LAV Filters is a free and open-source DirectShow filter pack that allows you to play popular video and audio formats on your computer. It supports various formats such as MPEG-2, MPEG-4, H.264, HEVC, VP9, and many more. It also has advanced features such as hardware acceleration, subtitle rendering, and multi-channel audio decoding. Additionally, LAV Filters is compatible with various media players such as MPC-HC, PotPlayer, and VLC.