While on vacation with the Wife I took videos without snapping pictures at the same time. I was planning on taking pictures from the videos later and I can't figure it out. Now I'm wondering if it's possible.
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If you have a PC you can also use a media player there to grab still frames. My own favourite for that particular job - as well as my current media player of choice on PC in general - is PotPlayer, but many other media players also have more or less advanced frame grabbing options (last time I checked though the extremely popular VLC Player had rather lackluster features in that area).
The best ones for grabbing screenshots - that includes PotPlayer - let you skip back and forth one frame at a time for the optimal shot, as well as includes option to automatically export still frames at specified intervals (anywhere from milliseconds and up).
I have the solution you've been looking for! On Google play there's an amazing app called frame grabber. I think it was like 2 bucks and well worth it, as it works great on my galaxy nexus, sgs fascinate, droid x, and nook color with cm7. It should work on your s3 with no problem. Don't be afraid to spend the money, I guarantee you will love it.