let vinfo = NAVideoInfo::new(self.w, self.h, false, fmt);
let bufret = alloc_video_buffer(vinfo, 4);
if let Err(_) = bufret { return Err(DecoderError::InvalidData); }
let vinfo = NAVideoInfo::new(self.w, self.h, false, fmt);
let bufret = alloc_video_buffer(vinfo, 4);
if let Err(_) = bufret { return Err(DecoderError::InvalidData); }