Haskell Blog

A video/slideshow hybrid about the fixed point combinator

Fri, 02 Jul 2010 15:13:12 +0200

Dear Haskellers,

thanks a lot for all your comments on my previous video! One comment in particular got me:

No offense but that was really slow-moving. It should not have been a video, it should have been a PDF presentation which I could have ripped through in a fraction of the runtime of the video.

Very honest and true. The big drawback of video as a medium is that the recipient is at the mercy of the speaker’s pace. In fact, I probably wouldn’t even watch my own video as it would feel too slow for me…

… No more! I hereby present a video/slideshow hybrid that explains the fixed point combinator in Haskell. It’s a series of slides you can rip through at your heart’s content, but when you press the “play” button, the corresponding narration will play as a video!

I have written a custom player in HTML 5 and JavaScript since current video formats don’t support this use case; the closest feature that I’ve come across is a “chapter track”, but that would still miss the written notes and you’d still have to wait to the video to fully load before being able to access the slides. (Keep in mind that you still have to wait for the video to load if you want to start the narration in the middle of the presentation…)

Comments

And as before, I want your comments. :-) Tell me about

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