Though MPlayer supports XvMC acceleration, its port doesn't have an
option for enabling it.

Fix: Please apply following patch to multimedia/mplayer:



--
Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
ume@mahoroba.org  ume@{,jp.}FreeBSD.org
http://www.imasy.org/~ume/--t9aewr7leVZtmQLGvkT7KsIHwv0B0dp2571qpGVHhrU8IJZz
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Index: mplayer/Makefile
diff -u mplayer/Makefile.orig mplayer/Makefile
--- mplayer/Makefile.orig	2009-03-01 23:10:06.000000000 +0900
+++ mplayer/Makefile	2009-05-12 16:10:46.951063543 +0900
@@ -24,6 +24,7 @@
 OPTIONS+=	X11GL "X11 video drivers: OpenGL" on
 OPTIONS+=	X11XIN "X11 video drivers: Xinerama" on
 OPTIONS+=	X11VM "X11 VidMode support" on
+OPTIONS+=	X11XVMC "Enable XvMC acceleration" off
 OPTIONS+=	GUI "Enable GTK2 graphical user interface with X11" on
 OPTIONS+=	SDL "Enable SDL video output" off
 OPTIONS+=	VIDIX "Enable VIDIX video output on supported archs" on
@@ -150,6 +151,10 @@
 .else
 CONFIGURE_ARGS+=--disable-vm
 .endif
+.if defined(WITH_X11XVMC)
+USE_XORG+=	xvmc
+CONFIGURE_ARGS+=--enable-xvmc --with-xvmclib=XvMCW
+.endif
 .else				#WITHOUT_X11
 CONFIGURE_ARGS+=--disable-x11 \
 		--disable-fontconfig
How-To-Repeat: There is no `xvmc' in the output of `mplayer -vo help'.