At first I should define, what is mod_rewrite?
mod_rewrite is a part of Apache server that can rewrite requested urls on the fly.

To enable mod_rewrite in Ubuntu, you just need to write this command in terminal

sudo a2enmod rewrite

This post will help you to install ffmpeg and compile it with some important codecs.

First, get your dependencies:

sudo apt-get build-dep ffmpeg
sudo apt-get install liblame-dev libfaad2-dev \
libfaac-dev libxvidcore4-dev liba52-0.7.4 \
liba52-0.7.4-dev libx264-dev checkinstall \
build-essential subversion

Next, grab the ffmpeg source:

svn checkout -r 8998 svn://svn.mplayerhq.hu/ffmpeg/trunk ffmpeg

If you’re feeling adventurous, you can try the very latest code by omitting the -r 8998 part of that line. Revision 8998 is the latest at the time of writing, and worked for me.

Now you can configure and build ffmpeg. This takes a little while:

cd ffmpeg
./configure --enable-gpl --enable-pp --enable-libvorbis \
--enable-libogg --enable-liba52 --enable-libdts \
--enable-dc1394 --enable-libgsm --disable-debug \
--enable-libmp3lame --enable-libfaad --enable-libfaac \
--enable-xvid --enable-pthreads --enable-x264
make

Finally, install it. checkinstall gives you the option to edit some parameters: I set the name to ffmpeg and the version to 3:0.svn20070511

sudo checkinstall