Record the timestamps of slide changes during a live Powerpoint presentation?

Question

I am planning to implement a lecture capture solution. One of the requirements is to record both the presenter and the slideshow. The presenter is recorded with a videocamera obviously, and the slideshow will probably be captured using a tool like Camtasia.

Now during playback three components are visible: the presenter, the slides and a table of contents. Clicking a chapter title in the TOC causes the video to navigate to the corresponding section. This means that a mapping must be made between chapter titles and their timestamps in the video.

Usually a change of topic is accompanied with a slide change in the Powerpoint presentation. So the timestamps could be deduced from the slidechanges. However, this requires me to detect slide changes during the live presentation. And I don't know how to do that.

Anyone here knows how to do detect slide changes? Is there a Powerpoint API where I can connect event handlers or something like that? I'd greatly appreciate your help!

Edit
This issue is no longer relevant for my current work so this question will not be updated by me. However, you are still free to help others by posting your answers/insights here.

Answer 1

It would be elegant to detect the slide changes, but wouldn't it be more practical to have the presenter to type a hotkey whenever there is a topic change? Or anything similar, but cooperating with the presenter, since he knows best when the topic changes.

Sorry not to provide an elegant answer.

Answer 2

"By opening the bounty, are you looking for the code to written for you? – Otaku"

Otaku, I would like to have code written for me that will timestamp the slidechanges so I can bring the data into Flash and synch it to an audio or video file. Can you or anyone on this forum write that for me?