Making a video out of powerpoint presentation

I wanted to convert the powerpoint presentation into a video file. After trying different things, I reached to the conclusion that the best way of doing it is by using the Camtasia software. The detailed methodology is given at following link:

http://www.awesomebackgrounds.com/powerpoint-to-video.htm#Capture

Some other things which I tried include:
1. Using Microsoft Producer:

• It does not support exporting a video file.
• Can be very useful, if someone simply wants to "publish" the powerpoint presentation on web.
• Freely available (dont be surprised, Microsoft does give few things for free) and can be downloaded from microsofts website.

2. Using PowerVideoMaker:

• Excellent software, but not freely available.
• Trial version shows an additional line(stating that the software is unregistered) on the video which makes it unsuitable for making presentable videos.
  

3. Using Powerpoint to Video convertor:

• Not as good as PowerVideoMaker.