I will try to make "how to" compile ffmpeg + x264 + mplayer + ffmpeg-php + mod_h264_streaming module for lighttpd from the source. It will be done under Debian 5 lenny stable x86 32bit version, it can be compiled under amd64 64bit as well but you need to skip steps related to the mplayers w32codecs (the w64codecs are almost empty so I don't see any point to include them on 64bit install).
1) Get some tools
sudo apt-get update sudo apt-get install svn git yasm libfaad-dev libvorbis-dev libbz2-dev libtheora-dev wget sudo apt-get build-dep mplayer
2) Get sources and set destination for the builds (as you can see now it's set to the /opt directory but it can point to yours home directory)
svn checkout svn://svn.ffmpeg.org/ffmpeg/trunk ffmpeg svn checkout svn://svn.mplayerhq.hu/mplayer/trunk mplayer git clone git://git.videolan.org/x264.git wget http://www.mplayerhq.hu/MPlayer/releases/codecs/essential-20071007.tar.bz2 wget http://lags.leetcode.net/Lagarith_1320.zip WHERE=/opt #WHERE=$HOME
3) Compile ffmpeg just with any config, just to get libavf compiled (x264 is dependand on it)
cd ffmpeg ./configure --extra-cflags=-I$WHERE/include --extra-ldflags=-L$WHERE/lib --prefix=$WHERE \ --enable-shared --enable-gpl --enable-libvorbis --enable-pthreads --enable-postproc --enable-x11grab \ --enable-swscale --enable-nonfree --disable-mmx --disable-stripping --enable-avfilter --disable-altivec \ --disable-armv5te --disable-armv6 --disable-vis make sudo make install
4) Set path for ldconfig
sudo sh -c "echo "$WHERE/lib" >> /etc/ld.so.conf.d/my_custom.conf" sudo ldconfig
5) Compile x264 and check if lavf support is enabled
cd ../x264 ./configure --prefix=$WHERE --enable-shared --extra-cflags=-I$WHERE/include \ --extra-ldflags=-L$WHERE/lib cat config.log | grep lavf: make sudo make install sudo ldconfig
6) Compile ffmpeg again with x264 support enabled
cd ../ffmpeg ./configure --extra-cflags=-I$WHERE/include --extra-ldflags=-L$WHERE/lib \ --prefix=$WHERE --enable-shared --enable-gpl --enable-libvorbis --enable-pthreads \ --enable-postproc --enable-x11grab --enable-swscale --enable-nonfree \ --disable-mmx --disable-stripping --enable-avfilter --disable-altivec --disable-armv5te \ --disable-armv6 --disable-vis --enable-libx264 make sudo make install sudo ldconfig cd ../
7) Get w32codecs ready for mplayer
tar jxvf essential-20071007.tar.bz2 sudo mkdir /usr/local/lib/codecs sudo cp essential-20071007/* /usr/local/lib/codecs/ copy Lagarith_1320.zip