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No one knows?
Well, it might be that no one knows what you're referring to. What is it you're trying to do?
In my mind, "keyframes" are user-created points on a timeline in video editing software. They're commonly used to control animations, effect parameters, and other things in the editing process. I own a GoPro and I've edited video from it many times, but I've never seen anything unusual in the raw video it produces, keyframes or otherwise.
The software I use most of the time is Sony Vegas Pro 9.
Haven't you noticed, when trying to edit a gopro video, that you cannot select the exact point where you want to cut it? The raw video will allow cutting just in certain points.