Screen recording/capturing on change

Hi,

I have started to automate some GUI tests with AutoIt.
For this I need some tool to record/capture the screen only when there is some change (I just don't wont to have gigabytes of logs after over night test:))
Also need this logs to send to Dev team in case there was some issue.

I have already tried:

HyperCam.au3,
ScreenCapture.au3


However they can't do what I really want.
I was wondering if there is even such tool (free of course)?