Spikecity, a long time YaBB developer and popular BoardMod mod writer, updated his YaBB Media Center Y2.x V1.9 to include support for additional media formats.  Here are Spikecity's comments:

New Version online attached to the first message (not the link to the database)

Now supporting Google Video, flv format, divx and xdiv and mp4 (depending on installed codex)

Note: This mod update is intended for YaBB 2.1.