Dld both of them as you may need them: mplayer does not have a function to display subtitles (you have to do some crazy stuff prior to opening the files, something that you can change in VLC while playing back the file). On the other hand, VLC is a little more buggy and mplayer has a better image display.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-