From Fedora Project Wiki
Theora 1.1
Fedora 12 ships with an improved version of <package>libtheora</package>. This new version codenamed Thusnelda gives users better video quality while keeping the size of a video the same. --Needs More--
Volume Control
Following in the foot steps of Fedora 11 volume control now includes profile support, better input switching, and fade control. --Needs More--
GNOME
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KDE
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For more information refer to Multimedia.