mp3 on fc4

[Adel Essafi]

hi list
today, I have used yum for the first time :)
I have successfully downloaded amarok & xmms for FC4. But, mp3 dont work :(.
I tried to download xmms-mp3 and gstreamer-plugins-mp3 but I obtained 
theses messages.
what is wrong with this please
[root at localhost Adel]# yum install xmms-mp3
Setting up Install Process
Setting up repositories
gstreamer-deps            100% |=========================|  951 B    00:00
gstreamer                 100% |=========================|  951 B    00:00
extras                    100% |=========================| 1.1 kB    00:00
updates-released          100% |=========================|  951 B    00:00
base                      100% |=========================| 1.1 kB    00:00
primary.xml.gz            100% |=========================| 912 kB    01:18
extras    : ################################################## 2530/2530
Added 45 new packages, deleted 0 old in 13.11 seconds
primary.xml.gz            100% |=========================| 341 kB    00:26
updates-re: ################################################## 981/981
Added 13 new packages, deleted 24 old in 5.17 seconds
Parsing package install arguments
No Match for argument: xmms-mp3
Nothing to do
[root at localhost Adel]# yum install gstreamer-plugins-mp3
Setting up Install Process
Setting up repositories
gstreamer-deps            100% |=========================|  951 B    00:00
gstreamer                 100% |=========================|  951 B    00:00
extras                    100% |=========================| 1.1 kB    00:00
.................
Reading repository metadata in from local files
primary.xml.gz            100% |=========================| 896 kB    01:08
extras    : ################################################## 2485/2485
Added 0 new packages, deleted 45 old in 8.43 seconds
Parsing package install arguments
No Match for argument: gstreamer-plugins-mp3
Nothing to do


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