let mut mp4muxer = Mp4Muxer::new(File::create("1.mp4").unwrap());
    let mut buf = Vec::new();
    File::open("1.264").unwrap().read_to_end(&mut buf).unwrap();
    mp4muxer.init_video(316, 342, false, "title");
    mp4muxer.write_video(&buf);
    mp4muxer.close();