Fedora cannot include support for MP3 or DVD video playback or recording. MP3 formats are patented, and the patent holders have not provided the necessary licenses. Fedora also excludes other multimedia software due to patent, copyright, or license restrictions, such as Adobe Flash Player and RealNetworks RealPlayer.That doesn’t mean you can’t play .mp3 files in Fedora, it just takes a bit of work (not much).
Follow these instructions to get mp3 and other multimedia support on your Fedora 11.
Open a terminal and become root, then run this command:
rpm -Uvh http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm
rpm -Uvh http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm
rpm -Uvh http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm
Now, Install all other plug ins..
# yum -y install gstreamer-plugins-bad gstreamer-plugins-ugly xine-lib-extras-nonfree
After successful installation, open Amarok or any other multimedia player and try to play the mp3 file and see if all goes fine and you are able to hear the music.
XMMS
To install xmms and make it MP3-capable, start by doing this:
# yum install xmms xmms-mp3
MPEG, QuickTime, AVI, and DVDs
MPEG (the format used on DVDs) represents itself as an open standard, but most Linux distributions won't ship software that read it because of blocking patents held by MPEGLA. AVI and Apple QuickTime have proprietary codecs covered by patents, so most Linux distributions won't ship software that decodes them, either.
Unfortunately, the alternate front end xine is even more broken. It can be installed this way:
# yum install xine xine-lib libdvdcss
Doing this will also install a number of support libraries, including the libdvdcss plugin
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source:http://linuxpoison.blogspot.com/2009/06/135781757112308.html