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%