To cut a long story short, I am planing to do a road trip in the upcoming weeks of a long(er) road trip. The original idea was to use one of my GoPro Hero 3 cameras to take interval shots and then merge them to a video file later.
I have about 4 64GB sdcards, so memory shouldn't be an issue when setting the camera to shoot 7MP pictures (4-6MB in size). One of the drives will cover around 300km and take 4 hours. During this time, the camera will be plugged in to an external power supply so that won't be an issue either.
So the GoPro offers these interval modes:
0.5s / 1s / 2s / 5s
Originally, I planed to use 2s, but now doing some research, I figured that when driving you want the shortest interval available. Even so, taking a photo every 0.5 will still result in a relatively "choppy / jerky" video as these pictures will be taken with a relatively short exposure time, resulting in sharp photos without any blur.
Here's an example:
To make the video footage more appealing and smooth however, you do want to have blur. There is something called the 180° rule (or 180° shutter angle) which basically means that for a 24fps video, you'd want to have each photo within a 1 second interval exposed at 1/48th of a second. This gives you just the right amount of blur that we usually get to see in cinematic films etc and looks natural and pleasing.
The problem is, using a GoPro camera, I do not have control over the shutter speed.
So, any ideas how I can get it done using a GoPro camera? The easiest method would be probably to buy an ND filter for the GoPro Hero 3 (not sure I can get one on such short notice, given the GoPro Hero 3 isn't the most recent camera), but that would only induce longer exposures, not necessarily the right amount of exposure for the 180° rule. But perhaps any longer exposure would be better than no blur at all?
The other techniques I am looking into are to set my GoPro Hero 3 to video recording at 4k resolution at 15fps. This will give me roughly of 3 hour footage using a single 64GB card. I could then speed up the video in post to get the "timelapse video" in the duration I want it. This may yield a smoother result, than taking individual photos.
Alternatively, I could go with the 0.5s per picture interval and use some fancy image blending to create some blur in post. The problem is, I can't seem to figure out if this is possible and what it would look like. Blending perfectly sharp and still images would not create motion blur but just blur...
So, any ideas? Anyone try something like this? Or any technical minded input on how to achieve the desired result?
The problem is, by next week I'll be on that road trip and by then, I need a good idea on what route I'll be going with. Either I'll be filming in 4k at 15fps or I'll be taking thousands of pictures without knowing yet what might yield the best result...