To install the mplayer package, you need to have a functionnal wifi network connection on your Neo FreeRunner. This can be achieved by following the procedure from the Openmoko wiki to enable Wifi or USB networking.

The required packages for mplayer can be found in the Angstrom Repository. From a shell on the FreeRunner, type the following commands to enable the access to the repository:

> echo "arch base 50" > /etc/opkg/angstrom-feed.conf
> echo "src/gz base http://www.angstrom-distribution.org/feeds/2008/ipk/glibc/armv4t/base" >> /etc/opkg/angstrom-feed.conf

Then, install mplayer using the opkg tool:

> opkg update
> opkg install mplayer