Problems installing mplayer

[Manish Chakravarty]

Hello all,
I have been a fan of Mplayer for a long time now.
However, i am facing problems installing mplayer in Ubuntu.
Whenever i select the package mplayer-custom in synapitc, it gives me
the following errors:
mplayer-custom:
 Depends: libavcodec2 but it is not going to be installed
 Depends: libpostproc0 but it is not going to be installed
 Depends: libxvidcore4 but it is not going to be installed

It also says"you are going to install software that can't be
autheticated". 
How do i install mplayer then?
Is it ok to download and compile the source myself? (Will it break
something?)
Please help
Manish Chakravarty

http://livejournal.com/~manish_chaks



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