Did you use Virtualbox to boot and then do the video "screengrab" ?
I don't know why anybody would need these previews.
- some people don't go to the cinema anymore and they need some kind of entertainment
- a friend of mine asked me, if I could do the videos and post them here
- after a beer or two one can see video clips in 3D when scrolling the page very fast [no need for new Sony 3D TV]
- one can learn how to use OpenShot
- one can learn how to export an .ogv file directly into an .avi mpeg2/HD 720 25fps file
- I had fun with making the videos