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 an open source version of the codec. That way, you won't get stuck
with unnecessary codecs on your system.