start / self.mb_w;
fn reconstruct_obmc(&mut self, buf: &mut NAVideoBuffer<u8>, slice_start: usize, start: usize, end: usize, slice_end: bool) -> usize {
let mut mb_x = start % self.mb_w;
let mut mb_y = start / self.mb_w;