In older tiki versions, it used to work with the File Gallery, wiki pages (via a plugin), and a new multimedia tracker item

• Multimedia support for Tiki began with File Gallery and image gallery. The support for multimedia audio and video became available in plugins circa Tiki2.
• In Tiki versions 2-4 multimedia support was limited to plugins PluginYoutube PluginGoogleVideo PluginFlash and PluginMediaPlayer
• As of Tiki4, Image galleries were phased out in favor of a combined File Gallery that supports all the media types.
• In Tiki5 integration with the video editing and sharing platform Kaltura was added.
• In Tiki6 PluginMediaPlayer was re-written to support more formats.

It uses the Multiplayer flash applet
http://ignu.ungi.com/tiki-index_raw.php?page=multiplayer

• Resizable applet
• Limited to playing 60 sec or 2 mn of a mp3 or FLV file
• No Flash server required, as the files are loaded from the specified url

See multimedia file types

Full doc in French:
http://fr.tiki.org/multimedia