이게 팁이 될런지 모르겠습니다.
 근데 자주 물어 보시는 분들이 계셔서 이렇게 올립니다.
 mplayer에서 화면 크기를 최대로 해도 화면은 커지지만 영화화면은 나오던
 크기 그대로 나오는 분들이 많을겁니다.
 영화 화면을 마우스를 쭉끌어서 늘여도 영화 화면은 그대로 인분들이 많을
 겁니다.
 이때는 ~/.mplayer/config의 옵션중에 vo=x11으로 그리고 zoom=yes를
 넣어 주시면 화면을 크게 늘리면 윈도우에서 처럼 풀화면크기로 볼수있습니다.
 마우스로 화면을 끌어 늘여도 끌어 당긴 만큼의 크기로 볼수 있습니다.
 vo=xv로 줬더니 풀화면시 화면 비율이 깨지면서 모니터 화면에 꽉차게 나오더
 군요 x11으로 옵션을 주시길......그리고 .mplayer/config를
  /etc/mplayer.conf로도 복사 해주시길..........
 이건 저의 설정 파일입니다.
 ---------------------------------------------------------------------
 vo=x11			# To specify default video driver (see
			# list)
 # ao=oss		# To specify default audio driver (see
			# list)
 fs=no			# Enlarges movie window to your desk
			# Used by drivers: all
 # vm=no			# Tries to change to a different vid
			# Used by drivers: dga2, x11, sdl
 # bpp=0			# Force changing display depth.
			# Valid settings are: 0, 15, 16, 24,
			# may need 'vm=yes' too.
			# Used by drivers: fbdev, dga2, svga,
  zoom=yes      # Enable software scaling (powerful CPU needed)
			# Used by drivers: svga, x11, vesa
 # double=yes		# use double-buffering (recommended fo
			# SUB/OSD usage)
 # monitoraspect=4:3	# standard monitor size, with square
# monitoraspect=16:9	# use this for widescreen monitor! no
 ##
## Use GUI mode by default
##
 #gui = yes
 ##
## Specify your preferred default skin here
## (skins are searched /usr/local/share/mplayer/Skin/yourskin
##  and ~/.mplayer/Skin/yourskin)
##
 skin = default
 ##
## Multiple languages are available 
##
## Hungarian	igen	nem
## English	yes	no
## German	ja	nein
## Spanish	si	no
## Binary	1	0
##
## You can also use spaces and/or tabs.
##
 # sound		= 1
# nosound	= nein
# mixer		= /dev/mixer
 ##
## resample the fonts' alphamap
## 0	plain white fonts
## 0.75	very narrow black outline (default)
## 1	narrow black outline
## 10	bold black outline
##
 # ffactor = 0.75
 ##
## FBdev driver:
 # fb = /dev/fb0		# framebuffer device to use
# fbmode = 640x480-120	# use this mode (read from fb.modes!)
# fbmodeconfig = /etc/fb.modes		# the fb.modes file
 ## VESA and FBdev driver: specify your monitor's timings
##
## (see for example /etc/X11/XF86Config for timings!)
## ** CAUTION! IF YOUR DISPLAY DOESN'T SUPPORT AUTOMATICALLY
##    OVERDRIVED (AND EVEN IF IT DOES), THIS MAY CAUSE DAMAGE
##    WE AREN'T RESPONSIBLE, IT'S YOUR DECISION! **
##
## k, K : means multiply by 1000
## m, M : means multiply by 1.000.000
##
# monitor_hfreq = 31.5k-50k,70k	# horizontal frequency range
# monitor_vfreq = 50-90		# vertical frequency range
# monitor_dotclock = 30M-300M	# dotclock (or pixelclock)
 ##
## SDL driver
##
 # vo = sdl:aalib	# use SDL video driver by default
			# use "vo = sdl:aalib" or "vo sdl:dga"
			# for specifying SDL subdrivers
# ao = sdl:esd		# use SDL audio driver by default
			# use "ao = sdl:esd" to use SDL's ESD
# noxv = no		# whether to use XVideo hardware acc
 # forcexv = yes		# force XVideo even if not detected
  ##
## Other (preferred to be default from configfile) switches
##
 #framedrop = yes# drop frames, when not in sync (slow CPU, vi
 cache		= 8192	# use 8Mb input cache by default
 # slang	= en	# DVD : display english subtitles if available
# alang	= en	# DVD : play english audio tracks if available
  ## This is the correct way to use "subconfig" type options in
## configuration file. In the command line you use :
## -aop list=resample:fout=44100 , but here it is :
# aop=list=resample:fout=44100
 ##
## You can also include other configfiles
## Specify full path!
##
## Delete this default 
##
unicode=1
#include=/home/gabucino/.mplayer/i_did_not_RTFM_carefully_enough...