Download the x264 video codec here. This is a well-known software tool. It is used to allow you to encode the H.264/MPEG-4 AVC video streams. You will also note that there is another standard being the H.265 encoder standard. These encoders will work in any of the media players on here such as Potplayer, MPV Player, MPC-BE, MPC-HC as well as the media player classic and KMPlayer.