[HLUG] MPlayer problem...

[Emon]

Hi all

I just joined the group.
I am a newbie running Slackware10.2.
Recently I installed the pkg "Mplayer-1.0pre7" but when I try to
play a video from my HDD It gives me the following error

*********
Fatal error!
Error opening/initializing the selected video_out (-vo) device.
*********

but "gxine" can play the video.

mp3s are not giving me any trouble though, they run fine on both
of them.

So... can anyone please tell me what is it that I am doing
wrong.

Thanks
Emon