Mplayer画面比列设置问题

装了mplayer 但是画面比列不对 怎样才能自己设置呀
我的宽屏显示器 下边是我的 gui.conf
enable_audio_equ = "no"
vo_driver = "xv"
vo_panscan = "0.000000"
vo_doublebuffering = "yes"
vo_direct_render = "no"
v_framedrop = "0"
v_flip = "0"
v_ni = "no"
v_idx = "-1"
vf_pp = "no"
vf_autoq = "0"
vf_lavc = "no"
ao_volnorm = "no"
softvol = "no"
ao_surround = "no"
ao_extra_stereo = "no"
ao_extra_stereo_coefficient = "1.000000"
osd_level = "1"
sub_auto_load = "yes"
sub_unicode = "no"
sub_pos = "100"
sub_overlap = "no"
font_factor = "0.750000"
font_name = "/usr/local/share/mplayer/font/subfont.ttf"
font_text_scale = "5.000000"
font_osd_scale = "6.000000"
font_blur = "2.000000"
font_outline = "2.000000"
font_autoscale = "3"
cache = "no"
cache_size = "2048"
playbar = "yes"
load_fullscreen = "no"
show_videowin = "yes"
stopxscreensaver = "no"
autosync = "no"
autosync_size = "0"
gui_skin = "plastic"
gui_save_pos = "yes"
gui_main_pos_x = "571"
gui_main_pos_y = "639"
gui_video_out_pos_x = "420"
gui_video_out_pos_y = "300"

monitoraspect=16:10