Sorry :lol:
1. The GoPro setup only works with hero1 and 2 cams plus it would be too heavy to fly on a phantom I think as the hero2 cams are nearly twice the weight of a hero3 camera and the housing is heavier then the cameras. It does have the advantage of having a sync cable though and also you can easily work the footage with cineform using the pretty good tools for 3D.
2. Manually syncing frames as the cable doesnt work with the H3 cams, my sync method is pretty simple. I press both shutters at the same time this tends to get me within 1 or 2 frames sync wise, I tried the WiFi remote but it is pretty poor starting between 15 and 30 frames apart.
I then also shoot either my FPV video feed with gopro OSD on it and then sync to the frame where the time changes. I sometimes use the stopwatch function on my phone or simply get a torch and turn it on infront of the cams then sync to the frame where the light goes on. This will get me within the nearest frame, then for final sync I load both sides in premier pro and overlay the images. I align them as close as possible then go through them frame by frame to make sure motion is synced properly. Sometimes I may need to move them 1 frame forward or back to get the closest possible sync, at first I thought this was a fairly painful way of doing it but now I can get close to perfect sync and image alignment in premiere pro within a minute or so.
3. It should be possible as hero2 and hero3 silver are sharing most of the same internals, the main issue may be mounting them as the lenses have moved a little in the hero3's compared to hero2's which is why they dont fit in each others housings. Ideally you want 2 of the same cameras with the same lenses but though it may take more work in setup and post it should be possible assuming the lenses give the same image. If one is slightly more fish eyed then the other it really wont work and I haven't got any hero 1 or 2 cams on me atm to see how the images compare.
Editing them into 3D is a bit tricky if you do it manually like I do, I need to get both images overlayed and after syncing the frames I make the right video which is on the top layer 50% opaque. This lets me move it along inside premiere using the frame pivot points. I can move it vertically, horizontally or even rotate if needed and first I try and make sure they are lined up close to perfect. Then I move the right image a little to the right to add some 3d seperation, I didnt do this at the start but it makes the 3d effect a little too subtle if you have very little seperation. I then move both sides to the center of each frame and will need to zoom to ensure that they both fill the frame as I have moved the center of one side. Once they are both side by side and zoomed to fill the frame I will crop one side to make sure they join perfectly in the center of the frame.
Its possible to do this with different cams or FOV's if the lenses work in the same way so the fisheye distortion in gopro's must be the same on both sides. Here is an example lining up a 2.7k30 and 1440p30 clip using this method.
As can be seen they are quite different FOV's and so I had to move and zoom one side to match the other, this will take more time but is still doable. The easiest way to avoid extra work is to have matching cameras mounted as close to perfectly aligned as possible to give the least amount of work needed to align the 2 images. I did the an early experiment of my method using some old hero2 footage with some sharks that I shot using 6 hero 2's :lol: when doing some filter tests a while back. This I never intended to make into 3d and so the cams were only very roughly aligned but it was possible to get pretty decent frame sync still. They were a fair way out so I needed a fair bit of zoom and crop, also as the light was crap and quite deep the images weren't that great and the 2 sides don't match too well even after playing with them in post. Hero2 cams in deep water using auto white balance struggle quite a bit and unfortunately that was the main thing that came out of the filter tests as the weather and vis turned pretty crap for most of those dives.
[youtube]http://www.youtube.com/watch?v=izI-Q9mLbLk[/youtube]
I have an idea for hero3 cams to make the cameras very easy to align and have designed something with some friends making a prototype of it for me. This would help the lenses to be lined up perfectly each time so it will save time in post and also reduce cropping and zooming of the images as much as possible. Not sure if it will ever become a commercial product as its just something I am trying out seeing as GoPro never made a proper housing for the h3 in 3d. 3D is quite a niche and as editing it is not the easiest thing it would be a very niche product within a small niche. If cineform studio allowed easy ways of manually re syncing frames then editing would be 100 times easier then my current method. There are some plugins and other software that also does most of the work for you but once I figured out the manual method its worked good enough for me.