在Red Hat Enterprise Linux 6下编译Mplayer过程很忐忑，特记录一下：
首先
# wget http://www1.mplayerhq.hu/MPlayer/releases/MPlayer-1.0rc4.tar.bz2
# tar -zxvf MPlayer-1.0rc4.tar.bz2
# ./configure
# make
出现错误：
libmpcodecs/vd_mpng.c: In function 'pngReadFN':
libmpcodecs/vd_mpng.c:77: error: dereferencing pointer to incomplete type
libmpcodecs/vd_mpng.c: In function 'decode':
libmpcodecs/vd_mpng.c:114: error: dereferencing pointer to incomplete type
libmpcodecs/vd_mpng.c:131: error: dereferencing pointer to incomplete type
make: *** [libmpcodecs/vd_mpng.o] 错误 1
搜索半天，终于在谷歌上得到解惑，百度有点不给力：
Bug 354965 – media-video-mplayer fails to compile against media-libs-libpng-1_5_x
竟然是一BUG，没办法，只能用最新版的了。
# svn checkout svn://svn.mplayerhq.hu/mplayer/trunk mplayer
# ./configure
又有错误提示
No FFmpeg checkout, press enter to download one with git or CTRL+C to abort
解决方案:
You may need to install git client and press enter during the above warning time
直接回车，自动安装git获取FFmpeg
# ./configure 没办法，再来一次configure
错误
Error: yasm not found, use --yasm='' if you really want to compile without
说明YASM没有找到
# git clone git://github.com/yasm/yasm.git
或
# wget http://www.tortall.net/projects/yasm/releases/yasm-1.1.0.tar.gz
安装 yasm 后重新进入mplayer下
# make -j 2
我的机器是E5300双核
# make install
成功
# svn update
# ldconfig
# mplayer --help
完毕！
# mencoder -of lavf -ovc lavc -lavcopts vcodec=flv:vbitrate=500 -lavfopts format=flv -srate 22050 -oac mp3lame -lavcopts acodec=mp3:abitrate=56 PrettyGirlWillGotMarried.mpg -o PrettyGirlWillGotMarried.flv -ofps 16
错误
MPlayer was compiled without libmp3lame support.
没安装lame
# wget http://sourceforge.net/projects/lame/files/lame/3.98.4/lame-3.98.4.tar.gz
# tar -zxvf lame-3.98.4.tar.gz
# cd lame-3.98.4
# ./configure --enable-shared
# make && make install
重新编译一遍Mplayer，成功
呵呵，压缩率50%