GOM Player includes many codecs (XviD, DivX, FLV1, AC3, OGG, MP4, H263 and more) so you won`t need to install separate codecs for most videos. For those videos that require a separate codec, GOM Player will find one and direct you to a place where you can download open source version of the codec. That way, you won`t get stuck with unnecessary codecs on your system.