OGM (OGG Movie)

Similar to AVI, OGG is container format. It can contain any number of streams, including audio, video, chaptering, subtitles, etc... OGM is the extension given to OGG containers that include an Audio/Video Stream (OGG Movie).

To Playback OGG Audio and OGM Video files, you need the OGM DirectShow filter.
There are three sets of filters. The Original filters which are a bit buggy, the Gabest filter which has better stability, but doesn't list track names and the Haali Media Splitter, which supports several wrapper formats (Matroska/MP4/MOV/OGM).

Also, a lot of OGM content contains Vorbis Audio, so make sure to download the Vorbis Audio decoder.

Download the Gabest Open Source OGM Splitter v1.0.0.0 (Windows XP/2000/2003/Vista):
Mirror 1, Mirror 2.
MD5: BFA4705BDAFF3B2D44B4634A1D95BB1C

Download the Gabest Open Source OGM Splitter v1.0.0.0 (Windows 95/98/ME):
Mirror 1, Mirror 2.
MD5: C8A9EA9A67F83332C7F3DDA17963FFD0