This video is ReEncoded using next-generation video format/codec x265. it's one of the best and more advanced than current popular format x264. It also named HEVC which stands for High-Efficient Video Codec.
if you want to play this smoothly, you need to use a device/PC with at least dual-core processor.
You have to update your player to latest version. Also if you use your PC to watch it, installing LAV Filterwill help you a lot if you want to use KMPlayer or PotPlayer. Many players have native support for the codec, VLC media player, GOM Player, MPC-HC or PowerDVD 14.