Below we will install missing video and audio plugins such us MPEG-4, MP3 on Fedora linux. First enable free and nonfree package repository on your system RPMFusion on your system:
# yum localinstall --nogpgcheck http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-20.noarch.rpm
# yum localinstall --nogpgcheck http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-20.noarch.rpm
The above packages are for Fedora 21 Linux so check RPMFusion website to update the above links so they math your Fedora Linux system. Once you have run the above commands you need to update repository index:
# yum update
Once that is done run the below command to install following gstreamer video and audio plugins:
libnice-gstreamer1
gstreamer-plugins-good
gstreamer1-plugins-ugly
gstreamer1-plugins-good
gstreamer-plugins-bad-free-extras
gstreamer-plugins-espeak
gstreamer
gstreamer1
gstreamer1-plugins-base-tools
gstreamer1-plugins-bad-free-extras
gstreamer1-plugins-bad-freeworld
gstreamer-plugins-bad-free
gstreamer1-plugins-base
gstreamer1-plugins-good-extras
gstreamer-plugins-base
gstreamer-tools
PackageKit-gstreamer-plugin
gstreamer1-plugins-bad-free
Run the following linux command to install the above plugins:
# yum install libnice-gstreamer1 gstreamer-plugins-good gstreamer1-plugins-ugly gstreamer1-plugins-good gstreamer-plugins-bad-free-extras gstreamer-plugins-espeak gstreamer gstreamer1 gstreamer1-plugins-base-tools 
gstreamer1-plugins-bad-free-extras gstreamer1-plugins-bad-freeworld gstreamer-plugins-bad-free gstreamer1-plugins-base gstreamer1-plugins-good-extras gstreamer-plugins-base gstreamer-tools PackageKit-gstreamer-plugin gstreamer1-plugins-bad-free
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