Multimedia codecs

Can we watch any multimedia content, using only standart Gnome players Totem and Rhythmbox?

Almost, little tricky with WMA and WMV. Packages provides this:

Main repo
gstreamer
gstreamer-tools
gstreamer-python
gstreamer-plugins-base
gstreamer-plugins-good
gstreamer-plugins-pulse
gstreamer-plugins-farsight
gstreamer-plugins-schroedinger

Multimedia repo (Livna, DAG, Multiverse)
gstreamer-ffmpeg
gstreamer-plugins-ugly
gstreamer-plugins-bad
gstreamer-plugins-bad-extras

Mplayer WM codecs
w32codecs
gstreamer-pitfdll