tokai released ogmtools, here the news from morphzone.org:
ogmtools allow information about, extraction from, creation or splitting of OGG media streams. OGM is used for "OGG media streams".
The archive contains:
This program takes the input from several media files and joins their streams (all of them or just a selection) into an OGM.
This program lists inforamtion about all streams contained in an OGM including information about the codecs used.
This program extracts all or only some data streams from an OGM and writes them to separate files.
This program can be used to easily split an OGM file after a given size. Several OGM files will be created that each start with a keyframe.
This program can be used to concatenate several OGG/OGM files into one big file if they are of the same type. Please note ogmcat is not fully working yet, since it's a work in progress version.
For more information read the included AmigaGuide or man documentation.
The MorphOS port can be downloaded from http://www.christianrosentreter.com/