You don't have to understand the makefile, to use the video codec. It makes no sense to read the automatically generated makefile, then better learn autotools. It is very simple to use autotools for a simple project, but for bigger projects it's not that simple any more. They use autotools because these supposed to be very powerful tools, indeed they help to configure, but they are not that powerful, like they cannot be used for compiling kernel modules.

i am completely new for this area, i don't know what is autotool
please can you tell me the way should i follow.

I don't know, this maybe http://sourceware.org/autobook/autob...obook_toc.html But maybe someone knows something better.