1.you are getting this: Error opening/initializing the selected video_out (-vo)device error when you run mplayer , open terminal and run this command:

gmplayer -vo x11 -ao oss

and play your file. REMEMBER this only applies after installing mplayer and codecs.

2.I find many ubuntuers besides me meet this problem,hope this can help you.
Another question is mplayer can’t play a movie file by fullcreen, then you should edit ~/.mplayer/config and just add the line:

zoom=yes

3.Install w32codecs

• Ubuntu 6.06 “Dapper Drake”:

  sudo wget http://www.medibuntu.org/sources.list.d/dapper.list -O /etc/apt/sources.list.d/medibuntu.list

• Ubuntu 6.10 “Edgy Eft”:

  sudo wget http://www.medibuntu.org/sources.list.d/edgy.list -O /etc/apt/sources.list.d/medibuntu.list

• Ubuntu 7.04 “Feisty Fawn”:

  sudo wget http://www.medibuntu.org/sources.list.d/feisty.list -O /etc/apt/sources.list.d/medibuntu.list

• Ubuntu 7.10 “Gutsy Gibbon”:

  sudo wget http://www.medibuntu.org/sources.list.d/gutsy.list -O /etc/apt/sources.list.d/medibuntu.list

• Ubuntu 8.04 “Hardy Heron”:

  sudo wget http://www.medibuntu.org/sources.list.d/hardy.list -O /etc/apt/sources.list.d/medibuntu.list

Then, add the GPG Key:

sudo apt-get update && sudo apt-get install medibuntu-keyring && sudo apt-get update

final run:

sudo apt-get install w32codecs

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