A few months ago, I wrote a proof of concept that does this: https://github.com/deactivated/video-snapshot https://github.com/deactivated/video-snapshot. It see

A few months ago, I wrote a proof of concept that does this: https://github.com/deactivated/video-snapshot https://github.com/deactivated/video-snapshot. It seems to still work in Chrome 24. It depends on the HTML5 player and has a few other limitations, but it might be useful for anyone doing something similar.