Motion estimation -Bit rate

[new in imaging]

HI,

I am working on motion estimation algorithms.
For quality check, we depend on the PSNR and average number of search points.

Now i will also like to find that what happens on the bit rate of the encoder if i use my motion estimation technique .

So how i can do it? I have to put/embed Motion estimation algorithm in some video codec, can any one please guide a little so that i can jump start.
Thanks

[Mug Funky]

you could have a shot at hacking ffmpeg to do what you want.

it'd probably be a very big project though...