GOM Media Player comes equipped with all of the most popular video codecs (XviD, DivX, FLV1, OGG, MP4, H263 and more) by default, so downloading and installing extras is rarely necessary. For those videos that do require a separate codec, GOM Media Player will find one and direct you to a place where you can download an open source version. That way, you won't get stuck with unnecessary codecs on your system.
AVI files can't be played if the index is broken, or if the file isn't completely downloaded. This is because the index is located at the end of the file. GOM Media Player's advanced technology enables users to view files with broken indexes or that are still being downloaded.
GOM Media Player supports SMI, SRT, RT, and SUB(with IDX) subtitle formats. You can specify margin, location, size, resolution, font and others. You can also enable shadow, view ASF files with subtitle, karaoke subtitle mode. You can even synchronize subtitle and video if there's any mismatch.