For mplayer, you can specify your channel list like this (change australia to whatever):
Code:
mplayer tv:// -tv device=/dev/video0:chanlist=australia:channel=2
...then scroll up/down the channels with the "h" and "k" keys on the keyboard.
This will probably give you alot of unused channles, so you can specify what channels you want with the channels option (see man mplayer):
Code:
mplayer tv:// -tv device=/dev/video0:chanlist=australia:channel=2:channels=2-Two,7-Seven,9-Nine,10-Ten
good luck