Well, it seems that N900 does not support ISO-8859-6 and ISO-8859-8. In the folder /usr/lib/gconv the corresponding libraries are missing. The viable alternative you have is to save the subtitles in UTF8, remove the /home/user/.mplayer/config file since mplayer has as default the UTF8 and retry.
Γεια σας παιδιά.. Την εντολή την πληκτρολογώ στο XTerminal όπως την βλέπω ακριβώς σε μια σειρά?
echo "subfont-encoding=ISO-8859-7" > /home/user/.mplayer/config
αφήνω τα κενά όπως τα βλέπω ή όχι? πχ.: echo(κενό)"subfont-....κτλ?? Eυχαριστώ εκ των προτέρων (((ο: