let mut obmcbuf = NASimpleVideoFrame::from_video_buf(&mut self.obmc_buf).unwrap();
if let Some(ref srcbuf) = self.ipbs.get_lastref() {
let mut obmcbuf = NASimpleVideoFrame::from_video_buf(&mut self.obmc_buf).unwrap();
if let Some(ref srcbuf) = self.ipbs.get_lastref() {