How are you sure this is an mplayer problem? Quoting directly from the output "It can be a bug in the MPlayer code _or_ in your drivers _or_ in your gcc version". Does downgrading to ubuntu3 fix the problem? Thanks.
** Changed in: mplayer (Ubuntu)
Status: Unconfirmed => Needs Info
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Crash when playing DVDs
https://launchpad.net/bugs/53883
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