Hi, recently I encoded an avi file, using mpeg4 codecs. I used 'mencoder' that came with mplayer. The process of encoding seemed to work out well, however, when I actually try to play that newly encoded file, I have got the error messages that: Try to upgrade /home/carl/.mplayer/codecs.conf from etc/codecs.conf *** If it still does not work, read DOCS/codecs.html! Cannot find codec matching selected -vo and video format 0x6F4E7246. I tried to upgrade /home/carl/.mplayer/codecs.conf by the following command: cd MPlayer-0.90 cp etc/codecs.conf /home/carl/.mplayer/codecs.conf Then I again tried to play that file, using mplayer. However I have got the very same message that I have got previously. Could anybody tell me what I can do? Thank you very much and have a good day.