This indicates an attempt to exploit a remote Buffer Overflow vulnerability in MPlayer.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted "SAMI" file. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted "SAMI" file.
MPlayer SVN Versions before 33471
System Compromise: Remote code execution.
Refer to the vendor's web site for suggested workaround.