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Just in case someone does not remember the discussion around http://steady.stupeflix.com/ here https://news.ycombinator.com/item?id=8048413 I am posting the links. I came away really impressed by their page, couldnt try it out for the lack of a device. Would be eager to hear reactions about hyperlapse from those guys.

I wonder how troublesome it is to keep the gyro stream and the frame stream in sync.

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Hi srean ! One of the author of steady speaking. Hyperlapse tech looks like a lot Steady, because when you are using the same gyro data, you're quite bound to follow the same maths to compensate the camera shake. About the gyro stream / frame stream sync, it's very important to have it as precise as possible. We have seen that having just 1 ms of error in sync is already very visible to the naked eye. So you have to build a very accurate model of the timing of the CMOS and gyro sensors, taking into account exposure, rolling shutter, and sometimes software / hardware glitches in the lower technological stack.... Hope it give you some clues about that kind of tech !

Hi madlag thanks for your answer and wishing you all the best for steady. Wonder if a tap or something like that in the beginning can be used to synchronize, much like the clapper in movies. On the flipside that may not be good for usability.

You're welcome and thanks for the encouragement ! Actually, when you get the timings ok you don't need anymore some "runtime" adjustments, everything is fixed in advance. You just have to get the calibration data for every device, of course. By the way, as you said, you can use a clap to synchronize automatically two videos, using just the audio track, but that's another story ;-)

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