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Now determine the keypresses by filming the vibrations of a potato chip bag[0]

[0]http://news.mit.edu/2014/algorithm-recovers-speech-from-vibr...

They manage to do it (just sound, not keypresses) with a 60fps DSLR camera at the end by examining the rows of the video - does this mean that for any videos already in existence, sound can be decoded from the images?

For any old 60fps homemovie of your potato chips: maybe.

Not for handheld videos.

Wouldn't you be able to filter out the camera motion, as long as the movement due to sound was fixed relative to something in frame?

I would say the motion blur and the rolling shutter effect would overpower the subtle vibrations due to audio.

Rolling shutter is exactly why this works.

Its not a complicated paper, give it a go.

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