the_oak, thank you very much, now I can play the MPEG file in landscape mode !!
for other 6000L user's reference, below are the steps that I do for my Z (under SharpRom) for playing the musics via Quasar Media Player:
1. Install mplayer-bvdd version 1.1.5-1 ([a href=\'index.php?act=findpost&pid=0\']http://atty.skr.jp/pub/zaurus/mplayer/mplayer-bvdd_1.1.5-1_arm.ipk[/a])
2. Install Quasar Media Player.
3. According to gab74's statement, creating fb.modes in /etc/, and it contains the following:
[div class=\'codetop\']CODE[/div][div class=\'codemain\' style=\'height:200px;white-space:pre;overflow:auto\']mode "qvga"
geometry 240 320 240 320 16
timings 1 2 3 4 5 6 7
endmode[/div]
4. According to the_oak's statement, creating mplayer.conf in /home/QtPalmtop/etc/mplayer, and it contains the following:
[div class=\'codetop\']CODE[/div][div class=\'codemain\' style=\'height:200px;white-space:pre;overflow:auto\']monitoraspect=4:3
#monitoraspect=16:9
#monitoraspect=3:4[/div]
5. According to the_oak's statement, within the Quasar program, click on "Tools" then "Configuration". On the MPlayer tab:
(1)Put a check in the box beside "Use additional options:", and put
"-vo fbdev -fbmode qvga -vm -vop rotate=1"
in the box
(2)Keep the box which below "Mplayer location" simply says "mplayer"
Thanks again, the-oak, you had made my dream come true
Further thanks to eviLjazz and gab74!!