Lecture Capture Implementation: Synced Video and Slides Side by Side

I would like to take a YouTube video of a lecture and sync it with another area displaying the (powerpoint/pdf) slides being discussed in the lecture.

For example, knoodle.com does this but for a price. I wonder if anyone has implemented something like that and what framework (Flash, HTML5, etc) they used.

Another good specific example can be found here. It shows exactly the kind of video-slide side-by-side visual I'm looking to creat开发者_StackOverflow中文版e.

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I'm the author of presentz.org.

Presentz is an opensource software that lets you mix youtube/vimeo/video files with slideshare/speakerdek/images.

It's also free to use.

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Try authorpoint software. It does that.

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onion.tv provides the functionality you are looking for and many others that can enrich video presentations and overall engagement with videos. It's hosted online - videos stays where they are e.g. at youtube and metadata stays at onion.tv